A computer based method of simulating or analyzing the behavior of structures or components.
A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.
The force applied by the masticatory muscles in dental occlusion.
Three-dimensional representation to show anatomic structures. Models may be used in place of intact animals or organisms for teaching, practice, and study.
The properties, processes, and behavior of biological systems under the action of mechanical forces.
Numerical expression indicating the measure of stiffness in a material. It is defined by the ratio of stress in a unit area of substance to the resulting deformation (strain). This allows the behavior of a material under load (such as bone) to be calculated.
The plan and delineation of dental prostheses in general or a specific dental prosthesis. It does not include DENTURE DESIGN. The framework usually consists of metal.
The description and measurement of the various factors that produce physical stress upon dental restorations, prostheses, or appliances, materials associated with them, or the natural oral structures.
Computer-based representation of physical systems and phenomena such as chemical processes.
The physical state of supporting an applied load. This often refers to the weight-bearing bones or joints that support the body's weight, especially those in the spine, hip, knee, and foot.
Natural teeth or teeth roots used as anchorage for a fixed or removable denture or other prosthesis (such as an implant) serving the same purpose.
The maximum compression a material can withstand without failure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p427)
The plan and delineation of DENTAL IMPLANT fitting with DENTAL ABUTMENT.
Removable prosthesis constructed over natural teeth or implanted studs.
The act and process of chewing and grinding food in the mouth.
Resistance and recovery from distortion of shape.
A tooth from which the dental pulp has been removed or is necrotic. (Boucher, Clinical Dental Terminology, 4th ed)
The plan, delineation, and location of actual structural elements of dentures. The design can relate to retainers, stress-breakers, occlusal rests, flanges, framework, lingual or palatal bars, reciprocal arms, etc.
Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.
Use of a metal casting, usually with a post in the pulp or root canal, designed to support and retain an artificial crown.
The thickest and spongiest part of the maxilla and mandible hollowed out into deep cavities for the teeth.
The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)
The use of computers for designing and/or manufacturing of anything, including drugs, surgical procedures, orthotics, and prosthetics.
The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.
The fibrous CONNECTIVE TISSUE surrounding the TOOTH ROOT, separating it from and attaching it to the alveolar bone (ALVEOLAR PROCESS).
The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.
The retention of a denture in place by design, device, or adhesion.
A type of porcelain used in dental restorations, either jacket crowns or inlays, artificial teeth, or metal-ceramic crowns. It is essentially a mixture of particles of feldspar and quartz, the feldspar melting first and providing a glass matrix for the quartz. Dental porcelain is produced by mixing ceramic powder (a mixture of quartz, kaolin, pigments, opacifiers, a suitable flux, and other substances) with distilled water. (From Jablonski's Dictionary of Dentistry, 1992)
The largest and strongest bone of the FACE constituting the lower jaw. It supports the lower teeth.
A prosthetic restoration that reproduces the entire surface anatomy of the visible natural crown of a tooth. It may be partial (covering three or more surfaces of a tooth) or complete (covering all surfaces). It is made of gold or other metal, porcelain, or resin.
Biocompatible materials placed into (endosseous) or onto (subperiosteal) the jawbone to support a crown, bridge, or artificial tooth, or to stabilize a diseased tooth.
The part of a tooth from the neck to the apex, embedded in the alveolar process and covered with cementum. A root may be single or divided into several branches, usually identified by their relative position, e.g., lingual root or buccal root. Single-rooted teeth include mandibular first and second premolars and the maxillary second premolar teeth. The maxillary first premolar has two roots in most cases. Maxillary molars have three roots. (Jablonski, Dictionary of Dentistry, 1992, p690)
The SKELETON of the HEAD including the FACIAL BONES and the bones enclosing the BRAIN.
Endosseous dental implantation where implants are fitted with an abutment or where an implant with a transmucosal coronal portion is used immediately (within 1 week) after the initial extraction. Conventionally, the implantation is performed in two stages with more than two months in between the stages.
The quality or state of being able to be bent or creased repeatedly. (From Webster, 3d ed)
A narrow passageway that connects the upper part of the throat to the TYMPANIC CAVITY.
A partial denture designed and constructed to be removed readily from the mouth.
Materials used in the production of dental bases, restorations, impressions, prostheses, etc.
Muscles arising in the zygomatic arch that close the jaw. Their nerve supply is masseteric from the mandibular division of the trigeminal nerve. (From Stedman, 25th ed)
Theoretical representations that simulate the behavior or activity of the cardiovascular system, processes, or phenomena; includes the use of mathematical equations, computers and other electronic equipment.
One of a pair of irregularly shaped bones that form the upper jaw. A maxillary bone provides tooth sockets for the superior teeth, forms part of the ORBIT, and contains the MAXILLARY SINUS.
A partial denture attached to prepared natural teeth, roots, or implants by cementation.
Alloys that contain a high percentage of gold. They are used in restorative or prosthetic dentistry.
The evaluation of incidents involving the loss of function of a device. These evaluations are used for a variety of purposes such as to determine the failure rates, the causes of failures, costs of failures, and the reliability and maintainability of devices.
A prosthesis that gains its support, stability, and retention from a substructure that is implanted under the soft tissues of the basal seat of the device and is in contact with bone. (From Boucher's Clinical Dental Terminology, 4th ed)
The longest and largest bone of the skeleton, it is situated between the hip and the knee.
Metal devices for fastening together two or more parts of dental prostheses for stabilizing or retaining them by attachment to abutment teeth. For a precision attachment for a partial denture DENTURE PRECISION ATTACHMENT is available.
The properties and processes of materials that affect their behavior under force.
General name for two extinct orders of reptiles from the Mesozoic era: Saurischia and Ornithischia.
X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.
The comparative study of animal structure with regard to homologous organs or parts. (Stedman, 25th ed)
Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.
Inability or inadequacy of a dental restoration or prosthesis to perform as expected.
Synthetic resins, containing an inert filler, that are widely used in dentistry.
The internal resistance of a material to moving some parts of it parallel to a fixed plane, in contrast to stretching (TENSILE STRENGTH) or compression (COMPRESSIVE STRENGTH). Ionic crystals are brittle because, when subjected to shear, ions of the same charge are brought next to each other, which causes repulsion.
The hard portion of the tooth surrounding the pulp, covered by enamel on the crown and cementum on the root, which is harder and denser than bone but softer than enamel, and is thus readily abraded when left unprotected. (From Jablonski, Dictionary of Dentistry, 1992)
A commonly used prosthesis that results in a strong, permanent restoration. It consists of an electrolytically etched cast-metal retainer that is cemented (bonded), using resins, to adjacent teeth whose enamel was previously acid-treated (acid-etched). This type of bridgework is sometimes referred to as a Maryland bridge.
A dark-gray, metallic element of widespread distribution but occurring in small amounts; atomic number, 22; atomic weight, 47.90; symbol, Ti; specific gravity, 4.5; used for fixation of fractures. (Dorland, 28th ed)
An inward slant of the thigh in which the knees are close together and the ankles far apart. Genu valgum can develop due to skeletal and joint dysplasias (e.g., OSTEOARTHRITIS; HURLER SYNDROME); and malnutrition (e.g., RICKETS; FLUORIDE POISONING).
Any of the eight frontal teeth (four maxillary and four mandibular) having a sharp incisal edge for cutting food and a single root, which occurs in man both as a deciduous and a permanent tooth. (Jablonski, Dictionary of Dentistry, 1992, p820)
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
Any of the 23 plates of fibrocartilage found between the bodies of adjacent VERTEBRAE.
VERTEBRAE in the region of the lower BACK below the THORACIC VERTEBRAE and above the SACRAL VERTEBRAE.
The selected form given to a natural tooth when it is reduced by instrumentation to receive a prosthesis (e.g., artificial crown or a retainer for a fixed or removable prosthesis). The selection of the form is guided by clinical circumstances and physical properties of the materials that make up the prosthesis. (Boucher's Clinical Dental Terminology, 4th ed, p239)
One of the eight permanent teeth, two on either side in each jaw, between the canines (CUSPID) and the molars (MOLAR), serving for grinding and crushing food. The upper have two cusps (bicuspid) but the lower have one to three. (Jablonski, Dictionary of Dentistry, 1992, p822)
The spinal or vertebral column.
The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821)
Restorations of metal, porcelain, or plastic made to fit a cavity preparation, then cemented into the tooth. Onlays are restorations which fit into cavity preparations and overlay the occlusal surface of a tooth or teeth. Onlays are retained by frictional or mechanical factors.
Bones that constitute each half of the pelvic girdle in VERTEBRATES, formed by fusion of the ILIUM; ISCHIUM; and PUBIC BONE.
A test to determine the relative hardness of a metal, mineral, or other material according to one of several scales, such as Brinell, Mohs, Rockwell, Vickers, or Shore. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A dead body, usually a human body.
The mechanical property of material that determines its resistance to force. HARDNESS TESTS measure this property.
The mouth, teeth, jaws, pharynx, and related structures as they relate to mastication, deglutition, and speech.
Sagittal sectioning and repositioning of the ramus of the MANDIBLE to correct a mandibular retrusion, MALOCCLUSION, ANGLE CLASS III; and PROGNATHISM. The oblique sectioning line consists of multiple cuts horizontal and vertical to the mandibular ramus.
One of a set of bone-like structures in the mouth used for biting and chewing.
Orthodontic techniques used to correct the malposition of a single tooth.
Artificial substitutes for body parts, and materials inserted into tissue for functional, cosmetic, or therapeutic purposes. Prostheses can be functional, as in the case of artificial arms and legs, or cosmetic, as in the case of an artificial eye. Implants, all surgically inserted or grafted into the body, tend to be used therapeutically. IMPLANTS, EXPERIMENTAL is available for those used experimentally.
An articulation between the condyle of the mandible and the articular tubercle of the temporal bone.
Substances used to bond COMPOSITE RESINS to DENTAL ENAMEL and DENTIN. These bonding or luting agents are used in restorative dentistry, ROOT CANAL THERAPY; PROSTHODONTICS; and ORTHODONTICS.
Descriptive anatomy based on three-dimensional imaging (IMAGING, THREE-DIMENSIONAL) of the body, organs, and structures using a series of computer multiplane sections, displayed by transverse, coronal, and sagittal analyses. It is essential to accurate interpretation by the radiologist of such techniques as ultrasonic diagnosis, MAGNETIC RESONANCE IMAGING, and computed tomography (TOMOGRAPHY, X-RAY COMPUTED). (From Lane & Sharfaei, Modern Sectional Anatomy, 1992, Preface)
Specialized devices used in ORTHOPEDIC SURGERY to repair bone fractures.
Methods of creating machines and devices.
Presentation devices used for patient education and technique training in dentistry.
A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions for use in restorative or prosthetic dentistry.
Characteristics or attributes of the outer boundaries of objects, including molecules.
Theoretical representations that simulate the behavior or activity of systems, processes, or phenomena. They include the use of mathematical equations, computers, and other electronic equipment.
The growth action of bone tissue as it assimilates surgically implanted devices or prostheses to be used as either replacement parts (e.g., hip) or as anchors (e.g., endosseous dental implants).
Adhesives used to fix prosthetic devices to bones and to cement bone to bone in difficult fractures. Synthetic resins are commonly used as cements. A mixture of monocalcium phosphate, monohydrate, alpha-tricalcium phosphate, and calcium carbonate with a sodium phosphate solution is also a useful bone paste.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Implantable fracture fixation devices attached to bone fragments with screws to bridge the fracture gap and shield the fracture site from stress as bone heals. (UMDNS, 1999)
The relationship of all the components of the masticatory system in normal function. It has special reference to the position and contact of the maxillary and mandibular teeth for the highest efficiency during the excursive movements of the jaw that are essential for mastication. (From Jablonski, Dictionary of Dentistry, 1992, p556, p472)
The study of systems which respond disproportionately (nonlinearly) to initial conditions or perturbing stimuli. Nonlinear systems may exhibit "chaos" which is classically characterized as sensitive dependence on initial conditions. Chaotic systems, while distinguished from more ordered periodic systems, are not random. When their behavior over time is appropriately displayed (in "phase space"), constraints are evident which are described by "strange attractors". Phase space representations of chaotic systems, or strange attractors, usually reveal fractal (FRACTALS) self-similarity across time scales. Natural, including biological, systems often display nonlinear dynamics and chaos.
Either of two fleshy protuberances at the lower posterior section of the trunk or HIP in humans and primate on which a person or animal sits, consisting of gluteal MUSCLES and fat.
The third tooth to the left and to the right of the midline of either jaw, situated between the second INCISOR and the premolar teeth (BICUSPID). (Jablonski, Dictionary of Dentistry, 1992, p817)
The second longest bone of the skeleton. It is located on the medial side of the lower leg, articulating with the FIBULA laterally, the TALUS distally, and the FEMUR proximally.
A physical property showing different values in relation to the direction in or along which the measurement is made. The physical property may be with regard to thermal or electric conductivity or light refraction. In crystallography, it describes crystals whose index of refraction varies with the direction of the incident light. It is also called acolotropy and colotropy. The opposite of anisotropy is isotropy wherein the same values characterize the object when measured along axes in all directions.
Bony structure of the mouth that holds the teeth. It consists of the MANDIBLE and the MAXILLA.
The plan and delineation of prostheses in general or a specific prosthesis.
Either of a pair of bones that form the prominent part of the CHEEK and contribute to the ORBIT on each side of the SKULL.
A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principle cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX.
Condition of having pores or open spaces. This often refers to bones, bone implants, or bone cements, but can refer to the porous state of any solid substance.
The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS.
Any device or element which converts an input signal into an output signal of a different form. Examples include the microphone, phonographic pickup, loudspeaker, barometer, photoelectric cell, automobile horn, doorbell, and underwater sound transducer. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)
Broken bones in the vertebral column.
Discrete segments of DNA which can excise and reintegrate to another site in the genome. Most are inactive, i.e., have not been found to exist outside the integrated state. DNA transposable elements include bacterial IS (insertion sequence) elements, Tn elements, the maize controlling elements Ac and Ds, Drosophila P, gypsy, and pogo elements, the human Tigger elements and the Tc and mariner elements which are found throughout the animal kingdom.
A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The distance and direction to which a bone joint can be extended. Range of motion is a function of the condition of the joints, muscles, and connective tissues involved. Joint flexibility can be improved through appropriate MUSCLE STRETCHING EXERCISES.
The behaviors of materials under force.
The tearing or bursting of the wall along any portion of the AORTA, such as thoracic or abdominal. It may result from the rupture of an aneurysm or it may be due to TRAUMA.
An adhesion procedure for orthodontic attachments, such as plastic DENTAL CROWNS. This process usually includes the application of an adhesive material (DENTAL CEMENTS) and letting it harden in-place by light or chemical curing.
Dental cements composed either of polymethyl methacrylate or dimethacrylate, produced by mixing an acrylic monomer liquid with acrylic polymers and mineral fillers. The cement is insoluble in water and is thus resistant to fluids in the mouth, but is also irritating to the dental pulp. It is used chiefly as a luting agent for fabricated and temporary restorations. (Jablonski's Dictionary of Dentistry, 1992, p159)
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
The part of the pelvis that comprises the pelvic socket where the head of FEMUR joins to form HIP JOINT (acetabulofemoral joint).
Nucleotide sequences, usually upstream, which are recognized by specific regulatory transcription factors, thereby causing gene response to various regulatory agents. These elements may be found in both promoter and enhancer regions.
The continuous turnover of BONE MATRIX and mineral that involves first an increase in BONE RESORPTION (osteoclastic activity) and later, reactive BONE FORMATION (osteoblastic activity). The process of bone remodeling takes place in the adult skeleton at discrete foci. The process ensures the mechanical integrity of the skeleton throughout life and plays an important role in calcium HOMEOSTASIS. An imbalance in the regulation of bone remodeling's two contrasting events, bone resorption and bone formation, results in many of the metabolic bone diseases, such as OSTEOPOROSIS.

Balloon-artery interactions during stent placement: a finite element analysis approach to pressure, compliance, and stent design as contributors to vascular injury. (1/1327)

Endovascular stents expand the arterial lumen more than balloon angioplasty and reduce rates of restenosis after coronary angioplasty in selected patients. Understanding the factors involved in vascular injury imposed during stent deployment may allow optimization of stent design and stent-placement protocols so as to limit vascular injury and perhaps reduce restenosis. Addressing the hypothesis that a previously undescribed mechanism of vascular injury during stent deployment is balloon-artery interaction, we have used finite element analysis to model how balloon-artery contact stress and area depend on stent-strut geometry, balloon compliance, and inflation pressure. We also examined superficial injury during deployment of stents of varied design in vivo and in a phantom model ex vivo to show that balloon-induced damage can be modulated by altering stent design. Our results show that higher inflation pressures, wider stent-strut openings, and more compliant balloon materials cause markedly larger surface-contact areas and contact stresses between stent struts. Appreciating that the contact stress and contact area are functions of placement pressure, stent geometry, and balloon compliance may help direct development of novel stent designs and stent-deployment protocols so as to minimize vascular injury during stenting and perhaps to optimize long-term outcomes.  (+info)

Diffusion tensor imaging in biomechanical studies of skeletal muscle function. (2/1327)

In numerical simulations of skeletal muscle contractions, geometric information is of major importance. The aim of the present study was to determine whether the diffusion tensor imaging (DTI) technique is suitable to obtain valid input with regard to skeletal muscle fibre direction. The accuracy of the DTI method was therefore studied by comparison of DTI fibre directions in the rat tibialis anterior muscle with fascicle striation patterns visible on high-resolution magnetic resonance imaging (MRI) and with fibre directions in an actual longitudinal section (ALS) through the same muscle. The results showed an excellent qualitative agreement between high-resolution MRI and DTI. Despite less accurate quantitative comparison with ALS, it was concluded that DTI does indeed measure skeletal muscle fibre direction. After the experiment, it was possible to determine an appropriate voxel size (0.9 mm3) that provided enough resolution and acceptable accuracy (5 degrees) to use DTI fibre directions in biomechanical analyses. Muscle deformation during contraction, resulting from a finite element simulation with a mesh that was directly generated from the experimental data, has been presented.  (+info)

Red cell distribution and the recruitment of pulmonary diffusing capacity. (3/1327)

The distribution of red blood cells in alveolar capillaries is typically nonuniform, as shown by intravital microscopy and in alveolar tissue fixed in situ. To determine the effects of red cell distribution on pulmonary diffusive gas transport, we computed the uptake of CO across a two-dimensional geometric capillary model containing a variable number of red blood cells. Red blood cells are spaced uniformly, randomly, or clustered without overlap within the capillary. Total CO diffusing capacity (DLCO) and membrane diffusing capacity (DmCO) are calculated by a finite-element method. Results show that distribution of red blood cells at a fixed hematocrit greatly affects capillary CO uptake. At any given average capillary red cell density, the uniform distribution of red blood cells yields the highest DmCO and DLCO, whereas the clustered distribution yields the lowest values. Random nonuniform distribution of red blood cells within a single capillary segment reduces diffusive CO uptake by up to 30%. Nonuniform distribution of red blood cells among separate capillary segments can reduce diffusive CO uptake by >50%. This analysis demonstrates that pulmonary microvascular recruitment for gas exchange does not depend solely on the number of patent capillaries or the hematocrit; simple redistribution of red blood cells within capillaries can potentially account for 50% of the observed physiological recruitment of DLCO from rest to exercise.  (+info)

Simulation model of an eyeball based on finite element analysis on a supercomputer. (4/1327)

BACKGROUND/AIMS: A simulation model of the human eye was developed. It was applied to the determination of the physical and mechanical conditions of impacting foreign bodies causing intraocular foreign body (IOFB) injuries. METHODS: Modules of the Hypermesh (Altair Engineering, Tokyo, Japan) were used for solid modelling, geometric construction, and finite element mesh creation based on information obtained from cadaver eyes. The simulations were solved by a supercomputer using the finite element analysis (FEA) program PAM-CRASH (Nihon ESI, Tokyo, Japan). It was assumed that rupture occurs at a strain of 18.0% in the cornea and 6.8% in the sclera and at a stress of 9.4 MPa for both cornea and sclera. Blunt-shaped missiles were shot and set to impact on the surface of the cornea or sclera at velocities of 30 and 60 m/s, respectively. RESULTS: According to the simulation, the sizes of missile above which corneal rupture occurred at velocities of 30 and 60 m/s were 1.95 and 0.82 mm. The missile sizes causing scleral rupture were 0.95 and 0.75 mm at velocities of 30 and 60 m/s. CONCLUSIONS: These results suggest that this FEA model has potential usefulness as a simulation tool for ocular injury and it may provide useful information for developing protective measures against industrial and traffic ocular injuries.  (+info)

Abductor weakness and stresses around acetabular components of total hip arthroplasty: a finite element analysis. (5/1327)

Abductor weakness, and the resulting Trendelenburg gait, after total hip arthroplasty is believed to be associated with a poor long-term outcome. We have constructed a two-dimensional finite element analysis using load cases to mimic this abductor weakness. The finite element analysis demonstrates slightly increased stresses, particularly at the bone-cement interface in the DeLee-Charnley zone I, which does not seem sufficient to explain the adverse effect of abductor weakness.  (+info)

Determination of the centre of resistance in an upper human canine and idealized tooth model. (6/1327)

The purpose of this investigation was to analyse the influence of geometric and material parameters of a human canine on initial tooth mobility, and the stress and strain profiles in the periodontal ligament. While the material parameters of tooth and bony structures are known within an uncertain limit of approximately a factor of 10, values reported for the elasticity parameters of the periodontal ligament differ significantly. In the course of this study, bilinear behaviour was assumed for the mechanical property of the periodontium. The finite element model of an elliptical paraboloid was created as an approximation to the geometry of a human canine to reduce calculation time and to determine influences of the geometry on numerical results. The results were compared with those obtained for a realistic human canine model. The root length of both models was 19.5 mm. By calculating pure rotational and pure tipping movements, the centre of resistance (CR) was determined for both models. They were located on the long axis of the tooth approximately 7.2 mm below the alveolar crest for the idealized model and 8.2 mm for the canine model. Thus, the centre of resistance of a human canine seems to be located around two-fifths of the root length from the alveolar margin. Using these results, uncontrolled tipping (1 N of mesializing force and 5 Nmm of derotating momentum), as well as pure translation (additionally about 10 Nmm of uprighting momentum) were calculated. Comparing the idealized and the realistic models, the uncontrolled tipping was described by the parabolic-shaped model within an accuracy limit of 10 per cent as compared with the canine model, whereas the results for bodily movement differed significantly showing that it is very difficult to achieve a pure translation with the realistic canine model.  (+info)

Wall stress distribution on three-dimensionally reconstructed models of human abdominal aortic aneurysm. (7/1327)

PURPOSE: Abdominal aortic aneurysm (AAA) rupture is believed to occur when the mechanical stress acting on the wall exceeds the strength of the wall tissue. Therefore, knowledge of the stress distribution in an intact AAA wall could be useful in assessing its risk of rupture. We developed a methodology to noninvasively estimate the in vivo wall stress distribution for actual AAAs on a patient-to-patient basis. METHODS: Six patients with AAAs and one control patient with a nonaneurysmal aorta were the study subjects. Data from spiral computed tomography scans were used as a means of three-dimensionally reconstructing the in situ geometry of the intact AAAs and the control aorta. We used a nonlinear biomechanical model developed specifically for AAA wall tissue. By means of the finite element method, the stress distribution on the aortic wall of all subjects under systolic blood pressure was determined and studied. RESULTS: In all the AAA cases, the wall stress was complexly distributed, with distinct regions of high and low stress. Peak wall stress among AAA patients varied from 29 N/cm(2) to 45 N/cm(2) and was found on the posterior surface in all cases studied. The wall stress on the nonaneurysmal aorta in the control subject was relatively low and uniformly distributed, with a peak wall stress of 12 N/cm(2). AAA volume, rather than AAA diameter, was shown by means of statistical analysis to be a better indicator of high wall stresses and possibly rupture. CONCLUSION: The approach taken to estimate AAA wall stress distribution is completely noninvasive and does not require any additional involvement or expense by the AAA patient. We believe that this methodology may allow for the evaluation of an individual AAA's rupture risk on a more biophysically sound basis than the widely used 5-cm AAA diameter criterion.  (+info)

Removal of the subchondral plate in acetabular preparation. (8/1327)

Retention of the subchondral plate during acetabular preparation in total hip replacement is believed to be an important part of modern cementing techniques. We have constructed a two-dimensional finite element analysis to assess the effect of retention and removal of this relatively stiff structure. The finite element analysis demonstrates increased stiffness and stress concentrations at the bone-cement interface that may have an adverse effect. Although further study is required, it may be that subchondral bone retention is not advantageous.  (+info)

Practical Introduction to Non-Linear Finite Element Analysis 2-day training course on 26th & 27th September This non-linear Finite Element course is intended for delegates interested in learning how finite elements are used to analyse advanced non-linear problems, difficulties encountered in modelling real-life applications and guidelines for using non-linear finite element technology. The objectives of this Finite Element course are: To provide delegates with an introduction to the funda
Finite element analysis can provide insight to the complex mechanical behavior of natural and restored craniofacial structures affected by 3-D stress fields, which are still very difficult to assess otherwise. Even though the distribution of forces in peri-implant bone has been investigated by finite element analysis in several studies,33,34 a comparison of 2-dimensional finite element analyses and 3D-FE analyses in one study showed that only 3D-FE analysis could realistically simulate the stress pattern in space.35 Finite element modeling, like all in vitro studies that use model systems, has advantages and limitations. The 3-D model in this study was designed with precise geometry of the implant and the anatomy along with appropriate element type and count; however, certain assumptions were made in material properties and applied boundary conditions because of a lack of data and technology. Besides, technical difficulty in adjusting the degree of osseointegration led to the assumption of 100% ...
finite element analysis Free Download - static finite element analysis, finite element analysis for geology, finite element analysis dll library and more.
1] W.M. Bayliss, On the local reaction of the arterial wall to changes of internal pressure. J. Physiol. London 28 (1902) 220-231. [2] J. Berntsen, T.O. Espelid and A. Genz, Algorithm 698: DCUHRE: An adaptive multidimensional integration routine for a vector of integrals. ACM Trans. Math. Softw. 17 (1991) 452-456. , Zbl 0900.65053 [3] P.H.M. Bovendeerd, T. Arts, J.M. Huyghe, D.H. Van Campen and R.S. Reneman, Dependance of local left ventricular wall mechanics on myocardial fiber orientation: a model study. J. Biomech. 25 (1992) 1129-1140. [4] P.G. Ciarlet, The finite element method for elliptic problems, Vol. 4 of Studies in Mathematics and its Applications. North-Holland, Amsterdam-New York (1980). , MR 608971 , Zbl 0511.65078 [5] K.D. Costa, P.J. Hunter, J.S. Wayne, L.K. Waldman, J.M. Guccione and A.D. Mcculloch, A three-dimensional finite element method for large elastic deformations of ventricular myocardium: Part I. Cylindrical and spherical polar coordinates. ASME J. Biomech. Eng. 118 ...
Practical Introduction to Finite Element Analysis 3-Day Training Course An opportunity to ensure that your organization gets maximum benefit from using Finit Element Analysis. FEA has become widely used and universally accepted in many industry sectors. Finite Element Analysis is a powerful technique, able to produce solutions to challenging structural analysis problems. The technology and computational efficiency of the method, together with the rapid increases in computer processi
Lateral mass screw fixation (LSF) techniques have been widely used for reconstructing and stabilizing the cervical spine; however, complications may result depending on the choice of surgeon. There are only a few reports related to LSF applications, even though fracture fixation has become a severe complication. This study establishes the three-dimensional finite element model of the lower cervical spine, and compares the stress distribution of the four LSF techniques (Magerl, Roy-Camille, Anderson, and An), following laminectomy -- to explore the risks of rupture after fixation. CT scans were performed on a healthy adult female volunteer, and Digital imaging and communication in medicine (Dicom) data was obtained. Mimics 10.01, Geomagic Studio 12.0, Solidworks 2012, HyperMesh 10.1 and Abaqus 6.12 software programs were used to establish the intact model of the lower cervical spines (C3-C7), a postoperative model after laminectomy, and a reconstructive model after applying the LSF techniques. A
Based on the micropolar elasticity theory, a size-dependent rectangular element is proposed in this article to investigate the nonlinear mechanical behavior of plates. To this end, a novel three-dimensional formulation for the micropolar theory with the capability of being used easily in the finite element approach is developed first. Afterward, in order to study the micropolar plates, the obtained general formulation is reduced to that based on the Mindlin plate theory. Accordingly, a rectangular plate element is developed in which the displacements and microrotations are estimated by quadratic shape functions. To show the efficiency of the developed element, it is utilized to address the nonlinear bending problem of micropolar plates with different types of boundary conditions. It is revealed that the present finite element formulation can be efficiently employed for the nonlinear modeling of small-scale plates by considering the micropolar effects.. ...
A transient non-linear finite element (FE) model is developed in this paper to calculate the natural frequencies of a high-speed beehive spring and simulate its dynamic responses at different engine speeds, with consideration of material damping, internal vibration and coil collision. A 3D scanning technique is used to obtain an accurate geometry of the spring model for the simulation. To validate the FE model, a conventional analytical model with varying stiffness is also developed for the same spring. By comparing the results of both models with the experimental results of engine head tests, it is shown that the FE model can successfully simulate the dynamic responses of the spring under different speeds. Especially, the FE model can predict the erratic force spikes of the spring at high testing speeds, which cannot be predicted by the conventional analytical model. Based on the analysis, the dynamic deformation mechanisms of the high-speed beehive spring are summarised and discussed.. ...
Abductor weakness, and the resulting Trendelenburg gait, after total hip arthroplasty is believed to be associated with a poor long-term outcome. We have constructed a two-dimensional finite element analysis using load cases to mimic this abductor weakness. The finite element analysis demonstrates slightly increased stresses, particularly at the bone-cement interface in the DeLee-Charnley zone I, which does not seem sufficient to explain the adverse effect of abductor weakness. Laffaiblissement des muscles abducteurs et la démarche qui en résulte après le remplacement de la hanche par prothèse, peut être associé avec un résultat médiocre à long terme. Nous avons réalisé une étude par éléments finis à deux dimensions avec des situations imitant cette faiblesse des muscles abducteurs. Cette analyse montre une augmentation légère des contraintes particulièrement à linterface os-ciment dans la zone I de DeLee et Charnley. Ceci ne semble pas suffisant pour expliquer les effets
Introduction: Cryo-imaging is an ex vivo vascular imaging modality that acquires serial 2D fluorescence and bright-field images at 5µm increments without sacrifice to tissue morphology. These features make cryo-imaging an attractive approach for rendering high-resolution 3D volumes that serve as a basis for finite element analysis (FEA) studies of plaque rupture. The current study utilizes images extracted from cryo imaging to render a 3D finite element model of a human coronary vessel to determine the stress and strain fields throughout an atherosclerotic plaque.. Methods: Fresh frozen specimens were sectioned and imaged. Nearly 630 image slices were processed and segmented using the specialized image processing software, ScanIP. Segmented regions included the fibrous cap, calcium, lipid, and the vessel wall. A 3D volume of the coronary vessel was rendered. FEA was performed under linear elastic conditions where material behavior was defined by two constants, Youngs modulus and Poissons ...
Unstable pelvic fracture represents a severe injury associated with high morbidity and mortality. In the past, several types of fixators were used to treat this unstable fracture, including external fixators, plates, sacral bars, iliosacral screws, and pre-tensed curved bar. However, the biomechanical performances of the above fixation techniques were mainly evaluated according to the outcomes of clinical applications, and only one of the fixation techniques was selected and evaluated. To our knowledge, there were few studies to analyze and compare the biomechanical performances of different pelvic fixation techniques. In addition, the past studies had investigated one of the fixation techniques by using finite element methods. However, there has been no study that investigated the biomechanical performances of the fixation techniques by using 3D nonlinear finite element models of spine-pelvis-femur complex. Thus, the purpose of this study was to analyze and investigate the biomechanical ...
TY - JOUR. T1 - Dynamic finite element analysis of the human maxillary incisor under impact loading in various directions. AU - Huang, Haw Ming. AU - Ou, Keng Liang. AU - Wang, Wei Nang. AU - Chiu, Wen Ta. AU - Lin, Che Tong. AU - Lee, Sheng Yang. PY - 2005/10. Y1 - 2005/10. N2 - The aim of this study was to investigate fracture patterns occurring when a human upper central incisor is subjected to impact loadings at various angles. A two-dimensional finite element (FE) model of the maxillary incisor and surrounding tissues was established. The structural damping factor for the tooth was then calculated and assigned to the model. Dynamic FE analysis was performed to stimulate the associated impacts. Time-dependent traumatic forces at 0°, 45°, and 90° labially to the long axis of the tooth were applied to the model. Von Misess equivalent stress contours within the FE models were calculated. Our results indicated that tooth damping lagged behind peak stress by 0.05 ms. In addition, we found ...
DOI: 10.11607/jomi.4179 Purpose: Since bacterial leakage along the implant-abutment interface may be responsible for peri-implant infections, a realistic estimation of the interface gap width during function is important for risk assessment. The purpose of this study was to compare two methods for investigating microgap formation in a loaded dental implant, namely, microcomputed tomography (micro-CT) and three-dimensional (3D) nonlinear finite element analysis (FEA); additionally, stresses to be expected during loading were also evaluated by FEA. Materials and Methods: An implant-abutment complex was inspected for microgaps between the abutment and implant in a micro-CT scanner under an oblique load of 200 N. A numerical model of the situation was constructed; boundary conditions and external load were defined according to the experiment. The model was refined stepwise until its load-displacement behavior corresponded sufficiently to data from previous load experiments. FEA of the final, ...
The aim was to evaluate the influence on the stress distribution patterns in and the magnitude of stresses on fixed partial dentures (FPDs) under different anatomic and design conditions. Three-dimensional finite element models of posterior 3-unit all-ceramic FPDs were created with and without periodontal ligaments, with different radii of curvature at the embrasure area, and in a curve shape with a periodontal ligament. The model with a periodontal ligament showed 40% higher stress values compared to the no-ligament model. A smaller radius of curvature resulted in 20% to 40% higher stress values. The curved model increased stress values at the distal connector by 65% compared to the straight model. Support by teeth, occlusal curvature, and a small radius of curvature at the embrasure area negatively affect stress distribution patterns in the connector area of all-ceramic FPDs.. ...
In this work, we consider elastic wave propagation in fractured media. The mathematical model is described by the Helmholtz problem related to wave propagation with specific interface conditions (Linear Slip Model, LSM) on the fracture in the frequency domain. For the numerical solution, we construct a fine grid that resolves all fracture interfaces on the grid level and construct approximation using a finite element method. We use a discontinuous Galerkin method for the approximation by space that helps to weakly impose interface conditions on fractures. Such approximation leads to a large system of equations and is computationally expensive. In this work, we construct a coarse grid approximation for an effective solution using the Generalized Multiscale Finite Element Method (GMsFEM). We construct and compare two types of the multiscale methods—Continuous Galerkin Generalized Multiscale Finite Element Method (CG-GMsFEM) and Discontinuous Galerkin Generalized Multiscale Finite Element Method (DG
In the present work, a three-dimensional, dynamic and non-linear finite element to simulate thermoelectric behavior under a hyperbolic heat conduction model is presented. The transport equations, which couple electric and thermal energies by the Seebeck, Peltier and Thomson effects, are analytically obtained through extended non-equilibrium thermodynamics, since the local equilibrium hypothesis is not valid under the hyperbolic model. In addition, unidimensional analytical solutions are obtained to validate the finite element formulation. Numerically, isoparametric eight-node elements with two degrees of freedom (voltage and temperature) per node are used. Non-linearities due to the temperature-dependence on the transport properties and the Joule effects are addressed with the Newton-Raphson algorithm. For the dynamic problem, HHT and Newmark-ß algorithms are compared to obtain accurate results, since numerical oscillations (Gibbs phenomena) are present when the initial boundary conditions are ...
Finite element analysis (FEA) is a computer simulation technique used in engineering analysis. It uses a numerical technique called the finite element method (FEM) to solve partial differential equations. There are many finite element software packages, both free and proprietary. Development of the finite element method in structural mechanics is usually based on an energy principle such as the virtual work principle or the minimum total potential energy principle. * ...
Finite Element Method (FEM) is a numerical technique of obtaining solutions to boundary value problems. The practical application of Finite Element Method is called as Finite Element Analysis (FEA). FEA is the computational tool for performing engineering analysis. Biomechanical analysis involves dealing with the mechanical aspects of the biological systems. FEM techniques can be used to study the engineering analysis of different biological systems. Femur bone is the longest and strongest bone of the human body. It undergoes mostly compressive loading. It exhibits anisotropy, indicating that the strength is different in different directions when a force is applied. It is hyperelastic in nature. It has two anatomical structures namely cortical bone tissue and cancellous bone tissue. The cortical is dense and tightly packed. The cancellous is porous. Cortical section is superior in mechanical properties compared to cancellous section. Cortical and cancellous are formed with collagen fibers. Upon ...
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Finite Element Model of Cornea Deformation - Abstract. Cornea surgeons have observed that changes in cornea curvature can follow cataract surgery and cause astigmatism. The placement of surgical incisions has been shown to influence these curvature changes. Though empirical data has been collected about this phenomenon, a biomechanical model has not been employed in predicting post-surgical outcomes. This work implemented an incised finite element model of the eye to investigate factors influencing corneal shape after surgery. In particular, the effects of eye muscle forces and intra-ocular pressure were simulated. Cornea shape change was computed via finite element analysis, and the resulting change in cornea curvature was measured by fitting quadratic curves to the horizontal and vertical meridians of the cornea. Results suggest that these two sources of deforming force counteract each other and contribute to astigmatism in perpendicular directions.
Since the middle of the last century, computing power has increased sufficiently that the direct numerical approximation of Maxwells equations is now an increasingly important tool in science and engineering. Parallel to the increasing use of numerical methods in computational electromagnetism, there has also been considerable progress in the mathematical understanding of the properties of Maxwells equations relevant to numerical analysis. The aim of this book is to provide an up-to-date and sound theoretical foundation for finite element methods in computational electromagnetism. The emphasis is on finite element methods for scattering problems that involve the solution of Maxwells equations on infinite domains. Suitable variational formulations are developed and justified mathematically. An error analysis of edge finite element methods that are particularly well suited to Maxwells equations is the main focus of the book. The analysis involves a complete justification of the discrete de Rham
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DOI: 10.11607/jomi.3234 Purpose: Elevated bite forces and reduced bone densities and dimensions associated with posterior regions of the maxilla cause relatively high failure rates when short dental implants are placed to substitute missing teeth. This study uses the finite element method to evaluate four distinctly different short implant designs (Bicon, Neodent, Nobel Biocare, and Straumann) for their influences on the von Mises stress characteristics within the posterior maxilla. Materials and Methods: Finite element models of the supporting bone and tooth crowns are developed based on computed tomography data, and implant geometries are obtained from manufacturers catalogs. The finite element models are meshed using three-dimensional hexahedral and wedge-shaped brick elements. Assumptions made in the analyses are: linear elastic material properties for bone, 50% osseointegration between bone and implant, and crown height implant length ratio of 2:1. Results: Bicon s neck indentation produced ...
TY - GEN. T1 - Non-Linear Finite Element Modelling of Hydraulic Driven Multibody System. AU - Ylinen, Antti. AU - Mäkinen, Jari. AU - Marjamäki, Heikki. N1 - /kir12 . ei ut-numeroa 12.10.2013,br/,Contribution: organisation=mec,FACT1=0.5,br/,Contribution: organisation=rak rtek,FACT2=0.5,br/,Publisher name: Oulun yliopisto. PY - 2012. Y1 - 2012. M3 - Conference contribution. SN - 978-952-62-0006-4. T3 - Finnish Mechanics Days. Suomen Mekaniikkapäivät. SP - 57. EP - 62. BT - Proceedings of the 11th Finnish Mechanics Days. XI Suomen Mekaniikkapäivät, Oulun yliopisto 29.-30.11.2012. A2 - Hannu, Koivurova. A2 - Mikko, Malaska. PB - Oulun yliopisto. CY - Oulu. ER - ...
The backlite molding squeak noise is caused by the stick-slip type of friction between the window molding and the body panel. To predict if the molding would squeak a finite element analysis technique which uses the nonlinear explicit code LS-DYNA3D has been developed. The three dimensional finite element simulation technique is based on the threshold displacement velocity spectrum and the relative movement of the window glass with respect to the body panel. Comparisons between FEA analysis and tests are also presented in this paper ...
Learn how to perform finite element analysis (FEA) in MATLAB. Resources include videos, examples, and documentation covering finite element analysis and other topics.
Isherwood is able to leverage its experience to aid in Finite Element Analysis on sensitive projects. With our knowledge of soil and rock mechanics and shoring behaviour, the Finite Element Analysis is successfully used to identify risks to sensitive structures due to excavation and predict the magnitude of deformation of the shoring, soil, and surrounding buildings.. ...
Lecture 22 - Advanced Finite Elements Analysis This video is part of Lecture Series on Advanced Finite Elements Analysis by P...
Lecture 5 - Advanced Finite Elements Analysis This video is part of Lecture Series on Advanced Finite Elements Analysis by P...
In the present paper, applicability of the modified fixed grid finite element method in solution of three dimensional elasticity problems of functionally graded materials is investigated. In the non-boundary-fitted meshes, the elements are not conforming to the domain boundaries and the boundary nodes which are used in the traditional finite element method for the application of boundary conditions no longer exist. Therefore, special techniques are needed for computation of the stiffness matrix of boundary intersecting elements and application of boundary conditions.The stiffness matrix of boundary intersecting elements are calculated via integration of strain energy over the internal parts of these elements. Essential boundary conditions are applied using penalty function method. To examine the effectiveness of the proposed method, some numerical examples are solved and results are compared with those obtained using the standard finite element method.
An ideal occlusal scheme plays an important role in a good prognosis of All-on-Four applications, as it does for other implant therapies, due to the potential impact of occlusal loads on implant prosthetic components. The aim of the present three-dimensional (3D) finite element analysis (FEA) study was to investigate the stresses on abutments, screws and prostheses that are generated by occlusal loads via different occlusal schemes in the All-on-Four concept. Three-dimensional models of the maxilla, mandible, implants, implant substructures and prostheses were designed according to the All-on-Four concept. Forces were applied from the occlusal contact points formed in maximum intercuspation and eccentric movements in canine guidance occlusion (CGO), group function occlusion (GFO) and lingualized occlusion (LO). The von Mises stress values for abutment and screws and deformation values for prostheses were obtained and results were evaluated comparatively. It was observed that the stresses on ...
Finite element analysis is a method for solving partial differential equations (PDEs). There are many other methods for solving PDEs with different features, but finite element methods are attractive both because they work well with complex geometries and because they are relatively simple to implement and analyze. I use existing codes where appropriate, but have released several finite element software packages for simulating problems from MEMS design and analysis of human bone.. ...
There are several types of tenodesis reconstruction designed for subtalar instability. However, no comprehensive comparison has been conducted among these procedures in terms of their correcting power so far. The objective of this study is to evaluate the biomechanical behaviors of 5 representative procedures through finite element analysis. Finite element models were established and validated based on one of our previous studies. The Pisani interosseous talocalcaneal ligament (ITCL) reconstruction, Schon cervical ligament (CL) reconstruction and Choisne calcaneofibular ligament (CFL) reconstruction were compared on the model with the CFL, ITCL and CL sectioned. The Schon triligamentous reconstruction and Mann triligamentous reconstruction were compared on the model with the CFL, ITCL and CL, as well as the ATFL sectioned. The inversion and external/internal rotation were quantified at different ankle positions based on the rotational moment. Then, the stress in ligaments and reconstructed grafts and
View Notes - MIT2_092F09_lec05 from MECHANICAL 2.092 at MIT. 2.092/2.093 - Finite Element Analysis of Solids & Fluids I Fall 09 Lecture 5- The Finite Element Formulation Prof. K. J. Bathe
We use a 2 dimensional finite element model with heterogeneous elastic strengths in continental areas to model the regional stress field orientation and relative magnitudes in and around India for 33 Ma, 20 Ma and the present day. The large-scale geological structure of India is embedded in our model by using published outlines of cratons, fold belts and basins, associated with estimates of their relative strengths, enabling the modelling of stress field deflections along interfaces between relatively strong and weak tectonic elements through time. … Read more…. ...
When we consider the rehabilitation of patients with the mandibular implant supported over denture, the influence of the implant number and the cantilever design on the stress distribution on the bone needs to be assessed precisely. Purpose: The purpose of the simulation study was to compare the biomechanical behavior of the two implant supported over denture design with the All-On-Four Concept using the three dimensional finite element method thereby evaluating the Von Misses stresses induced on the implant under different loading simulations. Materials & Method: Three dimensional models representing mandible restored with two implant supported prosthesis was compared with the models that were restored based on the All-On-Four concept. The models were then subjected to four different loading simulations (full mouth biting, canine disclusion, load on cantilever, and load in the absence of cantilever). The maximum von Mises stresses were localized and quantified for comparison.1 Results: Among
Learn about finite element analysis (FEA), how it works and the difference between FEA and the finite element method. Explore the advantages of FEA, its common applications and the principles behind the method and analysis.
To study the effects of different designs in single mandibular molar implant restoration on the stress distribution of implant-bone interface. Methods: Three-dimensional finite element method were used. Results: When wide-diameter implant or two-implant were used to replace single mandibular molar, the stress of implant-bone interface was much lower than that of standard-diameter implant restoration. Comparison between wide-diameter implant and two-implant replacement showed that the former created lower stress. The difference was more obvious under oblique loads. Conclusion: Using wide-diameter implant or two-implant to restore single mandibular molar should be recommended in clinical practice. If adequate bone quantity is provided, using wide-diameter implant should be better.
In the shop floor, cracking issue was noticed during assembly of valve seat and valve guide in the engine cylinder head, especially near the valve seating area. This paper reveals a non- linear finite element methodology to verify the structural integrity of a cylinder head during valve seat and valve guide assembly press-in operation under the maximum material condition, i.e., smallest hole size on cylinder head for valve seat and guide and largest diameter of valve seat and guide. Material and geometrical nonlinearities, and contact are included in this method to replicate the actual seat and guide press-in operation which is being carried out in shop floor. The press-in force required for each valve seat and valve guide assembly is extracted from simulation results to find out the tonnage capacity of pressing machine for cylinder head assembly line. Stress and plastic deformation due to assembly load are the criteria checked against the respective material yield. Further the tolerance such as ...
We use Finite Element solver to calculate atoms position of elliptical shaped island in the box containing up to 100000 atoms. In this approach we describe bonds as pseudoelements and restrict calculations to two types of them: 2-node, which model interaction between 2(1 bond) atoms and 3-node, which model interaction between 3-atoms (2 bonds). Novel mesh generator was developed for creation of the pseudoelements compatible with standard Finite Element routines ...
TY - CONF. T1 - Finite element analysis of the tibial component stem orientation in revision total knee replacement. AU - Rastetter, Benjamin. AU - Wright, Samantha. AU - Gheduzzi, Sabina. AU - Miles, Anthony. AU - Clift, Sally. PY - 2015/9. Y1 - 2015/9. N2 - Background: Finite element (FE) models are frequently used in biomechanics to predict the behaviour of new implant designs.To increase the stability after severe bone loss tibial components with long stems are used in revision total knee replacements(TKR). A clinically reported complication after revision surgery is the occurrence of pain in the stem-end region. The aim ofthis analysis was the development of a validated FE-model of a fully cemented implant and to evaluate the effect of differenttibial stem orientations.Methods: A scanned 4th generation synthetic left tibia (Sawbones) was used to develop the FE-model with a virtually implantedfully cemented tibial component. The 500 N load was applied with medial:lateral compartment ...
Paris, France, and Providence, R.I., USA, May 15, 2007 - Dassault Systèmes (DS) (Nasdaq: DASTY; Euronext Paris: #13065, DSY.PA), a world leader in 3D and Product Lifecycle Management (PLM) solutions, announces the release of Abaqus Version 6.7, its technology-leading finite element analysis (FEA) software suite. Abaqus Version 6.7 introduces a new architecture for high-performance linear dynamics, advanced capabilities for composites simulation and nonlinear materials modeling, a new intuitive and highly customizable user interface for accelerated model building and results visualization, and two new interfaces for bi-directional CAD associativity. SIMULIA is delivering several important enhancements to their Abaqus FEA software that we expect will greatly improve overall productivity at Scania, stated Martin Edberg, head of chassis simulations, Scania CV AB. We are particularly impressed with the new high-performance linear dynamics functionality in Abaqus Version 6.7. The new linear ...
An application of the basic concepts of finite element modeling and analysis to various types of engineering technology problems including structural and machine component analysis, conduction and convection heat-transfer analysis, and fluid mechanics analysis. Selected analytical aspects of finite element analysis are introduced throughout the course without becoming too theoretical. ANSYS computer software is an integral part of the course and is used within the laboratory portion. Prerequisite: ENT 333. 2 Lec. 1 Lab.. Back to top. ...
Cable-stayed bridges can exhibit large amplitude irregular stay cable oscillations under certain conditions of combined traffic flow and rain-wind loads that can pose severe risks to structural integrity. To investigate the mechanisms causing this behavior, a high fidelity nonlinear finite element model of a typical cable-stayed bridge has been developed using LS-DYNA based on the design of the Bill Emerson Memorial Bridge at Cape Girardeau, MO. The model uses over 540,000 finite elements representing 1254 bridge components to fully describe the detailed real geometry of the bridge tower, deck, stay cables, edge girders and floor-beam support girders. Traffic loads on the bridge deck are simulated by a Poisson Distributed Pulse (PDP) stochastic process model involving multi-lane traffic flows of more than 300 vehicles of various axle loads with varying arrival rates. The response data sets generated by the LS-DYNA simulations were then analyzed for chaotic behavior with the software CTBR. This ...
The key objective of this work is the design of an unconditionally stable, robust, efficient, modular, and easily expandable finite element-based simulation tool for cardiac electrophysiology. In contrast to existing formulations, we propose a global-local split of the system of equations in which the global variable is the fast action potential that is introduced as a nodal degree of freedom, whereas the local variable is the slow recovery variable introduced as an internal variable on the integration point level. Cell-specific excitation characteristics are thus strictly local and only affect the constitutive level. We illustrate the modular character of the model in terms of the FitzHugh-Nagumo model for oscillatory pacemaker cells and the Aliev-Panfilov model for non-oscillatory ventricular muscle cells. We apply an implicit Euler backward finite difference scheme for the temporal discretization and a finite element scheme for the spatial discretization. The resulting non-linear system of ...
TY - JOUR. T1 - Fast estimation of Colles fracture load of the distal section of the radius by homogenized finite element analysis based on HR-pQCT. AU - Hosseini, H.S.. AU - Dünki, A.. AU - Fabech, J.. AU - Stauber, M.. AU - Vilayphiou, N.. AU - Pahr, D.. AU - Pretterklieber, M.. AU - Wandel, J.. AU - van Rietbergen, B.. AU - Zysset, Ph.K.. PY - 2017/4/1. Y1 - 2017/4/1. N2 - Fractures of the distal section of the radius (Colles fractures) occur earlier in life than other osteoporotic fractures. Therefore, they can be interpreted as a warning signal for later, more deleterious fractures of vertebral bodies or the femoral neck. In the past decade, the advent of HR-pQCT allowed a detailed architectural analysis of the distal radius and an automated but time-consuming estimation of its strength with linear micro-finite element (μFE) analysis. Recently, a second generation of HR-pQCT scanner (XtremeCT II, SCANCO Medical, Switzerland) with a resolution beyond 61 μm became available for even more ...
FRANCO uses two-dimensional finite element theory and applications for mechanical deformation and heat conduction, and determines the temperature distribution from the fuel center to the coolant adjacent to the clad at a position along the fuel rod axis. FRANCO calculates the average temperature of each radial division, the nodal displacement, and strain and stress within the fuel pellet and clad. The principal stresses, which represent maximum and minimum stresses within an element, result from Mohrs circle relationship between normal stresses. FRANCO is capable of predicting the thermo-mechanical behavior in the radial direction of a single fuel rod for both boiling water reactors (BWRs) and pressurized water reactors (PWRs). The cross sectional plane geometry of fuel rod is modeled using three-node constant strain triangular finite elements, and both thermal and mechanical solutions are computed with the same finite element configurations. The local linear heat generation rate is modeled ...
TY - JOUR. T1 - The effect of Bone quality on the initial stability of ankle arthrodesis with internal fixation. A finite element simulation. AU - Alonso-Vazquez, A. AU - Lauge-Pederson, H. AU - Lidgren, L. AU - Taylor, Mark. PY - 2004. Y1 - 2004. M3 - Article. VL - 25. SP - 840. EP - 850. JO - Foot and Ankle International. JF - Foot and Ankle International. SN - 1071-1007. ER - ...
Nucleus replacement technologies are a minimally invasive alternative to spinal fusion and total disc replacement that have the potential to reduce pain and restore motion for patients with degenerative disc disease. Finite element modeling can be used to determine the biomechanics associated with nucleus replacement technologies. The current study focuses on a new nucleus replacement device designed as a conforming silicone implant with an internal void. A validated finite element model of the human lumbar L3-L4 motion segment was developed and used to investigate the influence of the nucleus replacement device on spine biomechanics. In addition, the effect of device design changes on biomechanics was determined. A 3D, L3-L4 finite element model was constructed from medical imaging data. Models were created with the normal intact nucleus, the nucleus replacement device, and a solid silicone implant. Probabilistic analysis was performed on the normal model to provide quantitative validation metrics.
The stability of acetabulum reconstructions using reinforcement rings and hooks is important for successful replacement surgery. The objective of this study was to biomechanically determine the effects of the hook on stress and the related micromotions of the acetabular reinforcement ring during the immediate postoperative period. Acetabular reinforcement ring models were developed using a nonlinear, three-dimensional, finite element method. Using a pre-prepared template, we constructed without-hook and bone graft models of varying volumes and material properties. The stress on the inferior margin of the acetabulum was higher in the with-hook model than in the without-hook model, especially with increased bone graft volumes, and the stiffness of the bone graft material was decreased. Relative micromotions in the without-hook model were higher than in the with-hook models. The highest relative micromotion was observed in the model with increased bone graft volume and lower stiffness of bone graft
DISCUSSION. The mean fracture resistance results observed in the present study (Table 2) are higher than the mean bite force values reported by Lyons15 (1990) for canine teeth of approximately 22 kgf. In contrast, patients with bruxism presented a bite force of almost 26 kgf and the maximum bite force in the canine region ranged from 32 to 35 kgf.. In a study using the finite element method, Joshi, et al.13 (2001) observed that among all factors that interfere with the stress distribution pattern, post diameter and geometry contribute less to an increase or decrease of stresses in the tooth. In the present study, geometry was found to modify the stress distribution pattern (Figure 7), as demonstrated by Lewgoy, et al.14 (2003).. Posts do not reinforce debilitated teeth9, a fact that might be explained mechanically1,17. Cementation of a post during root treatment alters the load distribution pattern along its axis. The crack starts in the region of highest stress concentration (compressive or ...
In the total hip prosthesis, according to different positions of the patient, there are a variety of loads acting on femoral head which generate stress concentration in the cement called polymethylmethacrylat (PMMA) and consequently in the interfaces stem/cement/bone. This load transfer can provoke loosening of the implant from the femoral bone. This paper focused on optimal stress distribution in the total hip prosthesis and devoted to the development of a redesigned prosthesis type in order to minimize stress concentration in the cement. This study investigated the effect of elastomeric stress barrier incorporated between the stem and femoral head using 3D-finite element analysis. This proposed implant provoked lower load transfer in the cement due to the elastomeric effect as stress absorber. However, the proposed model provided an acceptable solution for load transfer reduction to the cement. This investigation permitted to increase the service life of the total hip prosthesis avoiding the ...
A novel approach combining the atomic force microscopy probing of nacre biopolymer strand and the inverse finite element analysis has been used to directly measure the elastic modulus of nacre biopolymer matrix. An elastic modulus of 11 ± 3 GPa was determined for the first time from the direct measurement of the nacre biopolymer matrix. This property is essential for a fundamental understanding of the roles that the biopolymer matrix plays in nacres strengthening and toughening, and provides guidelines in selecting engineering polymers for biomimetic materials design and fabrication. Such coupled experimental and modeling techniques should find more applications in studying the mechanical behavior of biological materials.
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This paper gives a bibliographical review of the finite element methods applied to the analysis and simulation of quenching and other heat treatment processes. The bibliography at the end of the paper contains references to papers, conference proceedings and theses/dissertations on the subjects that were published between 1976 and 2001. The following topics are included: quenching - quenching process in general, heat transfer and thermomechanical modelling, residual stresses in quenching, and other topics, hardening, annealing, tempering, and carburizing and nitriding. Three hundred and fifty references are listed. © 2003 Elsevier Science B.V. All rights reserved.. ...
In vivo rodent tail models are becoming more widely used for exploring the role of mechanical loading on the initiation and progression of intervertebral disc degeneration. Historically, finite element models (FEMs) have been useful for predicting disc mechanics in humans. However, differences in geometry and tissue properties may limit the predictive utility of these models for rodent discs. Clearly, models that are specific for rodent tail discs and accurately simulate the discs transient mechanical behavior would serve as important tools for clarifying disc mechanics in these animal models. An FEM was developed based on the structure, geometry, and scale of the mouse tail disc. Importantly, two sources of time-dependent mechanical behavior were incorporated: viscoelasticity of the matrix, and fluid permeation. In addition, a novel strain-dependent swelling pressure was implemented through the introduction of a dilatational stress in nuclear elements. The model was then validated against data ...
Purpose: To determine the favorable therapeutic position for Chinese manipulation in treating lumbar disc herniation. Methods: We developed a three-dimensional finite element model of L3-5 for the normal spine, along with a mild degeneration and a moderate degeneration model, and carried out a comparative study between the manipulation with lateral position and that with sitting position. The displacement and stress distribution in the intervertebral disc of L4 were investigated. Results: A displacement and stress directing forwards concentrated on the left rear of L4 disc were found in the three models under the two manipulations. The values of displacement and stress under the manipulations with lateral position are larger than those with sitting position in the three models. Conclusion: Lateral position has a better biomechanical effect than sitting position in treating lumbar disc herniation.. ...
Purpose: : Schlemms canal endothelial (SCE) cells are exposed to a basal-to-apical pressure difference that causes the cells to deform. We used finite element models and measured mechanical properties to determine the maximum pressure drop that SCE cells can support. Methods: : Finite element models of typical SCE cells were developed using scanning (SEM) and transmission (TEM) electron micrographs. Based on SEM images of the inner wall endothelium from 8 human eyes, 3 typical cellular footprints were chosen. Thickness profiles were measured from TEM images of 10 inner wall cells from 5 human eyes. Cell models were constructed using the 3 typical footprints and two possible thicknesses: (i) the average thickness of the cells; and (ii) the maximum thickness, the latter corresponding to a very strong cell (conservative case). Cells were assumed to be attached only at their periphery.A commercial finite element package ABAQUS was then used to compute: (i) cellular deformations for different ...
TY - JOUR. T1 - Probabilistic evaluation of the material properties of the in vivo subject-specific articular surface using a computational model. AU - Kang, Kyoung Tak. AU - Kim, Sung Hwan. AU - Son, Juhyun. AU - Lee, Young Han. AU - Kim, Shinil. AU - Chun, Heoung Jae. N1 - Publisher Copyright: © 2016 Wiley Periodicals, Inc.. PY - 2017/8. Y1 - 2017/8. N2 - This article used probabilistic analysis to evaluate material properties of the in vivo subject-specific tibiofemoral (TF) joint model. Sensitivity analysis, based on a Monte Carlo (MC) method, was performed using a subject-specific finite element (FE) model generated from in vivo computed tomography (CT) and magnetic resonance imaging (MRI) data, subjected to two different loading conditions. Specifically, the effects of inherent uncertainty in ligament stiffness, horn attachment stiffness, and articular surface material properties were assessed using multifactorial global sensitivity analysis. The MRI images were taken before and after ...
When immobile or neuropathic patients are supported by beds or chairs, their soft tissues undergo deformations that can cause pressure ulcers. Current support surfaces that redistribute under-body pressures at vulnerable body sites have not succeeded in reducing pressure ulcer prevalence. Here we show that adding a supporting lateral pressure can counter-act the deformations induced by under-body pressure, and that this pressure equalisation approach is a more effective way to reduce ulcer-inducing deformations than current approaches based on redistributing under-body pressure. A finite element model of the seated pelvis predicts that applying a lateral pressure to the soft tissue reduces peak von Mises stress in the deep tissue by a factor of 2.4 relative to a standard cushion (from 113 kPa to 47 kPa)-a greater effect than that achieved by using a more conformable cushion, which reduced von Mises stress to 75 kPa. Combining both a conformable cushion and lateral pressure reduced peak von Mises
The mechanical effects of varying the depth of cement penetration in the cement-bone interface were investigated using finite element analysis (FEA) and validated using companion experimental data. Two FEA models of the cement-bone interface were created from micro-computed tomography data and the penetration of cement into the bone was varied over six levels each. The FEA models, consisting of the interdigitated cement-bone constructs with friction between cement and bone, were loaded to failure in tension and in shear. The cement and bone elements had provision for crack formation due to excessive stress. The interfacial strength showed a strong relationship with the average interdigitation (r(2)=0.97 and r(2)=0.93 in tension and shear, respectively). Also, the interface strength was strongly related with the contact area (r(2)=0.98 and r(2)=0.95 in tension and shear, respectively). The FEA results compared favorably to the stiffness-strength relationships determined experimentally. Overall, ...
The ideal built-in tip and torque values of the straight wire appliance reduce the need for wire bending and hence reduce chair time. The vertical position of the bracket on the tooth surface can alter the torque exerted on the tooth. This is a result of the altered surface curvature observed at each vertical position. To further clarify the role of vertical bracket positioning on the applied torque and the resultant stresses in the periodontal ligament (PDL), we designed a mandibular first premolar using finite element modeling. Cone beam computed tomography of 52 patients (83 lower first premolars) was selected to be included in the study. Curvature was measured for points along the labial surface with increasing distances (0.5 mm increments) from the cusp tip by calculating the angle between tangents drawn from these points and the axis joining the cusp tip and the root apex. The mean values for each distance were calculated, and a finite element model was designed incorporating these mean values.
Authors: Robau-Porrua, Amanda , Pérez-Rodríguez, Yoan , Soris-Rodríguez, Laura M. , Pérez-Acosta, Osmel , González, Jesús E. Article Type: Research Article Abstract: This study investigated the effect of three different parameters of a dental implant on stress and strain values in the peri-implant bone by finite element analysis. In this work, the effect of diameter, length and elastic modulus on the biomechanical behavior of a new dental implant was simulated using the finite element method. A three-dimensional model of a mandible segment corresponding to the premolar region and twelve dental implant models were obtained. Loads in three directions were distributed on the surface of the coronal area of the dental implants. The dental implant models were obtained in the FreeCAD 0.16 software …and the simulations were made using the Abaqus/CAE software. In all cases, higher stress concentrations were obtained in the peri-implant cortical bone between 40.6 and 62.8 MPa, while the highest ...
Abstract: Being as a functional material, piezoelectric ceramics is applied to drive a micropump when it is composed to be a thin membrane on a brass film to form a diaphragm. According to the properties of the piezoelectric material, the stiffness of the diaphragm influences the vibration displacement and therefore the supply flow rate of the micropump. This paper focuses on the dynamic characteristic study of the micropump and the stiffness influence of the diaphragm on the characteristics. The mathematical model of the valve-less micropump considering the diaphragm stiffness is developed in order to predict the dynamic characteristics of the piezoelectric valve-less micropump. Using the 3-D finite element analysis (FEA) method, the static and vibration mode of the diaphragm are analyzed to obtain the diaphragm stiffness and natural frequency. The method using Matlab is to predict the pressure and flow rate characteristics of the micropump when the diaphragm stiffness is considered or not. ...
TY - JOUR. T1 - Effects of material properties on bacterial adhesion and biofilm formation. AU - Song, F.. AU - Koo, H.. AU - Ren, D.. PY - 2015/8/25. Y1 - 2015/8/25. N2 - Adhesion of microbes, such as bacteria and fungi, to surfaces and the subsequent formation of biofilms cause multidrug-tolerant infections in humans and fouling of medical devices. To address these challenges, it is important to understand how material properties affect microbe-surface interactions and engineer better nonfouling materials. Here we review the recent progresses in this field and discuss the main challenges and opportunities. In particular, we focus on bacterial biofilms and review the effects of surface energy, charge, topography, and stiffness of substratum material on bacterial adhesion. We summarize how these surface properties influence oral biofilm formation, and we discuss the important findings from nondental systems that have potential applications in dental medicine.. AB - Adhesion of microbes, such as ...
Abdominal aortic aneurysm (AAA) is the gradual weakening and dilation of the infrarenal aorta. This disease is progressive, asymptomatic, and can eventually lead to rupture-a catastrophic event leading to massive internal bleeding and possibly death. The mechanical environment present in AAA is currently thought to be important in disease initiation, progression, and diagnosis. In this study, we utilize porohyperelastic (PHE) finite element models (FEMs) to investigate how such modeling can be used to better understand the local biomechanical environment in AAA. A 3D hypothetical AAA was constructed with a preferential anterior bulge assuming both the intraluminal thrombus (ILT) and the AAA wall act as porous materials. A parametric study was performed to investigate how physiologically meaningful variations in AAA wall and ILT hydraulic permeabilities affect luminal interstitial fluid velocities and wall stresses within an AAA. A corresponding hyperelastic (HE) simulation was also run in order ...
A multiscale design and multiobjective optimization procedure is developed to design a new type of graded cellular hip implant. We assume that the prosthesis design domain is occupied by a unit cell representing the building block of the implant. An optimization strategy seeks the best geometric parameters of the unit cell to minimize bone resorption and interface failure, two conflicting objective functions. Using the asymptotic homogenization method, the microstructure of the implant is replaced by a homogeneous medium with an effective constitutive tensor. This tensor is used to construct the stiffness matrix for the finite element modeling (FEM) solver that calculates the value of each objective function at each iteration. As an example, a 2D finite element model of a left implanted femur is developed. The relative density of the lattice material is the variable of the multiobjective optimization, which is solved through the non-dominated sorting genetic algorithm II (NSGA-II). The set of ...
Cam femoroacetabular impingement (FAI) can impose elevated mechanical loading in the hip, potentially leading to an eventual mechanical failure of the joint. Since in vivo data on the pathomechanisms
In the study of mechanical properties of materials, isotropic means having identical values of a property in all directions. This definition is also used in geology and mineralogy. Glass and metals are examples of isotropic materials.[3] Common anisotropic materials include wood, because its material properties are different parallel and perpendicular to the grain, and layered rocks such as slate. Isotropic materials are useful since they are easier to shape, and their behavior is easier to predict. Anisotropic materials can be tailored to the forces an object is expected to experience. For example, the fibers in carbon fiber materials and rebars in reinforced concrete are oriented to withstand tension. ...
TY - GEN. T1 - Study of ultrasonic upsetting under radial and longitudinal die vibration. AU - Huang, Zhi Hong. AU - Lucas, M.. AU - Adams, M.J.. N1 - Copyright 2010 Elsevier B.V., All rights reserved.. PY - 2003. Y1 - 2003. N2 - A finite element analysis was described for the upsetting of a cylindrical specimen between two parallel rigid dies. The benefits of radial and longitudinal ultrasonic oscillation of the die in compressive deformation of a model soft solid were studied. The influence of oscillation direction on the interfacial friction boundary condition and thermal effects during the process was investigated. It was observed that oscillation in the radial direction results in greater reductions in forming force and friction.. AB - A finite element analysis was described for the upsetting of a cylindrical specimen between two parallel rigid dies. The benefits of radial and longitudinal ultrasonic oscillation of the die in compressive deformation of a model soft solid were studied. The ...
Structured grids with regular shaped uniform elements are easy to generate automatically and have been used in extended finite element approaches to avoid mesh generation difficulties. But the grid or mesh should ideally have higher resolution in areas where the solution has large gradients. In this paper a technique for refinement of structured grids is presented that allows refinement of the grid without violating compatibility requirements by using solution structures constructed using approximate step functions. Essential boundary conditions are applied using implicit boundary method, which allows boundary conditions to be imposed even when there are no nodes on the boundary. This grid refinement technique is evaluated using two dimensional elasticity problems that involve stress concentration.. Copyright © 2009 by ASME ...
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As in all tissues, mechanical forces in the aortic valve (AV) modulate the constituent cell populations physiology and biosynthetic activity. While advances have been made toward the understanding of this complex multi-scale relationship, the specific role that and extracellular matrix (ECM) coupling plays on the mechanical response of the AV interstitial cell (AVIC) is poorly understood. The current work, building on our previous preliminary work [1], explores the impact of cellular contractile behavior on effective tissue level stiffness in an effort to gain insight into the complex mechanisms involved. By developing a computational tool to separate intrinsic cell mechanics from the ECM in-situ, we can obtain an accurate representation of AVIC behavior within the native valve connective tissue matrix microenvironment. Two computational finite element (FE) models were developed using COMSOL Multiphysics 4.3 that represent the tissue-level (macro-scale) and the cell level (micro-scale) of the ...
This paper deals with the study of the nonlinear dynamics of a rotating flexible link modeled as a one dimensional beam, undergoing large deformation and with geometric nonlinearities. The partial differential equation of motion is discretized using a finite element approach to yield four nonlinear, nonautonomous and coupled ordinary differential equations (ODEs). The equations are nondimensionalized using two characteristic velocities-the speed of sound in the material and a velocity associated with the transverse bending vibration of the beam. The method of multiple scales is used to perform a detailed study of the system. A set of four autonomous equations of the first-order are derived considering primary resonances of the external excitation and one-to-one internal resonances between the natural frequencies of the equations. Numerical simulations show that for certain ranges of values of these characteristic velocities, the slow flow equations can exhibit chaotic motions. The numerical ...
Mathematical Problems in Engineering is a peer-reviewed, Open Access journal that publishes results of rigorous engineering research carried out using mathematical tools. Contributions containing formulations or results related to applications are also encouraged. The primary aim of Mathematical Problems in Engineering is rapid publication and dissemination of important mathematical work which has relevance to engineering. All areas of engineering are within the scope of the journal. In particular, aerospace engineering, bioengineering, chemical engineering, computer engineering, electrical engineering, industrial engineering and manufacturing systems, and mechanical engineering are of interest. Mathematical work of interest includes, but is not limited to, ordinary and partial differential equations, stochastic processes, calculus of variations, and nonlinear analysis.
Naramar Hardness indentation technique and stress-strain characteristics in compression. Water from to generate carbon dioxide gas reacts with the polyisocyanate component, which acts as a blowing agent.. For wood adhesives in wood composites, the internal bond strength test can be done with a or testing machine to determine the tensile strength. This is succeeding model of AF Series which had many delivery result to car industries, seat kis, raw materials manufacturers and public enterprises etc.. Chiao Fu Enterprise Co. AF Series is Automatic Hardness Tester for flexible urethane foams to be used for cushion materials in such products as car seat, furniture, and bedding, and for other kind of plastic foam. JIS-S This tester is for evaluating the strength and durability of furniture such as chairs or stools. A finite element approach with simplified room descriptionActa Acustica united with Acustica, , - Flexible polyurethane foam, process for its production, and seat for ...
In this study, the effects of these parameters on the fatigue life of spot-weld joints have been investigated. For this purpose, one of the most reliable fatigue assessment models, Coffin-Manson approach, was used. In order to accurately determine the stress and strain states, a nonlinear finite element analysis was carried out taking into account plastic deformations, residual stresses developed after unloading and contacting surfaces. The results provide designers with some guidelines to foresee the impact of design changes on fatigue strength of spot-weld joints ...
The characterization of the mechanical properties of soft materials has been traditionally performed through uniaxial tensile tests. Nevertheless, this method cannot be applied to certain extremely soft materials, such as biological tissues or cells that cannot be properly subjected to these tests. Alternative non-destructive tests have been designed in recent years to determine the mechanical properties of soft biological tissues. One of these techniques is based on the use of atomic force microscopy (AFM) to perform nanoindentation tests. In this work, we investigated the mechanical response of soft biological materials to nanoindentation with spherical indenters using finite element simulations. We studied the responses of three different material constitutive laws (elastic, isotropic hyperelastic and anisotropic hyperelastic) under the same process and analyzed the differences thereof. Whereas linear elastic and isotropic hyperelastic materials can be studied using an axisymmetric ...
An effective method has been developed for analysis of the multiharmonic forced response of large-scale finite element models of bladed discs with contact interfaces at blade roots. Area contact elements are developed to model nonlinear forces acting at the contact surfaces. The elements allow for unilateral normal and tangential friction contact forces. The friction model includes effects of the variable normal load and variation of the contact area. Numerical investigations of the forced response for realistic finite element models of bladed discs with root damping are performed for the first time. ...
Copyright in the material you requested is held by the American Society of Mechanical Engineers (unless otherwise noted). This email ability is provided as a courtesy, and by using it you agree that you are requesting the material solely for personal, non-commercial use, and that it is subject to the American Society of Mechanical Engineers Terms of Use. The information provided in order to email this topic will not be used to send unsolicited email, nor will it be furnished to third parties. Please refer to the American Society of Mechanical Engineers Privacy Policy for further information ...
The rupture of atherosclerotic plaques is known to be associated with the stresses that act on or within the arterial wall. The extreme wall tensile stress is usually recognized as a primary trigger for the rupture of the plaque. The present study used one-way fluid-structure interaction simulation to investigate the impacts of fibrous cap thickness and lipid core volume to the wall tensile stress value and distributions on the fibrous cap. Von Mises stress was employed to represent the wall tensile stress (VWTS). A total of 13 carotid bifurcation cases were manipulated based on a base geometry in the study with varied combinations of fibrous cap thickness and lipid core volume in the plaque. Values of maximum VWTS and a stress value of VWTS_90, which represents the cut-off VWTS value of 90% in cumulative histogram of VWTS possessed at the computational nodes on the luminal surface of fibrous cap, were used to assess the risk of plaque rupture for each case. Both parameters are capable of ...
Finite element models of human body segments have been developed in recent years. Numerical simulation could be helpful when understanding injury mechanisms and to make injury assessments. In the lower leg injury research in NISSAN, a finite element model of the human ankle/foot is under development. The mesh for the bony part was taken from the original model developed by Beaugonin et al., but was revised by adding soft tissue to reproduce realistic responses. Damping effect in a high speed contact was taken into account by modeling skin and fat in the sole of the foot. The plantar aponeurosis tendon was modeled by nonlinear bar elements connecting the phalanges to the calcaneus. The rigid body connection, which was defined at the toe in the original model for simplicity, was removed and the transverse ligaments were added instead in order to bind the metatarsals and the phalanges. These tendons and ligaments were expected to reproduce a realistic response in compression ...
Hot compression molding is a promising method to fabricate polymer stand-alone microlenses. A reliable theoretical as well as statistical analysis is required for the optimization of the process to minimize the residual stresses and to predict the amount of springback to achieve a better replication of the mold profile. This article in this context focuses on the finite element simulation (FES), optimization as well as experimental validation of hot compression molding of polymer stand-alone microlenses. Three steps such as molding, cooling, and demolding, under different molding parameters, were analyzed using ABAQUS/standard solver and the results were compared with experimental results. Compression test and compression relaxation test have been conducted at different temperatures and strain rates to characterize the rheological behavior of material. Two material models, linear viscoelastic and hyperelastic-viscoelastic models, were developed and used for compression test simulations. ...
Insulated Gate Bipolar Transistors (IGBTs) are widely used in the automotive industry as high power current switches. They are currently being introduced into traction applications (locomotives, trams, metros, etc.) where high reliability is extremely important. Modern locomotives have a lifetime of about 30 years during which they should not fail. Due to the complexity of the modules as mechanical systems and as electric circuits, it is of prime importance to select and set up the most suitable models which allow to extract valuable data. Accordingly, this work describes the models and associated equations which appear to be necessary to carry out failure analysis. It includes a general stationary fully coupled electro-thermomechanical analysis which is actually part of the commercial release of the software SOLIDIS-ISE. More specific features tailored to IGBTs failure analysis are currently implemented. It comprises thermal transient effects and plasticity/damage based models for the stress analysis.
Copyright in the material you requested is held by the American Society of Mechanical Engineers (unless otherwise noted). This email ability is provided as a courtesy, and by using it you agree that you are requesting the material solely for personal, non-commercial use, and that it is subject to the American Society of Mechanical Engineers Terms of Use. The information provided in order to email this topic will not be used to send unsolicited email, nor will it be furnished to third parties. Please refer to the American Society of Mechanical Engineers Privacy Policy for further information ...
Little guidance is available in the public domain for the design of the profiled blastwalls commonly used in offshore structures to resist accidental explosions. The provision of the Technical Note 5 (TN5) has helped to bridge some of the gaps and it deals mainly with the Single Degree of Freedom method (SDOF) to obtain the dynamic response of the blastwalls. The adequacy of the design guide is assessed by comparison with numerical nonlinear finite element models for three profiled sections with different degree of compactness. The static capacity and the dynamic response of the blast walls are established up to their maximum capacity level and into the post peak or buckling response regime. Effects of cross section flattening, local transverse effects, support rotation and the effects of cross section compactness on the overall behaviour of the blast barriers are discussed. Copyright © 2004 by The International Society of Offshore and Polar Engineers ...
An attempt is made to model the thermal history of a self-gravitating Moon. Since the Rayleigh number at the end of the accretionary stage is supercritical, thermal convection in the Moon is likely to have occurred as early as 4.6 billion years ago. A combination of the Stokes equation of viscous flow and the heat transfer equation is solved, using the finite element method. The numerical code used is a modification of Gartlings NACHOS, a general purpose code for transient, two-dimensional incompressible fluid flow problems. The effects of melting, viscous dissipation and adiabatic gradient are included. A uniform distribution of radioactive nucleides is assumed, and their decay with time is taken into account. The code also allows for the simulated growth of a core of 300 km radius, and the energy that such a process releases into the convecting mantle. Viscosity is assumed to be Newtonian, appropriate for a mantle of dry olivine composition. An accretionary initial temperature profile is ...
Finite element analysis[edit]. Main article: Finite element analysis. Finite Element Analysis is a computational tool used to ... as the basis of Finite Element Analysis (FEA) or Finite Element Method (FEM) dates back to 1941. But the evolution of computers ... Structural analysis[edit]. Main articles: Structural analysis and Failure analysis. Structural analysis is the branch of ... Three-dimensional models created using CAD software are also commonly used in finite element analysis (FEA) and computational ...
Finite element analysis. License. GPL (version 2) with "runtime exception". Website. www. .dune-project. .org. ... These are mainly intended to be used in finite element and finite volume applications, but also finite difference methods are ... This is what sets DUNE apart from other finite element programs. DUNE is primarily a set of abstract interfaces, which embody ...
Widas, P. (1997, April 9). Introduction to finite element analysis. Retrieved from "Archived copy". Archived from the original ... Among the fundamental elements of the design process are the establishment of objectives and criteria, synthesis, analysis, ... It can also calculate stress and displacement using the finite element method to determine stresses throughout the part. The ... It outlines and analyses alternatives or methods of achieving the desired outcome. The feasibility study helps to narrow the ...
Pre-construction testing may adopt finite element analysis (FEA) for ply-by-ply analysis of curved surfaces and predicting ... What is Finite Element Analysis? Matzkanin, George A.; Yolken, H. Thomas. "Techniques for the Nondestructive Evaluation of ... Within the finished structure, the individual elements remain separate and distinct, distinguishing composites from mixtures ... dissimilar chemical or physical properties and are merged to create a material with properties unlike the individual elements. ...
"Effel: Finite element analysis software". GRAITEC. "Arche : Structural analysis of reinforced concrete buildings". GRAITEC. " ... finite elements analysis and results post-processing. It conducts static and dynamic analysis of 2D and 3D structures, from ... Based on the finite element calculation method, Effel performs static and dynamic analyses of 2D or 3D buildings. The software ... "Advance Design: Professional Finite Element Analysis Software with Concrete / Steel / Timber structures presizing and automatic ...
Finite element analysis in vertebrate morphology. Annual Reviews in Earth and Planetary Sciences 35: 541-576. Rayfield, E. J. ... This study was expanded upon in a comparative finite element analysis of 2D theropod skulls (namely Allosaurus Coelophysis and ... using computational methods such as finite element analysis (FEA). In the landmark paper Rayfield et al. (2001), the skull of ...
Some have involved finite element analysis. One of the commonly referenced empirical estimations was published by McKee in 1963 ...
... Mechanical finite element analysis software is used to simulate computer models of structures, electronics, or machine ... At the time, engineers performed finite element analysis (FEA) by hand. Westinghouse rejected Swanson's idea to automate FEA by ... Wahab, M.A. (2014). The Mechanics of Adhesives in Composite and Metal Joints: Finite Element Analysis with ANSYS. Destech ... Reh, Stefan; Beley, Jean-Daniel; Mukherjee, Siddhartha; Khor, Eng Hui (2006). "Probabilistic finite element analysis using ...
"Finite element for cylindrical thin shells under harmonic forces". Finite Elements in Analysis and Design. 52: 83-92. doi: ...
Finite Elements in Analysis and Design. 91: 16-29. doi:10.1016/j.finel.2014.06.011. Integral Kinesiology Feedbackfor Weight and ... 270-2. Bratland, Magne; Haugen, Bjørn; Rølvåg, Terje (2014). "Modal analysis of active flexible multibody systems containing ... thusly defining PID in the context of Integrals and Derivatives of a position of a control element in the Bratland sense ... "Memory Elements: A Paradigm Shift in Lagrangian Modeling of Electrical Circuits". IFAC Proceedings Volumes. 45 (2): 445-450. ...
... based on strong form governing equation for adaptive analysis of solid mechanics problems". Finite Elements in Analysis and ... Numerical methods such as the finite difference method, finite-volume method, and finite element method were originally defined ... Generalized finite difference method (GFDM) Particle-in-cell (PIC) Moving particle finite element method (MPFEM) Finite cloud ... Meshfree Interface-Finite Element Method (MIFEM) (2015) - a hybrid finite element-meshfree method for numerical simulation of ...
Finite Elements in Analysis and Design. 135: 44-55. doi:10.1016/j.finel.2017.07.005. Jenkins, Nicholas; Maute, Kurt (2016). "An ... Large numbers of finite elements increases the attainable topological complexity, but come at a cost. Firstly, solving the FEM ... This is most commonly done using the finite element method since these equations do not have a known analytical solution. There ... Solving TO problems in a discrete sense is done by discretizing the design domain into finite elements. The material densities ...
ISBN 978-3-540-32612-0. Ferreira, A.J.M. (2009). MATLAB Codes for Finite Element Analysis. Springer. ISBN 978-1-4020-9199-5. ... The list of elements should be surrounded by square brackets []. Parentheses () are used to access elements and subarrays (they ... For example, mod(2*J,n) will multiply every element in J by 2, and then reduce each element modulo n. MATLAB does include ... 0 1 3 5 Most functions accept arrays as input and operate element-wise on each element. ...
Some have involved finite element analysis. One of the commonly referenced empirical estimations was published by McKee in 1963 ... "Box Compression Analysis of World Wide Data", Wood and Fiber Science, 2006, [1] Yam, K.L., "Encyclopedia of Packaging ...
Finite Element Analysis of Composite Materials. CRC Press, Boca Raton, Florida, 2007. [2] S.A. Baeurle, A. Hotta, A.A. Gusev, ... Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain. Whereas ... Abaqus Analysis User's Manual, 19.7.1 Time domain vicoelasticity, 6.10 edition, 2010 Computer Aided Material Preselection by ... Each model differs in the arrangement of these elements, and all of these viscoelastic models can be equivalently modeled as ...
... (Finite Elements for Biomechanics) is a software package for finite element analysis and was specifically designed for ... Bonet, Javier; Wood, Richard (2008). Nonlinear Continuum Mechanics for Finite Element Analysis. Cambridge University Press. ... Maas, SA; Ellis BJ; Ateshian GA; Weiss JA (2012). "FEBio: Finite elements for biomechanics". Journal of Biomechanical ... Solid 3D linear and quadratic elements (tetrahedral, hexahedral, pentahedral). Linear and quadratic shell elements that can be ...
Finite Element Analysis in Geotechnical Engineering: Application. Thomas Telford. p. 254. ISBN 9780727727831. Vasari, Giorgio ( ... It was built by Tommaso di Andrea Pisano, who succeeded in harmonizing the Gothic elements of the belfry with the Romanesque ... It was, however, considered important to retain the current tilt, due to the role that this element played in promoting the ... Roth, Leland M. (13 March 2018). Understanding Architecture: Its Elements, History, and Meaning. Routledge. p. 98. ISBN ...
For this, the finite element method is the most popular. The analysis can be one-, two-, or three-dimensional. For the majority ... O'Brien, E.J; Keogh, D.L (December 1998). "Upstand finite element analysis of slab bridges". Computers & Structures. 69 (6): ... is sufficient or an upstand finite element model. On completion of the analysis, the bridge is designed to resist the applied ... In a suspension or cable-stayed bridge, the elements in tension are distinct in shape and placement. In other cases the forces ...
Finite Element Analysis has been advocated for, or applied in, taxiway bridge design since at least 1963. Taxiway bridges and ... p.3. Alan R. Jefts (1983). Finite Element Analysis of a Taxiway Bridge. American Society of Civil Engineers. in book ... "Dynamic Analysis of the Taxiway Bridge Under Aircraft Moving Load". Corrosion Investigation Study of Reinforcing Steel Taxiway ...
CS1 maint: discouraged parameter (link) Sun, Da Wei; Wang, Kang Ping; Yao, Hui Qin (30 April 2011). "3D Finite Element Analysis ...
... a finite element analysis rupture index (FEARI); biomechanical factors coupled with computer analysis; growth of ILT; ... Doyle BJ, Callanan A, Walsh MT, Grace PA, McGloughlin TM (2009). "A finite element analysis rupture index (FEARI) as an ... "A comparative study of aortic wall stress using finite element analysis for ruptured and non-ruptured abdominal aortic ... of these approaches involve the numerical analysis of AAAs using the common engineering technique of the finite element method ...
Finite element analysis[edit]. Main article: Finite element analysis. This field is not new, as the basis of Finite Element ... Structural analysis[edit]. Main articles: Structural analysis and Failure analysis. Structural analysis is the branch of ... Three-dimensional models created using CAD software are also commonly used in finite element analysis (FEA) and computational ... These tools include finite element analysis (FEA), computational fluid dynamics (CFD), and computer-aided manufacturing (CAM). ...
Inspired by his advisor, Prof' John F. Booker, his doctorate Thesis was "Finite Element Analysis of Lubrication in Natural ... Finite Element Analysis of Lubrication in Natural Joints. Cornell University. p. 416. Eidelberg, B.; Booker, J. (January 1, ... 98 (1): 5. Eidelberg, B.; Booker, J. (January 1, 1976). "Closure to "Discussion of 'Application of Finite Element Methods to ... From 2017-2019 Eidelberg developed and taught distance learning courses in Robotics, Finite Element Methods and Manufacturing ...
MUMPS Skyline matrix Banded matrix Irons, Bruce M. (1970). "A frontal solution program for finite element analysis". ... is an approach to solving sparse linear systems which is used extensively in finite element analysis. It is a variant of Gauss ... Finite Element Handbook. I. S. Duff , J. K. Reid, The Multifrontal Solution of Indefinite Sparse Symmetric Linear, ACM ... The element matrices are read from files or created as needed and discarded. A multifrontal solver of Duff and Reid is an ...
Vachon, Reginald I. "Finite element analysis fatigue gage." U.S. Patent No. 6,874,370. 5 Apr. 2005. Stephen Archie McLeod. The ...
... contributions to the art of finite-element analysis." He was also a Fellow of the IEE, and of the Royal Society of Canada. His ... Finite Elements for Electrical Engineers, 2ed, Cambridge University Press, 1990. Peter P. Silvester, Giuseppe Pelosi, Finite ... as well as new kinds of elements and formulations, open-boundary problems, and parallel computing. His book, Finite Elements ... His paper, Finite-Element Solution of Homogeneous-Waveguide Problems, presented at the 1968 URSI Symposium on Electromagnetic ...
Maor E, Rubinsky B (March 2010). "Endovascular nonthermal irreversible electroporation: a finite element analysis". Journal of ... with up to 6-year follow-up is limited as a heterogeneous retrospective analysis and no prospective clinical trial. Therefore, ... The expected effectiveness was not met at interim analysis and the trial was stopped prematurely. Complications included ... March 2017). "Percutaneous Irreversible Electroporation: Long-term survival analysis of 71 patients with inoperable malignant ...
In this discipline, numerical methods such as finite-element analysis are used to analyze the electric/magnetic fields ... Mukesh, S. (2017). "Modeling intracochlear magnetic stimulation: a Finite-Element Analysis". IEEE Transactions on Neural ... Mukesh, S. (2017). "Modeling intracochlear magnetic stimulation: a Finite-Element Analysis". IEEE Transactions on Neural ... Such simulations use models described above within a finite element framework. Apart from conventional magnetic domains and ...
... is finite element analysis software package. Steady-state and transient heat transfer + thermal radiation Stress ... analysis Soft body dynamics Modal analysis Computational fluid dynamics + heat transfer, contaminant dispersion Electrostatics ...
Cao, W., Demeler B. Modeling Analytical Ultracentrifugation Experiments with an Adaptive Space-Time Finite Element Solution for ... Sedimentation Velocity Analysis of Heterogeneous Protein-Protein Interactions: Lamm Equation Modeling and Sedimentation ... Molecular properties can be modeled through sedimentation velocity analysis or sedimentation equilibrium analysis. During the ...
... a is a correction for intermolecular forces and b corrects for finite atomic or molecular sizes; the value of b equals the Van ... A more recent analysis of the Cambridge Structural Database, carried out by Alvarez, provided a new set of values for 93 ... values for the van der Waals radii of the elements. Rowland and Taylor re-examined these 1964 figures in the light of more ... naturally occurring elements.[6] A simple example of the use of crystallographic data (here neutron diffraction) is to consider ...
Hilberg's analysis of the steps that led to the destruction of European Jews revealed that it was "an administrative process ... Peter Longerich argues that the search for a finite date on which the Nazis embarked upon the extermination of the Jews is ... the troops will encounter an especially dangerous element from the civilian population, and therefore, have the right and ...
Done (needed to create the redirect primitive element (free group), and to edit the linked dab page) D.Lazard (talk) 14:11, 9 ... Thus, I'd say, it is THEIR decision, to treat "number" as "finite number". I just respect their (quite reasonable) decision. ... For example, the discipline of topology heavily overlaps with geometry, analysis, algebra, etc. And Wikipedia should explain ... The basic idea is that you get more flexibility by working with maps not elements; i.e., you get more invariants to work with ...
finite. A graph is finite if it has a finite number of vertices and a finite number of edges. Many sources assume that all ... 5. An odd graph is a special case of a Kneser graph, having one vertex for each (n − 1)-element subset of a (2n − 1)-element ... 2. Power graph analysis is a method for analyzing complex networks by identifying cliques, bicliques, and stars within the ... A graph is locally finite if each vertex has a finite number of incident edges. An infinite graph is a graph that is not finite ...
If the intersection ZD1 ∩ ZD2 ∩ ZD3 is finite, then it has degree 23 = 8, and therefore there are eight solutions to the ... Casey J (1886) [1881]. A sequel to the first six books of the Elements of Euclid. Hodges, Figgis & co. p. 122. ISBN 978-1-4181- ... Needham, T (2007). Visual Complex Analysis. New York: Oxford University Press. pp. 140-141. ISBN 978-0-19-853446-4. .. ... Since it is possible to exhibit a circle that is tangent to D at only a single point, a generic element of ZD must be tangent ...
Maunder M.N. (2003) Paradigm shifts in fisheries stock assessment: from integrated analysis to Bayesian analysis and back again ... The capture probability is often defined as a two-variable model, in which f is defined as the fraction of a finite resource ... German tank problem, for estimation of population size when the elements are numbered. ... Maunder, M. N. (2004). "Population viability analysis, based on combining integrated, Bayesian, and hierarchical analyses". ...
Alan Donagan (1987). Choice: The Essential Element in Human Action. Routledge & Kegan Paul. ISBN 978-0-7102-1168-2. Retrieved ... The first part of their analysis (which the only relevant part to this section) was not meant to discover the types of free ... the future is ill-defined for all finite beings. The only well-defined things are "expectations". The ability to do "otherwise ... Without entering into metaphysical speculations, I may perhaps add that an analysis of the very concept of explanation would, ...
This offset analysis system continued for 3 years until their analysis chains were proved to produce equivalent results. Thus, ... This is called neutrino oscillation; this discovery indicates the finite mass of neutrinos and suggests an extension of the ... In addition to serving as rigid structural elements, supermodules simplified the initial assembly of the ID. Each supermodule ... The first stage data reduction processes were done for the high energy analysis and for the low energy analysis. The data ...
... because the mass of the nucleus is always finite, the energy spectra of hydrogen-like atoms must depend on the nuclear mass. ... but it was long before an extension to the spectra of other elements could be accomplished. ... other atoms possess at least two electrons in their neutral form and the interactions between these electrons makes analysis of ... ", "H-gamma" and so on, where H is the element hydrogen.[9] Four of the Balmer lines are in the technically "visible" part of ...
Finite element method, and many more. ... thermal analysis, electron microscope analysis, etc. Structure ... Important elements of modern materials science are a product of the space race: the understanding and engineering of the ... Cullity, B.D. (1978). Elements of X-Ray Diffraction (2nd ed.). Reading, Massachusetts: Addison-Wesley Publishing Company. ISBN ... Biomaterials science encompasses elements of medicine, biology, chemistry, tissue engineering, and materials science. ...
This method of analysis is known as partial-equilibrium analysis (supply and demand). This method aggregates (the sum of all ... A common element is the interaction of economic and political influences, broadly described as political economy. Comparative ... and the finite amount of time they have to make and execute a decision. Economic science centres on the activities of the ... This includes standard analysis of the business cycle in macroeconomics. Analysis often revolves around causes of such price ...
J. C. Gibbings, Dimensional Analysis, p.37, Springer, 2011 ISBN 1849963177. *^ Sensation and Perception, p. 268, at Google ... In professional audio, equipment may be calibrated to indicate a "0" on the VU meters some finite time after a signal has been ... there are many elements concatenated, and each has its own gain or attenuation. To obtain the total, addition of decibel values ... Quantities in decibels are not necessarily additive,[24][25] thus being "of unacceptable form for use in dimensional analysis". ...
A variety V over a finite field with q elements has a finite number of rational points, as well as points over every finite ... Beilinson, A. A.; Bernstein, Joseph; Deligne, Pierre (1982), "Faisceaux pervers", Analysis and topology on singular spaces, I ( ... More precisely, ζ(X, s) can be written as a finite alternating product ∏. i. =. 0. 2. n. P. i. (. q. −. s. ). (. −. 1. ). i. + ... Deligne's theorem states that if f is a morphism of schemes of finite type over a finite field, then Rif! takes mixed sheaves ...
... if and only if the elements of the second one are the products of the elements of the first one by a fixed nonzero element of K ... Hirschfeld, J. W. P. (1979), Projective Geometries Over Finite Fields, Oxford University Press, ISBN 978-0-19-850295-1. ... Ring homographies have been used in quaternion analysis, and with dual quaternions to facilitate screw theory. When A is taken ... of P(V), the definition implies the existence of nonzero elements of K such that λ. 0. e. 0. +. ⋯. +. λ. n. +. 1. e. n. +. 1. = ...
The supply of star-forming material is finite; once stars have converted the available supply of hydrogen into heavier elements ... Both analyses failed to take into account the absorption of light by interstellar dust present in the galactic plane, but after ... If so, these huge stars would have quickly consumed their supply of fuel and became supernovae, releasing heavy elements into ... The cycle of stellar birth and death slowly increases the abundance of heavy elements, eventually allowing the formation of ...
Considered as an element of the world, God has the same degree and kind of objective reality as do other products of mind ... He also formulated the theory of Hilbert spaces, one of the foundations of functional analysis. Hilbert is known as one of the ... John Horton Conway (1937-): British mathematician active in the theory of finite groups, knot theory, number theory, ... She was a pioneer in the genetic analysis of bacteriophages and contributed to the early development of molecular biology.[181] ...
Analysis. *Calculus. *Real analysis. *Complex analysis. *Differential equations. *Functional analysis. *Harmonic analysis ...
If one defines natural numbers to be the cardinalities of finite sets, (the cardinality of a set is the number of elements in ... Rudin, Walter (1976). Principles of Mathematical Analysis (3 ed.). McGraw-Hill. ISBN 0-07-054235-X.. ... The sum of real numbers a and b is defined element by element:. *Define a. +. b. =. {. q. +. r. ∣. q. ∈. a. ,. r. ∈. b. }. .. ... From Finite Sets to Feynman Diagrams. p. 29. arXiv:math.QA/0004133 . ISBN 3-540-66913-2.. ...
The child element is within the parent element, such as in a Venn diagram. This structure is most effective in representing ... Bayesian Analysis. Carnegie Mellon University, Pittsburgh, Pennsylvania: International Society for Bayesian Analysis. 2 (1): ... The Dewey Decimal System is regarded as infinitely hierarchical because there is no finite bound on the number of digits can be ... Child elements are towards the bottom of the stairs and parent elements are at the top. This structure represents hierarchical ...
... and finite element analysis. At low frequencies, the application of electrical network theory to the acoustic performance ... Plasma arc loudspeakers use electrical plasma as a radiating element. Since plasma has minimal mass, but is charged and ... If mounted on a finite baffle, and these out of phase waves are allowed to interact, dipole peaks and nulls in the frequency ...
"Robustness Analysis of Sparsity Based Tumor Localization under Tissue Configuration Uncertainty". IEEE Signal Processing in ... This procedure reduces damage to healthy tissue between the charged particle radiation source and the tumor and sets a finite ... who discovered the radioactive elements polonium and radium in 1898. This began a new era in medical treatment and research.[81 ... However, predicting the sensitivity based on genomic or proteomic analyses of biopsy samples has proved difficult.[40][41] An ...
Some elements make a particular region more vulnerable to famine. These include poverty, population growth,[148] an ... "Shrinking African Lake Offers Lesson on Finite Resources". National Geographic News. *^ David Pimentel, Mario Giampietro 1994. ... In an analysis of the programme by the Overseas Development Institute, CABDA's focus on individual and community capacity- ... a global scale quantitative analysis of how grain crops are sensitive to drought". Food Security. 4 (2): 163-179. doi:10.1007/ ...
Throughout retrospective analyses Kierkegaard has been viewed as an apolitical philosopher.[282][283][284] Despite this ... As already noted, he argues that doubt is an element of faith and that it is impossible to gain any objective certainty about ... First one assumes the finite, then the infinite, and then says on paper: This must be mediated. An existing person has ... 20th Century Philosophers, The Age of Analysis, selected with introduction and commentary by Morton White 1955 p. 118-121 ...
The outer magnetic field can be evaluated numerically with the help of finite element analysis or by simply measuring the ... For a more accurate calibration, however, an analysis in Fourier space is necessary. The power spectrum density P. (. ω. ). {\ ... The analysis is the same for the direction orthogonal to the x-direction and may be used to increase precision. If the bead ... For more accurate results, one may subtract the effect due to finite camera integration time from the experimental spectrum ...
These are used to perform tasks such as:- Stress analysis, FEA (finite element analysis); kinematics; computational fluid ... "Comprehensive Information and Analysis of the PLM Market" (Press release). CIMdata... 2006-10-11. Retrieved 20 June 2012.. ... The process behind the manufacture of a given compound is a key element of the regulatory filing for a new drug application. As ... In some concepts, the investment of resources into research or analysis-of-options may be included in the conception phase - e. ...
Functional analysis[edit]. Functional analysis is the branch of mathematics, and specifically of analysis, concerned with the ... These elements help describe how even seemingly simple systems display baffling nonlinearity.. Topological dynamics[edit]. ... A major theme in the mathematical and computational analysis of graph dynamical systems is to relate their structural ... with no random elements involved. This behavior is known as deterministic chaos, or simply chaos.. Complex systems[edit]. ...
This dimension is finite if and only if the space's Hamel dimension is finite, and in this case the two dimensions coincide. ... a second open cover where each element is a subset of an element in the first cover) such that no point is included in more ... While analysis usually assumes a manifold to be over the real numbers, it is sometimes useful in the study of complex manifolds ... For an algebra over a field, the dimension as vector space is finite if and only if its Krull dimension is 0. ...
Moreover, pure Python implementations of finite element and finite volume discretizations using the NumPy/SciPy scientific ... Principal component analysis. *Singular value decomposition. *Nonlinear dimensionality reduction. *System identification. * ... affine or arbitrarily parameter dependent evolution problems with finite element, finite volume or local discontinuous Galerkin ...
The second element of Alfred's society is fighting men. The subject of war and the Anglo-Saxons is a curiously neglected one[ ... "Kingdom and community in early Anglo-Saxon eastern England." Regional approaches to mortuary analysis. Springer US, 1995. 147- ... finite verbs that agreed with their subject in person and number; and nouns that came in numerous declensions (with deep ... However the Anglo-Saxons believed in 'luck' as a random element in the affairs of man and so would probably have agreed that ...
Resources include videos, examples, and documentation covering finite element analysis and other topics. ... Learn how to perform finite element analysis (FEA) in MATLAB. ... Finite element analysis (FEA) is a computational method for ... Finite element analysis provides numerical solutions to boundary value problems that model real-world physics as partial ... You can use the results of finite element analysis to observe stress, strain, deformation, temperature, and heat flux and to ...
This course emphasizes on the various aspects of structural analysis. Topics covered provide a useful guide for use of FEA for ... including finite element analysis) and solid mechanics. In addition, he teaches undergraduate engineering design, and serves as ... Steinbrink has research interests in design, mechanics of composite materials, and finite element methods, particularly in ... Basic terminology (node, element, degrees of freedom, etc.). - Basic mathematical principles (element equations f = kd; global ...
... 980750. Elkhart Industrial Division of Amcast Industrial Corporation has ... This paper will describe how a general purpose Finite Element Analysis (FEA) software can be used to develop inserted tooling ... Citation: Dharia, M., "Inserted Tool Design Using Finite Element Analysis," SAE Technical Paper 980750, 1998, https://doi.org/ ... Data presented in this paper will explain the computer models and analysis iterations used to develop optimal inserted tooling ...
The Finite Element Analysis (FEA) has been widely implemented by automotive companies and is used by design engineers as a tool ... If you participated in the SAE Vibration Analysis using Finite Element Analysis, FEA Beyond Basics: Nonlinear Analysis or FEA ... Finite Element Analysis (FEA) for Design Engineers WB1241. Overview. Topics/Outline. Requirements. Instructor. Registration ... The Finite Element Analysis (FEA) has been widely implemented by automotive companies and is used by design engineers as a tool ...
Use of the finite element software for more advanced structural, thermal analyses, and basic modal analysis ... Use finite element software for more advanced structural, thermal analysis and basic modal analysis ... Originally developed for aerospace structural analysis, Finite Element Analysis (FEA) is now a convenient and speedy tool for ... EL507 - Introduction to Finite Element Analysis has been added to your cart. ...
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Buy Finite Element Analysis by Saeed Moaveni from Waterstones today! Click and Collect from your local Waterstones or get FREE ... Finite Element Analysis: Theory and Application with ANSYS (Hardback). Saeed Moaveni (author) Sign in to write a review ... For courses in Finite Element Analysis, offered in departments of Mechanical or Civil and Environmental Engineering. While many ... Moaveni presents the theory of finite element analysis, explores its application as a design/modeling tool, and explains in ...
What salary does a Finite Element Analysis (Fea) Engineer earn in your area? ... 5 Finite Element Analysis (Fea) Engineer Salaries provided anonymously by employees. ... Finite Element Analysis (Fea) Engineer Salaries. Job Title. Salary. Zempleo Finite Element Analysis (Fea) Engineer salaries - 1 ... How much does a Finite Element Analysis (Fea) Engineer make?. The national average salary for a Finite Element Analysis (Fea) ...
The Finite Element Method in EEG/MEG Source Analysis. March 13, 2007 C.H. Wolters ...
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... how it works and the difference between FEA and the finite element method. Explore the advantages of FEA, its common ... applications and the principles behind the method and analysis. ... Continue Reading About finite element analysis (FEA) *Keith ... The finite element method is the numerical technique that is used perform finite element analysis. ... Various different types of tests are used during finite element analysis, such as:. *Structural static analysis. This type of ...
Finite- element analysis Friction in beam - to - beam contact beam-to-beam contact calculus finite element method finite ... Analyses in every chapter are illustrated with numerical examples showing the performance of derived contact finite elements. ... Therefore, its analysis has been a subject of many research efforts for a long time now. However, it is authors opinion that ... movement of machines and their elements, rolling or, finally, a numerical simulation of car crash tests, requires taking ...
"With finite element analysis, you break the model into literally finite pieces, each with a kind of mapped stiffness. Youre ... Improvements in latest finite element analysis (FEA) software help speed engineering analysis. ... breaking it into a finite element model, and the process of doing that is called meshing, creating a finite element mesh. If ... Long the domain of engineering specialists, finite element analysis software is reaching a wider audience as the tools become ...
3D Geotechnical Finite Elements Analysis software program to model, simulate, analyze and deploy staged construction in ... a finite element package that includes modules for vibration and groundwater analysis. Learn More ... this finite element package has what you need. Engineering companies and institutions in the civil and geotechnical engineering ... Perform three-dimensional analysis of deformation and stability in geotechnical engineering and rock mechanics with PLAXIS 3D. ...
Praktische Anwendung der Finite-Elemente-Methode und Ergebnisinterpretation. *Practical Introduction to Finite Element Analysis ... Non-Linear Finite Element Analysis. *Principes essentiels de la simulation des données et des processus de la simulation ... Employ an analysis system for the simulation of impact.. DVap7. Employ an analysis system for the determination of transient ... Discuss various approaches to Seismic Analysis and highlight relevant philosophy and analysis considerations. ...
Finite Element Analysis Applications in Biomechanical Studies of the Knee Joint. In: FEM Analysis of the Human Knee Joint. ... 2003). Finite element analysis of the meniscus: The influence of geometry and material properties on its behaviour. The Knee, ... 2005). Finite element analysis of the effect of meniscal tears and meniscectomies on human knee biomechanics. Clinical ... Bendjaballah, M. Z., Shirazi-Adl, A., & Zukor, D. J. (1997). Finite element analysis of human knee joint in varus-valgus. ...
Finite Elements in Analysis and Design. Check the Author information pack on Elsevier.com ... open.mendeley.com/use-citation-style/finite-elements-in-analysis-and-design. When preparing your manuscript, you will then be ... The aim of this journal is to provide ideas and information involving the use of the finite element method and its variants, ... The scope is intentionally broad, encompassing use of the finite element method in engineering as well as the pure and applied ...
... Gundeboina, Saidulu University of Skövde, School of Technology and ... Washing machine, Stress analysis, Finite Ellement Analysis National Category Computational Mathematics Identifiers. URN: urn: ... In this thesis a finite element model of a household washing machine cylinder is built and analysed in ABAQUS 6.9-2. The aim is ... The analysis is mainly concerned with an evenly distributed load at a constant angular velocity. The load is applied with the ...
Non-Linear Finite Element Analysis. *Principes essentiels de la simulation des données et des processus de la simulation ... Explain why finite element solutions tend to become unstable as the limit load is approached. ... an overview of the physics involved and show how to successfully implement practical solutions using Finite Element Analysis. ... Identify the algorithm used to follow highly nonlinear equilibrium paths in a finite element system. ...
Finite element analysis of elastohydrodynamic circular journal bearing with micropolar lubricants pp. 75-89(15) Authors: ... On the characterization of flexible pavement rutting using creep model-based finite element analysis pp. 49-73(25) Authors: ... The analysis of interpolation precision of quadrilateral elements pp. 91-108(18) Authors: Li, L. X.; Kunimatsu, S.; Han, X. P ... Derivation of the higher-order stiffness matrix of a space frame element pp. 15-30(16) Author: Chang, J. T. ...
Finite element analysis of beam structures based on trigonometric wavelet pp. 59-66(8) Authors: He, W. Y.; Ren, W. X. ... Three-dimensional finite element simulation of medium thick plate metal forming and springback pp. 49-58(10) Authors: Xu, H. J ... Modeling of wave propagation in one-dimension structures using B-spline wavelet on interval finite element pp. 1-9(9) Authors: ... Higher-order linked interpolation in quadrilateral thick plate finite elements pp. 67-80(14) Authors: Ribaric, D.; Jelenic, G. ...
Finite element analysis (FEA) is a method for predicting how a component/assembly will react to environmental forces, heat, ... The word "finite" in "finite element analysis" indicates that there are a finite number of elements in a model, such as a ... Finite Element Analysis Overview. Finite element analysis (FEA) is a computerized method for predicting how a component/ ... Finite element analysis, as related to the mechanics of solids, is the solution of a finite set of algebraic matrix equations ...
DESIGN OF RETINAL STENT USING FINITE ELEMENT ANALYSIS Razvan Rusovici, Michael Calhoun, Dennis Dalli, Michael Grace, Gary ... The study was performed via finite element analysis (FEA). The tissues were modeled with either hyperelastic or linear elastic ... Retinal stent, finite element, shape memory alloy, retina. Abstract. The motivation for the herein presented research stems ...
... Author(s). Lush, Allen M ...
... this book offers a short introduction to the general-purpose finite element program MSC Marc, a specialized program for non- ... The Finite Element Analysis Program MSC Marc/Mentat. Book Subtitle. A First Introduction. Authors. * Andreas Öchsner ... The Finite Element Analysis Program MSC Marc/Mentat. A First Introduction. Authors: Öchsner, Andreas, Öchsner, Marco ... Finite element analysis as well as the graphical interface Mentat is provided ...
"Abaqus 6.7 is the most scalable and powerful finite element analysis solution available on the market today. We expect these ... Dassault Systèmes Announces New Release for Unified Finite Element Analysis from SIMULIA. ... its technology-leading finite element analysis (FEA) software suite. Abaqus Version 6.7 introduces a new architecture for high- ...
Our work focuses on the development of finite element models (FEMs) that describe the biomechanics of human joints. Finite ... element modeling is becoming a standard tool in industrial applications. In highly complex problems such as those found in ... finite element analysis image processing meshing issue full potential high resolution x-ray ct scanner finite element modeling ... Finite Element Analysis Of Human Joints: Image Processing And Meshing Issues (1996) Cached. * ...
... Dongyang Shi,1 Hongbo Guan,1,2 and ... D. Shi, J. Ren, and W. Gong, "Convergence and superconvergence analysis of a nonconforming finite element method for solving ... G. Strang, "The finite element method-linear and nonlinear applications," in Proceedings of the International Congress of ... S. C. Brenner and L. R. Scott, The Mathematical Theory of Finite Element Methods, vol. 15, Springer, Berlin, Germany, 1994. ...
In the experiment using finite element simulation software to simulate and analyze. From the simulation results to analyze the ... Based on analysis, this article through the establishment of two-dimensional finite element model of porous elastic medium road ... With the aid of finite element simulation analysis software [7] , starting from the pressed material, the theory by simulating ... Yang, C. , Wei, R. , Yao, Y. and Wang, Q. (2018) Finite Element Simulation Analysis of Compressed Material in Intelligent ...
That is why computational mechanobiological analysis at the tissue level using the finite element method is very useful to ... With the analyses performed, it is possible to observe that the masticatory forces that act on the enamel are not transmitted ... In the present work, through the use of high-fidelity biomodels, computational mechanobiological analyses were performed on ... The analysis of the distribution of stress in dental organs is a poorly studied area. ...
  • Abstract: The 316L stainless steel stent was analyzed about the effect on interaction with plaque and vessels and blood flow during and after implantation using finite element method (FEM) and computational fluid dynamics (CFD). (scientific.net)
  • EL507 - Introduction to Finite Element Analysis has been added to your cart. (asme.org)
  • Buy Introduction to Finite Element Analysis and Design by Nam-Ho Kim from Australia's Online Independent Bookstore, Boomerang Books. (boomerangbooks.com.au)
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  • There are many other methods for solving PDEs with different features, but finite element methods are attractive both because they work well with complex geometries and because they are relatively simple to implement and analyze. (cornell.edu)
  • At Gannon, Dr. Steinbrink is responsible for undergraduate and graduate teaching in the areas of computational methods (including finite element analysis) and solid mechanics. (asme.org)
  • Finite element modeling mesh quality, energy balance and validation methods: A review with recommendations associated with the modeling of bone tissue. (springer.com)
  • Finite element methods are widely used in the field of Engineering and we can expect this technique of analysis to increase significantly in the years to come. (guru.com)
  • The use of finite element methods to design and analyze pressure vessels is a relatively recent development in the overall historical perspective of the ASME Code. (nationalboard.org)
  • In most finite element methods based on the Ritz-Galerkin approach, the degrees of freedom are endowed with a straightforward physical meaning, and shape functions are defined on the basis of individual degrees of freedom. (uni-kassel.de)
  • In established finite element methods, translations and rotations are assigned different degrees of freedom (d.o.f. (uni-kassel.de)
  • M. M. Verver, J. van Hoof, C. W. J. Oomens, J. S. H. M. Wis-mans and F. P. T. Baaijens, "A Finite Element Model of the Human Buttocks for Prediction of Seat Pressure Distributions," Computer Methods in Biomechanics and Biomedical Engi-neering, Vol. 7, No. 4, 2004, pp. 193- 203. (scirp.org)
  • The common geotechnical practice is to use modern numerical methods, such as the finite element method, differential method, and boundary element method. (thefreelibrary.com)
  • The finite element method is part of discrete analysis methods. (thefreelibrary.com)
  • Unlike other numerical methods, based on mathematical discretization of boundary problem equations, the finite element method is based on physical discretization of the observed area. (thefreelibrary.com)
  • The paper gives a bibliographical review of finite element methods applied for the analysis of fastening and joining from the theoretical as well as practical points of view. (scribd.com)
  • Finite Element Method (FEM) is one of the numerical methods of solving differential equations that describe many engineering problems. (boomerangbooks.com.au)
  • Smoothed finite element methods (S-FEM) are a particular class of numerical simulation algorithms for the simulation of physical phenomena. (wikipedia.org)
  • It was developed by combining meshfree methods with the finite element method. (wikipedia.org)
  • Finite element method Meshfree methods Weakened weak form Loubignac iteration Liu, G.R., 2010 Smoothed Finite Element Methods, CRC Press, ISBN 978-1-4398-2027-8. (wikipedia.org)
  • Smoothed finite element methods (S-FEM): An overview and recent developments. (wikipedia.org)
  • A general overview of Abaqus is presented followed by a demonstration of performing a linear static analysis of a cantilever beam using Abaqus. (3ds.com)
  • Finite element analysis software emerged in the 1970s with programs such as Abaqus, Adina and Ansys. (techtarget.com)
  • In this thesis a finite element model of a household washing machine cylinder is built and analysed in ABAQUS 6.9-2. (diva-portal.org)
  • Dassault Systèmes has released Abaqus 6.10-EF, under its SIMULIA brand banner, for finite element analysis (FEA) and multiphysics applications. (compositesworld.com)
  • Dassault Systèmes (Vélizy-Villacoublay, France) has released Abaqus 6.10-EF, under its SIMULIA brand banner, for finite element analysis (FEA) and multiphysics applications. (compositesworld.com)
  • EF also expands the capabilities of the Extended Finite Element Method (XFEM) in Abaqus, allowing users to predict crack growth due to low-cycle fatigue, such as with thermal analysis of the heating and cooling phase that occurs in an engine exhaust manifold. (compositesworld.com)
  • Euronext Paris: #13065, DSY.PA), a world leader in 3D and Product Lifecycle Management (PLM) solutions, announces the release of Abaqus Version 6.7, its technology-leading finite element analysis (FEA) software suite. (3ds.com)
  • Abaqus 6.7 is the most scalable and powerful finite element analysis solution available on the market today. (3ds.com)
  • The analyses include large-displacement effects, but linear material response for simplicity, and are performed with Abaqus 5.6 and Warp3D. (illinois.edu)
  • Microstructure-based cell models are created and linear-elastic, thermal and viscoplastic material properties are assigned for the finite element simulation in ABAQUS/Standard. (fraunhofer.de)
  • 2004). A new method to investigate in vivo knee behavior using a finite element model of the lower limb. (springer.com)
  • The software also includes a scalable, parallel-execution capability within the AMS eigensolver, which significantly accelerates the frequency extraction analyses required to study noise, vibration and harshness (NVH) behavior in vehicles. (compositesworld.com)
  • The behavior of each little element, which is regular in shape, is readily predicted by a set of mathematical equations. (npd-solutions.com)
  • The summation of the behavior of each individual element produces the expected behavior of the actual object. (npd-solutions.com)
  • Mathematics is used comprehensively for the analysis of structural or fluid behavior, thermal transport, wave propagation, the growth of biological cells, etc. (guru.com)
  • In the future study, computational fluid dynamics(CFD) should also be coupled in the analysis of the stent behavior in the artery. (actapress.com)
  • FEM Analysis for the Influence of manufacturing process Defects on Dynamic Behavior of Thin Chromium Microbeam. (ebscohost.com)
  • Our work on a finite element model of the skull of Macaca aims to investigate the functional significance of specific features of primate skulls and to determine to which of the input variables (elastic properties, muscle forces) the model behavior is most sensitive. (nih.gov)
  • These data suggest that in order to create an accurate and valid finite element model of the behavior of the primate skull at a particular instant during feeding, it is important to include estimates of the relative recruitment levels of the masticatory muscles. (nih.gov)
  • Unfortunately, the standard 8-node "brick" element with full integration exhibits strong shear-locking under bending deformations and thus overly stiff behavior. (illinois.edu)
  • S. M. Kim and S. Y. Park, "A Study on the Stent Expansion Behavior of the Human Artery Based on Finite Element Analysis", Key Engineering Materials, Vols. (scientific.net)
  • This paper describes the development of a finite-element model for the study of the structural behavior of monolimbs with different shank designs and the interaction between the limb and socket during walking. (edu.au)
  • In this paper, the influence of the microstructure of a cast aluminium alloy used for pistons in combustion engines on the local and global deformation behavior is investigated by means of microstructure-based cell models and the finite element method. (fraunhofer.de)
  • The elastic, macroscopic nearly isotropic material behavior is shown for 64 different microstructure-based cell models with 200 × 200 × 200 elements with microstructure-dependent material properties at room temperature. (fraunhofer.de)
  • You can use the results of finite element analysis to observe stress, strain, deformation, temperature, and heat flux and to predict whether a structure will fail or work the way it was designed during operation. (mathworks.com)
  • Perform three-dimensional analysis of deformation and stability in geotechnical engineering and rock mechanics with PLAXIS 3D. (bentley.com)
  • At Outsource2india, we have a team of qualified and experienced mechanical engineers who are capable of conducting various types of analysis such as structural (fatigue, strain, stress, and deformation), thermal (radiation, conduction and convection) fluid flow (velocity, pressure and flow) and coupled field analysis. (outsource2india.com)
  • 2.7 Finite Element Solution of Axial Deformation Problems. (whsmith.co.uk)
  • A class of first order hyperbolics related to the deformation of fluid particles are also treated numerically using finite elements with the balancing dissipation. (bl.uk)
  • A comparison of thin-plate spline deformation and finite element modeling to compensate for brain shift during tumor resection. (harvard.edu)
  • The FRANCO code is a quasi- static two-dimensional fuel rod analysis code, that calculates the fuel temperature and material deformation as a function of heat generation rate. (oecd-nea.org)
  • FRANCO uses two-dimensional finite element theory and applications for mechanical deformation and heat conduction, and determines the temperature distribution from the fuel center to the coolant adjacent to the clad at a position along the fuel rod axis. (oecd-nea.org)
  • Resolution degradation due to gradient coil deformation and vibration in NMR microscopy is investigated using finite element analysis. (caltech.edu)
  • Presented in five modules, the course emphasizes the various aspects of structural analysis. (asme.org)
  • Originally developed for aerospace structural analysis, Finite Element Analysis (FEA) is now a convenient and speedy tool for approximation of the solution to a wide variety of complicated engineering problems across a wide range of industries. (asme.org)
  • During the preprocess step, the user is asked to select the analysis type -- such as modal analysis or structural static analysis -- as well as the element type. (techtarget.com)
  • However, it is author's opinion that there are relatively few efforts related to contact between structural elements, like beams, plates or shells. (springer.com)
  • With FE modeling and analysis, product development engineers use mathematical-based modeling techniques to accurately describe how an automotive structural component or an aircraft engine or airframe will perform in the real world. (sme.org)
  • Finite element software traces its lineage back to the 1960s, when the US government developed the original NASA Structural Analysis System (NASTRAN) code for CAE simulation before releasing it into the public domain, noted Meintjes, who spent 30 years at GM in product engineering development. (sme.org)
  • Accurately model the construction process by activating and deactivating soil clusters and structural elements in each calculation phase with staged construction. (bentley.com)
  • Create cross-section curveplots from any arbitrary line cross section, structural element, or centerline generated from the structural forces in volume piles capability. (bentley.com)
  • We can provide you with linear and nonlinear analyses for a range of structural problems. (guru.com)
  • It is a sophisticated engineering tool, which has been used extensively in design optimization and structural analysis first originated in the aerospace industry to study stress in complex airframe structures. (intechopen.com)
  • For large-scale structural optimization problems the time and number of finite element analyses required to achieve the optimum solution can be prohibitive. (witpress.com)
  • Isoparametric curved elements with quadratic shape functions are used in this study to represent the structural geometries and the inner fluid domain variables. (oregonstate.edu)
  • The entire structure and stiffness of structural elements must be predefined for calculation according to the finite element method. (thefreelibrary.com)
  • Integrating Genetic Algorithms and the Finite Element Analysis for Structural Inverse Problems. (igi-global.com)
  • A general method for integrating genetic algorithms within a commercially available finite element (FE) package to solve a range of structural inverse problems is presented. (igi-global.com)
  • modeling of the entire test specimen-structural element with solid elements then proves convenient. (illinois.edu)
  • PERDUH, M and STRASHEIM, J A v B . Finite element analyses of the structural behaviour of pylons supporting an inclined coal conveyor . (scielo.org.za)
  • This paper describes how various finite element analyses of the structural behaviour of the pylons and the overall structure of the inclined coal conveyor were undertaken to assess wind and seismic actions. (scielo.org.za)
  • It will be shown that the simplified beam element models provide adequate modelling of the structural behaviour for this kind of structure. (scielo.org.za)
  • This paper reveals a non- linear finite element methodology to verify the structural integrity of a cylinder head during valve seat and valve guide assembly press-in operation under the maximum material condition, i.e., smallest hole size on cylinder head for valve seat and guide and largest diameter of valve seat and guide. (sae.org)
  • Finite element analysis is a method for solving partial differential equations (PDEs). (cornell.edu)
  • Finite element analysis provides numerical solutions to boundary value problems that model real-world physics as partial differential equations. (mathworks.com)
  • The finite element method (FEM) (sometimes referred to as finite element analysis) is a numerical technique for finding approximate solutions of partial differential equations (PDE) as well as of integral equations. (odu.edu)
  • From Wikipedia, the free encyclopedia This is a list of software packages that implement the finite element method for solving partial differential equations. (odu.edu)
  • The FEM creates a set of algebraic equations which engineers, developers and other designers can use to perform finite element analysis. (techtarget.com)
  • The original scope of the thesis was to design and perform finite element analysis (FEA) on the three main functions in the TTM. (bibsys.no)
  • In this study, in-vivo walking conditions were replicated in a kinematic model combining the finite element method with 3D walking analysis data divided into five phases in order to visualize the load transition on the SIJ and clarify the role of the SIJ. (fraunhofer.de)
  • While many good textbooks cover the theory of finite element modeling, this is the only text available that incorporates ANSYS as an integral part of its content. (waterstones.com)
  • Moaveni presents the theory of finite element analysis, explores its application as a design/modeling tool, and explains in detail how to use ANSYS intelligently and effectively. (waterstones.com)
  • An attempt has been made to study the possibility of designing rupture discs using Finite Element Analysis using ANSYS Software. (ansys.com)
  • The modeling blood vessels, stent, and plaque and was performed by analysis program, ANSYS(Ver 10.0). (actapress.com)
  • CAD modeling was done within the Autodesk Inventor, and stress and strain analysis was performed in the ANSYS software. (ebscohost.com)
  • D. Y. Shi and H. B. Guan, "A kind of full-discrete nonconforming finite element method for the parabolic variational inequality," Acta Mathematicae Applicatae Sinica , vol. 31, no. 1, pp. 90-96, 2008. (hindawi.com)
  • Our work focuses on the development of finite element models (FEMs) that describe the biomechanics of human joints. (psu.edu)
  • That is why computational mechanobiological analysis at the tissue level using the finite element method is very useful to achieve a better understanding of the biomechanics and the behaviour of dental tissues in various pathologies. (hindawi.com)
  • One of the most difficult tasks facing an engineer is to decide whether a nonlinear analysis is really needed and if so what degree of nonlinearity should be applied. (nafems.org)
  • Tunnels are often reinforced with transverse ribs, which can now be modeled as curved beam elements located at specific intervals in the 3D tunnel designer. (bentley.com)
  • In addition to its examination of numerous standard aspects of the finite element method, the volume includes many unique components, including a comprehensive presentation and analysis of algorithms of time-dependent phenomena, plus beam, plate, and shell theories derived directly from three-dimensional elasticity theory. (doverpublications.com)
  • Figure 2: Three-dimensional beam, subjected to given boundary conditions and kinematically modeled by the Logarithmic finite element method. (uni-kassel.de)
  • The entire beam is modeled by one single finite element only. (uni-kassel.de)
  • Are you up to speed on simply supported composite beam deflection analysis? (freelancer.co.uk)
  • Cook, R.D.: Beam elements on two-parameter elastic foundations. (springer.com)
  • They'll learn about one-dimensional finite elements, including truss and beam elements, as well as two and three dimensional finite elements. (boomerangbooks.com.au)
  • Beam, spring and mass elements were used to model the spine, viscera, head, pelvis and buttocks tissue in the mid-sagittal plane. (soton.ac.uk)
  • An application of the finite element method to a class of thermally coupled non-Newtonian viscous incompressible flow problems is attempted in the present work. (bl.uk)
  • The paper presents an application of the finite elements method for stress and strain analysis of the hot water boiler structure. (ebscohost.com)
  • In 1678, Robert Hooke set down the basis for modern finite element stress analysis as Hooke's Law. (npd-solutions.com)
  • This is the only equation one needs to know to understand linear finite element stress analysis. (npd-solutions.com)
  • DEINDE provides CAE and FEA services for the stress analysis, rotating components design and analysis. (guru.com)
  • The analysis of the distribution of stress in dental organs is a poorly studied area. (hindawi.com)
  • Furthermore, it is difficult to include thermal stress effects in a discontinuity analysis. (nationalboard.org)
  • The analyses were restricted to either plane stress, plane strain or, the most useful for the vessel designer, axisymmetric geometries. (nationalboard.org)
  • From this, stress and strain can be established in each element and the whole structure can be evaluated [ 1 ]. (intechopen.com)
  • 1.1.4 Triangular Element for Two Dimensional Stress Analysis. (whsmith.co.uk)
  • 1.4.3 Triangular Element for Two Dimensional Stress Analysis. (whsmith.co.uk)
  • Mechanical effects of MitraClip on leaflet stress and myocardial strain in functional mitral regurgitation - A finite element modeling study. (harvard.edu)
  • In this article, the author discusses theory of Finite Element Analysis through a graph which describes how a material would respond to the loading, in terms of its stress and strain, and also analyzes application of Hooke's law and Young's Modulus to structures. (ebscohost.com)
  • The purpose of this study was to evaluate, by means of the finite element method, initial tooth displacement and periodontal stress distribution using various mandibular anterior intrusion mechanics. (nih.gov)
  • Finite element studies were performed to assess initial tooth displacement and periodontal stress distribution with multiple intrusion force vectors. (nih.gov)
  • New finite elements, one 2 dimensional polar element and two 3 dimensional polar elements, are developed for the purpose of stress analysis around the crack in an axi-symmetric structure. (nii.ac.jp)
  • It is shown that the conventional constant stress and strain element brings about the loss of accuracy when applied to the crack in an axi-symmetric structure, because the nodal force vector deviates from the radial direction and that the ring element cannot be applied either because it cannot accomodate the circumferential displacement introduced by the crack owing to its original form of shape function. (nii.ac.jp)
  • Numerical examples of rotating bodies and of internally pressurized cylinders are analyzed and the high accuracy of these newly developed finite elements in evaluating stress intensity factors is confirmed. (nii.ac.jp)
  • Fracture resistance testing of the post/core/root complex, fracture analysis by microscopy and stress analysis by the finite element method were used for post evaluation. (scielo.br)
  • For the finite element method, specimens of the fracture resistance test were simulated by computer modeling to determine the stress distribution pattern in the post systems studied. (scielo.br)
  • The experimental post (original and modified versions) presented similar fracture resistance and better results in the stress analysis when compared with the commercial post systems tested (08/2008-PA/CEP). (scielo.br)
  • 8 (2001) and Henry 10 (1977), photoelastic stress and finite element analyses are valuable tools for the study of stress distribution related to intraradicular posts. (scielo.br)
  • Flexi Post presented a higher retention force (1180 N) than C-Post (171 N). Photoelastic analysis indicated minimal stresses for both post systems, but Flexi Post distributed stress more symmetrically than C-Post. (scielo.br)
  • selection of characteristic values of material parameters, * selection of the depth to which piles are driven, * stress-strain analysis of the structure using the finite element method and sizing of elements of the protective structure, * calculation of active pressures and equivalent forces acting on the pile wall. (thefreelibrary.com)
  • The current study utilizes images extracted from cryo imaging to render a 3D finite element model of a human coronary vessel to determine the stress and strain fields throughout an atherosclerotic plaque. (ahajournals.org)
  • Home Key Engineering Materials Advanced Biomaterials VI 3D Finite Element Analysis of Bone Stress around. (scientific.net)
  • Based on CT data and under the maximal load during a normal walking cycle, 3D finite element analysis (FEA) was carried out to analyze the stress of bone around the new implant in three cases of distally truncated femur at high position、middle-position and low-position. (scientific.net)
  • Finite element analysis of bone stress and strain around a distal osseointegrated implant for prosthetic limb attachment. (scientific.net)
  • Through finite element analysis (FEA) of stress distribution in bone around implant-bone interface, the advantages of this new implant (reducing stress concentration in cervical cortex and satisfying varieties of clinical needs) were verified. (scientific.net)
  • Thousands of companies routinely use NEi Nastran to perform linear and nonlinear stress, dynamic, and thermal FEA heat transfer analysis. (odu.edu)
  • A non-linear finite element model has been developed to analyse reinforced concrete structures taking into account : (1) non-linear concrete behaviour under biaxial stress, (2) progressive cracking of the concrete, and (3) interaction between the reinforcement and the concrete matrix commonly known as bond. (lboro.ac.uk)
  • The finite element model uses, an incremental iterative solution technique known as the 'Initial stress method' and a special solution technique to allow for cracking of the concrete. (lboro.ac.uk)
  • A finite element limit analysis (FELA) uses optimisation techniques to directly compute the upper or lower bound plastic collapse load (or limit load) for a mechanical system rather than time stepping to a collapse load, as might be undertaken with conventional non-linear finite element techniques. (wikipedia.org)
  • In order to make non-linear finite element analyses applicable during assessment of the global resistance of large concrete structures, there is need for a solution strategy with a low modelling uncertainty. (bibsys.no)
  • Non-Linear Finite Element Analysis of Valve Seats and Valve Guides Assembly in Engine Cylinder Head," SAE Technical Paper 2017-01-1090, 2017, https://doi.org/10.4271/2017-01-1090 . (sae.org)
  • For finite element analysis to perform its necessary simulations, a mesh -- containing millions of small elements that together form the shape of a structure -- must be created. (techtarget.com)
  • You're building up this CAD model, breaking it into a finite element model, and the process of doing that is called meshing, creating a finite element mesh. (sme.org)
  • In comparison to sequential finite element algorithms additional problems arise regarding mainly the data structure, the mesh refinement and the domain decomposition. (asce.org)
  • Finite Element Analysis" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (harvard.edu)
  • The finite element result is questionable unless it is obtained from converged mesh and. (ebscohost.com)
  • The displacements obtained with a refined mesh of thin shell elements provide the reference solution for evaluation of the solid element performance. (illinois.edu)
  • The essential idea in the S-FEM is to use a finite element mesh (in particular triangular mesh) to construct numerical models of good performance. (wikipedia.org)
  • One of the main problems in performing finite element analysis based on the need of the optimization routine is that the full potential of each analysis to achieve a complete picture of the design space is never realized. (witpress.com)
  • Prior studies show vertebral strength from computed tomography-based finite element analysis may be associated with vertebral fracture risk. (springer.com)
  • We aimed to determine the association between vertebral strength by quantitative computed tomography (CT)-based finite element analysis (FEA) and incident vertebral fracture (VF). (springer.com)
  • The equations that model the physics of these elements are then assembled into a larger system of equations that models the entire problem. (mathworks.com)
  • The main objectives of FEA and the major components of any finite element model are discussed. (3ds.com)
  • With finite element analysis, you break the model into literally finite pieces, each with a kind of mapped stiffness. (sme.org)
  • With Femap, users employ an array of tools that help to clean up geometry and help build a finite element model, he noted, and recent Femap releases added more automation to speed up the process. (sme.org)
  • 2016). Validation of predicted patellofemoral mechanics in a finite element model of the healthy and cruciate-deficient knee. (springer.com)
  • 2002). A finite element model of the human knee joint for the study of tibio-femoral contact. (springer.com)
  • To validate the model the numerical analyses are compared with experimental results. (diva-portal.org)
  • A finite element model for our shifter assembly was setup with reference of our corporate shifter test standards. (ansys.com)
  • The word "finite" in "finite element analysis" indicates that there are a finite number of elements in a model, such as a piston. (npd-solutions.com)
  • Using finite element analysis and the fuzzy logic for diaphyseal healing, the model simulated formation of woven bone in the fracture gap and subsequent remodelling of the bone to form trabecular bone. (nih.gov)
  • Conical shell elements were employed to model axisymmetric shapes. (nationalboard.org)
  • 1.4 Element Solutions and Model Validity. (whsmith.co.uk)
  • The non-linear effects were taken into account by defining the bilinear isotropic hardening model for all boiler elements. (ebscohost.com)
  • E. Wagnac, C. Aubin and J. Dansereau, "A New Method to Generate a Patient-specific Finite Element Model of the Human Buttocks," IEEE transactions on Biomedical Engi-neering, Vol. 55, No. 2, 2008, pp. 774-782. (scirp.org)
  • A finite element method which incorporates radiation boundary dampers is adopted to calculate the wave forces and other field variables in the direct interference model. (oregonstate.edu)
  • Finite-Element Analysis of Bone Stresses on Primary Impact in a Large-Animal Model: The Distal End of the Equine Third Metacarpal. (nih.gov)
  • FRANCO assumes the fuel-cladding gap region to be conductive material in order to simplify the analysis, and this gap is simulated by either an open gap or a closed gap model. (oecd-nea.org)
  • Principal coordinates analysis was used to compare the deformations of the model produced by the 36 loading regimes. (nih.gov)
  • A rectifier model is presented, which is integrated in a time stepping finite element simulation environment where the generator and circuit equations are solved simultaneously. (diva-portal.org)
  • Relatively large solid finite elements and a fully triaxial material model for concrete were used in the present work. (bibsys.no)
  • Based on CT scan data, relatively accurate model of femur for finite element analysis (FEA) were obtained. (scientific.net)
  • The finite element model used in this study may help in designing the stent. (scientific.net)
  • In order to improve the general understanding of coronary stenting, finite element method (FEM) has been used to model the revascularization of a stenosed artery through the insertion of a balloon-expandable stent. (scientific.net)
  • Our main product, NEi Nastran, is a powerful, general purpose Finite Element Analysis (FEA) tool with an integrated graphical user interface and model Editor. (odu.edu)
  • A two-dimensional model of human biomechanical responses to whole-body vibration has been developed, by using the finite element method. (soton.ac.uk)
  • These programs utilized constant strain quadrilateral and triangular elements. (nationalboard.org)
  • 1.1.2 Triangular Element for Two Dimensional Heat Flow. (whsmith.co.uk)
  • 1.4.2 Triangular Element for Two Dimensional Heat Flow. (whsmith.co.uk)
  • The cross sectional plane geometry of fuel rod is modeled using three-node constant strain triangular finite elements, and both thermal and mechanical solutions are computed with the same finite element configurations. (oecd-nea.org)
  • A typical workflow in finite element analysis includes importing or creating a geometry, meshing the geometry, applying boundary and initial conditions, solving, and postprocessing results. (mathworks.com)
  • With these calculations, we obtain ultimate states of bearing capacity in terms of characteristic values of parameters of soil and structure and characteristic geometry of elements of the structure, anchor and strut, which are considered as linear elastic elements with regard to actual characteristic stiffness. (thefreelibrary.com)
  • FRANCO analyses only a quarter of fuel rod cross-sectional area because azimuthal symmetric geometry is assumed for fuel pellet, gap, and clad. (oecd-nea.org)
  • For courses in Finite Element Analysis, offered in departments of Mechanical or Civil and Environmental Engineering. (waterstones.com)
  • The finite element is a small, but not infinitesimal, part of the mechanical structure being modeled. (npd-solutions.com)
  • It enables the mathematical conversion and analysis of mechanical properties of a geometric object with wide range of applications in dental and oral health science. (intechopen.com)
  • For each element, its mechanical behaviour can be written as the function of displacement of the nodes. (intechopen.com)
  • We apply the concept of finite elements not only on the fine, but also on the coarse grid, thus making it possible to describe the mechanical properties not only of a complete SCNT configuration, but also of its components, in a concise way, and to reveal the scaling laws associated with the self-similarities that characterize super carbon nanotubes. (uni-kassel.de)
  • Hopefully, this bibliography will save time for readers looking for information on finite element analyses of mechanical fastening and joining. (scribd.com)
  • We have carried out three-dimensional finite element analysis (FEA) to determine the physical and mechanical response in several ocular injuries. (dovepress.com)
  • This paper applies plastic-strain-range memorization based on time-independent cyclic plasticity theory for butt joints with single V-groove Finite Element (FE) models that were manufactured by GMAW. (mdpi.com)
  • More complicated elements include quadrilateral plates, curved shells, and 3D solids such as hexahedrons (bricks). (npd-solutions.com)
  • Mohapatra D, Kumar J. Collapse loads for rectangular foundations by three‐dimensional upper bound limit analysis using radial point interpolation method. (wikipedia.org)
  • The shape functions therefore become multi-dimensional embeddings in the physical domains on the respective finite elements, generally spanning the dimensions associated with multiple degrees of freedom. (uni-kassel.de)
  • The three-dimensional interference problems have been formulated by incorporating a fictitious bottom boundary in the finite element functionals. (oregonstate.edu)
  • The validity of the present finite element algorithms, both in two- and three-dimensional formulations, are studied extensively. (oregonstate.edu)
  • The versatility of the present three-dimensional finite element algorithm is clearly demonstrated in the design analysis of a loading/unloading facilities, where important interference phenomena are identified. (oregonstate.edu)
  • We compared impact stresses in subchondral bone between two subject-specific, three-dimensional, finite-element models of the equine metacarpophalangeal (MCP) joint-one with advanced OA and one healthy, and with similar published data on the stresses that occur at midstance. (nih.gov)
  • Three-dimensional finite element analyses of all-ceramic posterior fixed partial dentures with different designs. (diva-portal.org)
  • Three-dimensional finite element models of posterior 3-unit all-ceramic FPDs were created with and without periodontal ligaments, with different radii of curvature at the embrasure area, and in a curve shape with a periodontal ligament. (diva-portal.org)
  • The present paper is devoted to the analysis of three dimensional fatigue crack propagation using advanced experimental, imaging, measurement and numerical simulation techniques. (archives-ouvertes.fr)
  • Discuss the limitations of contact algorithms available in a finite element system. (nafems.org)
  • I have a assignment in algorithms with requires good knowledge of algorithm time complexity analysis and discrete mathematics. (freelancer.co.uk)
  • This report compares experimental modal parameters obtained by impact testing with analytical modal parameters obtained by NASTRAN finite-element analysis. (psu.edu)
  • Design engineers analyze their own designs while they are still in the form of easily modifiable CAD models to allow for quick turnaround times and to ensure prompt implementation of analysis results in the design process. (sae.org)
  • This course addresses the needs of design engineers who are not specialized analysts but need to use the Finite Element Analysis to analyze new product during the design process. (sae.org)
  • In the experiment using finite element simulation software to simulate and analyze. (scirp.org)
  • Finite Element Analysis (FEA) or Finite Element Method (FEM) is a computer-based numerical method to analyze the structure based on the principle of dividing a structure into a finite number of small elements that are connected with each other at the corner points called nodes. (intechopen.com)
  • In this method, the ensiled materials are characterized as nonlinear viscoelastic, the friction mechanism at the silo wall-fill material interface is realstically represented taking into consideration the slip-stick phenomenon, and a nonlinear finite element formulation is used to analyze the silo wall-fill material interaction. (concrete.org)
  • To compare the results of a simulated fall on the greater trochanter in the proximal portion of a synthetic femur before and after femoral reinforcement with tricalcium phosphate bone cement (TP) and polymethyl methacrylate (PMMA), using finite element analysis (FEA). (scielo.br)
  • This work reports some numerical analysis of hip prostheses and the design of an screw-based system prototype for fixation of head-femur fractures. (witpress.com)
  • The technique has been used most significantly in the field of soil mechanics for the determination of collapse loads for geotechnical problems (e.g. slope stability analysis). (wikipedia.org)
  • FEA uses the finite element method (FEM), a numerical technique that cuts the structure of an object into several pieces, or elements, and then reconnects the elements at points called nodes. (techtarget.com)
  • The Finite Element Analysis (FEA) is the replication of any physical phenomenon using the numerical technique called Finite Element Method (FEM). (guru.com)
  • Finite Element Method (FEM) is a numerical technique which is used in FEA by simulating a given physical phenomenon. (guru.com)
  • The instructor recommends that students purchase Concepts and Applications of Finite Element Analysis , 4th Ed, (2002), by Robert D. Cook et al. (asme.org)
  • 2002). Simulation of a knee joint replacement during a gait cycle using explicit finite element analysis. (springer.com)
  • R. Ragan, T. W. Kernozek, M. Bidar and J. W. Matheson "Seat-Interface Pressures on Various Thicknesses of Foam Wheelchair Cushions: A Finite Modeling Approach," Archives of Physical Medicine and Rehabilitation, Vol. 83, No. 6, 2002, pp. 872-875. (scirp.org)
  • Explain the terms Implicit Solution and Explicit Solution for the time integration of the equations of motion and the appropriate associated problem classes of dynamic analyses. (nafems.org)
  • Finite element analysis, as related to the mechanics of solids, is the solution of a finite set of algebraic matrix equations that approximate the relationships between load and deflection in static analysis and velocity, acceleration, and time in dynamic analysis. (npd-solutions.com)
  • When a computer analysis is performed on this, a system of simultaneous equations can be solved to relate all forces and displacement of the nodes. (intechopen.com)
  • 1.1 Discretization and Element Equations. (whsmith.co.uk)
  • 1.2 Assembly of Element Equations. (whsmith.co.uk)
  • Therefore, the basic equations used to describe the state in individual elements, and to formulate the problem as a whole, are ordinary algebraic equations (algebraic polynomials) instead of differential or integral ones. (thefreelibrary.com)
  • I use existing codes where appropriate, but have released several finite element software packages for simulating problems from MEMS design and analysis of human bone . (cornell.edu)
  • This paper will describe how a general purpose Finite Element Analysis (FEA) software can be used to develop inserted tooling designs. (sae.org)
  • Long the domain of engineering specialists, finite element analysis software is reaching a wider audience as the tools become easier to use and more accessible to non-expert users. (sme.org)
  • I can perform a wide array of computer simulations and analysis used state-of-the-art software, techniques and equipment. (guru.com)
  • Based on simple examples, this book offers a short introduction to the general-purpose finite element program MSC Marc, a specialized program for non-linear problems (implicit solver) distributed by the MSC Software Corporation, which is commonly used in academia and industry. (springer.com)
  • Today the documentation of all finite element programs includes a variety of step-by-step examples of differing complexity, and in addition, all software companies offer professional workshops on different topics. (springer.com)
  • Is Subject software a Finite Element Method (FEM) solver or a Finite Volume Method (FVM) solver? (eng-tips.com)
  • this is dedicated to the analysis of stresses and deformations in tissues in living beings. (hindawi.com)
  • Due to this, analysis of the distribution of stresses generated by occlusal or masticatory loads, in a biological system such as the teeth, is a complex problem [ 7 ], because of the nature of the tissues of the dental organ, such as nonhomogeneous materials and the geometric irregularities of their contours and anatomical forms. (hindawi.com)
  • how to do a linear extrapolation of stresses from integration points to the nodes in wedge element (6 nodes)? (eng-tips.com)
  • By using the finite element method, the FEM program evaluates stresses and strains in soil around a structure and stability of the structure. (thefreelibrary.com)
  • Lostado Lorza R, Corral Bobadilla M, Martínez Calvo MÁ, Villanueva Roldán PM. Residual Stresses with Time-Independent Cyclic Plasticity in Finite Element Analysis of Welded Joints. (mdpi.com)
  • The principal stresses, which represent maximum and minimum stresses within an element, result from Mohr's circle relationship between normal stresses. (oecd-nea.org)
  • The objective of this current study is to investigate the stresses in the subchondral femoral bone at different stages of cyst progression using finite element analysis. (ku.edu)
  • Finite element analysis (FEA) is a computational method for predicting how structures behave under loading, vibration, heat, and other physical effects. (mathworks.com)
  • Employ an analysis system for the determination of response in a range of linear and nonlinear systems, to random vibration. (nafems.org)
  • Finite element analysis (FEA) is a computerized method for predicting how a component/assembly will react to environmental factors such as forces, heat, and vibration. (npd-solutions.com)
  • The purpose of this study was to investigate the effects of varying vertical vibration frequencies on seat-interface contact pressure during sitting on three different seat cushions by using a finite element modeling approach. (scirp.org)
  • 2012). Dynamic finite element knee simulation for evaluation of knee replacement mechanics. (springer.com)
  • Early evaluation of nuclear vessels was performed using discontinuity analyses. (nationalboard.org)
  • This paper presents simple expressions, based on this method of analysis, for evaluation of lateral and vertical pressures as well as capacities of top unloading, well-drained, circular farm silos storing corn sifage. (concrete.org)
  • D. Y. Shi, S. P. Mao, and S. C. Chen, "A class of anisotropic Crouzeix-Raviart type finite element approximations to the Signorini variational inequality problem," Chinese Journal of Numerical Mathematics and Applications , vol. 27, no. 1, pp. 69-78, 2005. (hindawi.com)
  • The results of theoretical numerical analysis for these approximations are briefly summarized and a few possible modifications to improve the numerical performance are suggested. (bl.uk)
  • Hands-on exercises focusing on the analysis of FEA errors and proper modeling techniques will be assigned. (sae.org)
  • Moreover, modeling of simple and more complex processes as nailing, cutting, vacuum pressing, movement of machines and their elements, rolling or, finally, a numerical simulation of car crash tests, requires taking contact into account. (springer.com)
  • Explicit finite element modeling of total knee replacement mechanics. (springer.com)
  • Detailed finite element modeling for different buildings and bridges structures including soils modeling. (guru.com)
  • Finite element modeling is becoming a standard tool in industrial applications. (psu.edu)
  • Finite Element Analysis (FEA) modeling is numerical analysis of a problem to identify an approximate solution without performing physical tests and experiments. (coorstek.com)
  • This present paper presents the modeling and simulation of the thermal transfer in the transformers from the high electric voltage stations using finite element method. (ad-astra.ro)
  • Mixed 8 and 20-node element meshes for ductile fracture analyses with transition elements to maintain displacement compatibility are demonstrated to provide an accurate and efficient modeling strategy. (illinois.edu)
  • Trabecular bone fracture healing simulation with finite element analysis and fuzzy logic. (nih.gov)
  • For the analysis of fracture resistance, 40 bovine teeth were randomly assigned to the four groups (n=10) and used for the fabrication of test specimens simulating the situation in the mouth. (scielo.br)
  • This report examines the performance of various "solid" finite elements for the analysis of thin shell structures often encountered in nonlinear fracture mechanics studies. (illinois.edu)
  • Element performance is assessed through analyses of a thin M(T) fracture specimen loaded in remote tension. (illinois.edu)
  • Diaphragm should be calculated as elastic linear elements with constant stiffness. (thefreelibrary.com)
  • Selvadurai, A.P.S.: Elastic analysis of soil-foundation interaction. (springer.com)
  • stiffnesses within elements are evaluated by numerical integration using Gaussian Quadrature, with elastic moduli stored at the sampling positions. (lboro.ac.uk)
  • For these structures, with a limited number of design variables the ability of determining a performance parameter over the full range of the design variable variation with a small number of finite element analyses can be very valuable. (witpress.com)
  • In this paper, results are presented of nonlinear simulations performed to analyse the interactions between the stent and artery or plaque using finite element method. (actapress.com)
  • 9] Auricchio F., Loreto MDI, Sacco E., Finite-element analysis of a stenotic artery revascularization through a stent insertion. (scientific.net)
  • Identify the contact facilities available in a finite element system, including friction models. (nafems.org)
  • Finite element analysis (FEA) is the use of calculations, models and simulations to predict and understand how an object might behave under various physical conditions. (techtarget.com)
  • On the Lie algebra, which is, by its mathematical construction, a vector space, rotations can be represented as translations, and it is this aspect which makes this approach particularly interesting for finite-element calculations that involve the modelling of rotations. (uni-kassel.de)
  • To reveal the piezoelectric property of ZnO nanohelices, the piezoelectric potential in single-crystal nanohelices was simulated by finite element method calculations. (mdpi.com)
  • Directed toward students without in-depth mathematical training, the text incorporates introductory material on the mathematical theory of finite elements and many important mathematical results, making it an ideal primer for more advanced works on this subject. (doverpublications.com)
  • With the analyses performed, it is possible to observe that the masticatory forces that act on the enamel are not transmitted to the dentin and to the bone and periodontal ligament to protect the nerve, as it happens in a healthy dental organ. (hindawi.com)
  • Finite element analyses to study periprosthetic bone adaption. (scientific.net)
  • Finite element method finds application in the analysis of FRP composites due to its versatility in getting the solution for complex cases which are not possible by exact classical analytical approaches. (ebscohost.com)
  • The analytical models will be analyzed and corrected using finite element method (FEM) to determine their validity under influence of. (ebscohost.com)
  • The programs are based on the analytical calculation method and finite element method (FEM), Figure 1. (thefreelibrary.com)
  • Finite Element Analysis with Mathematica and Matlab Computations and Practical Applications is an innovative, hands-on and practical introduction to the Finite Element Method that provides a powerful tool for learning this essential analytic method. (whsmith.co.uk)
  • Finite element method computations of the FEM program established that our sheet pile wall was unstable without support, i.e. without a strut. (thefreelibrary.com)
  • Finite element analysis emerged as a way for computers to solve both linear and nonlinear PDEs. (techtarget.com)
  • However, for a computer to solve these PDEs numerical techniques have been developed and one of the prominent ones, today, is the Finite Element Analysis. (guru.com)
  • Data presented in this paper will explain the computer models and analysis iterations used to develop optimal inserted tooling designs. (sae.org)
  • and research assistantship at the University of Cincinnati Simulation Center for Procter & Gamble where he developed finite element musculo-skeletal human models. (3ds.com)
  • 3D CAD models, analytic and numeric scientific analysis and scientific computation in Mathematica, Maxima, and other common applications. (guru.com)
  • In the present work, through the use of high-fidelity biomodels, computational mechanobiological analyses were performed on four molar models affected with four different degrees of caries, which are subjected to masticatory forces. (hindawi.com)
  • CoorsTek Research & Development engineers use strong collective experience to create accurate data models, perform predictive analysis, and to make expert recommendations. (coorstek.com)
  • It focuses on modelling the behaviour of the concrete pylons during the construction period, a comparison between finite element models (FEMs) with different complexities and the implications of simplifying the FEMs. (scielo.org.za)
  • T. Zhang and C. J. Li, "Finite element approximation to the second type variational inequality," Mathematica Numerica Sinica , vol. 25, no. 3, pp. 257-264, 2003. (hindawi.com)
  • Every object vibrates at a frequency , so it is important to use modal analysis to test how disruptive external vibrations affect the product's structure. (techtarget.com)
  • This text is geared toward assisting engineering and physical science students in cultivating comprehensive skills in linear static and dynamic finite element methodology. (doverpublications.com)
  • 2.7.1 Two Node Uniform Bar Element for Axial Deformations. (whsmith.co.uk)
  • From the analysis, deformations due to the Lorentz force can be as large as 1-10 μm depending on the gradient strength and coil frame material. (caltech.edu)
  • Other authors bibliographies in connection with the analysis of pressure vessels and piping, where FEMs are applied, can be found in Refs. (scribd.com)
  • Some new designs of biomedical devices, obtained by using numerical analysis based upon the Finite Element Method (FEM) are presented and discusssed. (witpress.com)
  • These features make cryo-imaging an attractive approach for rendering high-resolution 3D volumes that serve as a basis for finite element analysis (FEA) studies of plaque rupture. (ahajournals.org)
  • Identify the algorithm used to follow highly nonlinear equilibrium paths in a finite element system. (nafems.org)
  • No matter what types of elements, the extrapolation algorithm is identical. (eng-tips.com)
  • It allows you to create a single curveplot to compare how the settlements at the surface level evolve for multiple phases, or to compare the bending moment along the length of a diaphragm wall or tunnel lining (either modeled as plates or volume elements) across multiple phases simultaneously. (bentley.com)
  • The influence of the diamond film thickness (in the range of 1 μm to 50 μm) on the properties of the AlGaN/GaN diaphragm is studied by finite element simulation method (FEM). (spie.org)
  • Prior to the development of FEA tools, engineers employed integral and differential calculus techniques to solve engineering analysis problems. (npd-solutions.com)
  • 3.2 Finite Element Formulation for Second Order 1D BVP 3.2.1 Complete Solution Procedure. (whsmith.co.uk)
  • The Finite Element Analysis (FEA) has been widely implemented by automotive companies and is used by design engineers as a tool during the product development process. (sae.org)
  • Also non-specialist FEA users, R&D engineers and managers, project engineers, and product engineers will benefit from its coverage of different FEA formulations, tools for error analysis, common errors, traps and misconceptions, and an introduction to FEA project management. (sae.org)
  • Finite element analysis provides the safe simulation of potentially dangerous or destructive load conditions and failure modes, allowing engineers to discover a system's physical response at any location. (techtarget.com)
  • Designers and engineers who have some familiarity with dynamic analysis. (nafems.org)
  • The study was performed via finite element analysis (FEA). (actapress.com)