• The results from mechanical testing are evaluated involving microscopic characterization of the material before and after testing in order to investigate changes such as deformation, damage, crack growth, and failure. (dlr.de)
  • Notable results are that the resistance recovers after unloading and continues to recover after removal from loading frame, under cyclic loading the resistance can improve due to grain growth, and the development of an in-situ-squared experiment where the electrical resistance and deformation/cracking are combined into the same experiment. (oeaw.ac.at)
  • It is indicated that the stress, deformation, permeability and porosity of rock were changed after the oil reservoir in rock mass was fractured, which led improvement of productivity. (onepetro.org)
  • Next, the influences of various parameters such as Poisson's ratio, internal pressure (mud weight), dilation angle, and out-of-plane stress are studied in terms of stress and deformation responses of wellbore. (geoengineer.org)
  • Poisson's ratio does not have an appreciable influence on the tangential stress, radial stress and radial deformation. (geoengineer.org)
  • Some important visco-elastic and visco-plastic features, such as rate-dependent and temperature-dependent stress-strain curves and nonuniform temperature distribution were experimentally investigated, and the interaction between the mechanical deformation and the internal heat generation was discussed. (intechopen.com)
  • The critical UZHUG is 2 m considering coal pillar deformation and stress transfer characteristics. (hindawi.com)
  • In this project, atomistic simulations will be used to complement in-situ experiments to gain insights in the fundamental deformation mechanisms at the nanoscale. (imechanica.org)
  • Thus, the bone behavior is related to the stress and deformation induced on it. (bvsalud.org)
  • Through experiments (in-situ AFM, XRD, 4PP) and simulations, it was observed that when cracks formed in the brittle adhesion layer, these cracks act as stress concentration sites for the overlying film. (oeaw.ac.at)
  • Abstract Simulations using the finite element method (FEM) were done to understand the effects of heating/cooling rates on the distribution of residual stresses. (scielo.br)
  • Polyaxial (or true triaxial) simulations highlighted the effect of the intermediate principal stress (σ2) on fracture directions in the model: as the intermediate principal stress increased, fractures tended to align in the direction parallel to the plane defined by the major and intermediate principal stresses. (geoengineer.org)
  • The artificial neural network simulations show that for the rock types examined, none were independent of intermediate principal stress effects. (geoengineer.org)
  • In combining similar simulation experiments and numerical simulations, some scholars have researched the stress distribution law and the stability of coal pillars in upper coal seam mining in old goafs [ 27 - 31 ]. (hindawi.com)
  • In this paper, mechanical response of short fiber reinforced lattice structures under compression is investigated through experiments and numerical simulations. (ornl.gov)
  • As simulations on fiber-reinforced lattices under large compressive strains are rarely performed and published, finite element models accounting for fiber orientation induced anisotropic mechanical properties and geometrical imperfections were developed to predict the stress-strain characteristics up to 30% compressive strains. (ornl.gov)
  • The stress-strain curves predicted from the numerical simulations matches well with the experimental responses for various lattice geometries. (ornl.gov)
  • The design of the prosthesis was extensively modified using findings from functionality tests on cadavers, FE analyses, MRB simulations (figure 1) and in vitro experiments (figure 2). (empa.ch)
  • These experiments allowed for the electro-mechanical behavior of metal films on polymer substrates to be examined. (oeaw.ac.at)
  • The interface structure responsible for the improved electro-mechanical behavior without an interlayer is still under investigation. (oeaw.ac.at)
  • A particular focus is provided on unique mechanical and electrical behavior that can be achieved in the limit of such intimate molecular mixing. (mrs.org)
  • The mechanical behavior of metallic nanostructures differs dramatically from their bulk counterparts. (imechanica.org)
  • The successful candidate must have a solid background in solid state physics and mechanical behavior of materials. (imechanica.org)
  • This study was developed as part of an effort by the National Institute for Occupational Safety and Health (NIOSH) to better understand rock-mass behavior in longwall coal mines in highly stressed, bump-prone ground. (cdc.gov)
  • To overcome the limitations of the FLAC3D model, 3DEC modeling in conjunction with the discrete fracture network (DFN) technique was performed to better understand the true behavior of floor heave associated with underground mining in an anisotropic stress field. (cdc.gov)
  • Advances must be made in the relationship between film adhesion, mechanical properties and fracture which are currently poorly understood for metal films on compliant polymer substrates in order to provide the basic understanding required for design guidelines. (oeaw.ac.at)
  • Harsh irradiation at laser energies up to 4 J/cm 2 was only possible due to localized treatment without significant vibrations occurring on the freestanding samples that led to fracture in preliminary experiments at energies as low as 0.16 J/cm 2 . (scirp.org)
  • We probe the mechanical and fracture properties of hybrids in the extreme limits of molecular confinement, where a stiff inorganic matrix phase confines polymer chains to dimensions far smaller than their bulk radius of gyration. (mrs.org)
  • The effect of increasing confining pressure on the mechanical response and fracture propagation of the rock was quantified under triaxial compression tests. (geoengineer.org)
  • For example, elastomer seals in the oil and gas industry are required to withstand compressive stresses in the range of 100 to 140 MPa and temperatures in the range of 0 to 180 °C, without undergoing microstructural damage and loss of elasticity (that is, permanent set). (confex.com)
  • In-situ stress measurements during tensile straining, in two directions, to determine yield stresses and buckling stresses were also performed. (oeaw.ac.at)
  • Nanowires, particles or thin films can have yield stresses of the order of the theoretical strength and significantly modified elastic properties. (imechanica.org)
  • Mechanical Testing of Materials offers mechanical material characterization as scientific-technical service for all departments of the institute as well as for external customers. (dlr.de)
  • Mechanical material characterization is performed also in co-operations with universities, other research institutions, and industry partners. (dlr.de)
  • This objective was complimented by integrating mechanical characterization using CT imaging into image-based microstructural finite element (FE) modeling. (uwaterloo.ca)
  • Two recent efforts on mechanical characterization of ductile polymeric thin films are presented. (4spe.org)
  • The mechanical testing laboratory owns several servo-hydraulic testing machines for uniaxial and biaxial loading, electro mechanical testing machines for different load ranges, mechanical resonance testing machines for cyclic loading at high frequencies, and constant load test rigs. (dlr.de)
  • Films cracked more with an interlayer thus reducing the electro-mechanical functionality. (oeaw.ac.at)
  • Accordingly, it has been used extensively in the field of micro-electro-mechanical systems (MEMS). (scirp.org)
  • The influences of loading rate and peak strain on the shape memory effect (SME) and shape memory degeneration of TSMPs were revealed under monotonic and cyclic thermo-mechanical loadings, respectively. (intechopen.com)
  • This talk will present the results of cyclic loading experiments to characterize polymer‒filler and filler‒filler interactions in crosslinked butadiene copolymers filled with carbon black and other fillers. (confex.com)
  • Based on experimental observations, the capability of recent developed visco-elastic and visco-plastic models for predicting the SME was evaluated, and the thermo-mechanically coupled models were used to reasonably predict the thermo-mechanical responses of TSMPs. (intechopen.com)
  • However, the mechanism of mechanical stress in the formation of collagen remains unclear. (hindawi.com)
  • Therefore, we investigated the relationship between mechanical stress and collagen synthesis in the present study. (hindawi.com)
  • Previous studies [ 6 - 9 ] have shown that mechanical stress promotes collagen I (col-I) and collagen III (col-III) synthesis which contributes to LFH. (hindawi.com)
  • One putative - but yet unproven - mechanism is the mechanical denaturation (unravelling) of collagen. (uwaterloo.ca)
  • In silico experiments have suggested that collagen does denature under mechanical stresses. (uwaterloo.ca)
  • Mechanically stimulated gas emission Mechanically stimulated gas emission (MSGE) is a complex phenomenon embracing various physical and chemical processes occurring on the surface and in the bulk of a solid under applied mechanical stress and resulting in emission of gases. (wikipedia.org)
  • Due to the mechanically dynamic operations of such electronics, their mechanical reliability must be thoroughly investigated to understand their failure mechanisms and lifetimes. (mrs.org)
  • The uniaxial strain compression test, also referred to as isentropic compression experiment, was analyzed using a simple basically analytical model. (epj-conferences.org)
  • Mechanical material tests are performed under various loads, which can be uniaxial but also biaxial. (dlr.de)
  • The 3D FDEM was first calibrated against standard laboratory experiments, including Brazilian disc test and uniaxial compression test. (geoengineer.org)
  • The determination of the parameters of linear and nonlinear viscoelastic models using uniaxial tension and compression experiments on these composites will also be discussed. (confex.com)
  • The solution is obtained for rock mass exhibiting elastic-perfectly plastic or elastic-brittle-plastic behaviour considering in-plane isotropic stresses. (geoengineer.org)
  • The constitutive relations between rock porosity, permeability and effective stress are studied theoretically based on elastic theory and capillary structure of porous medium. (onepetro.org)
  • The capillary will deform elastically with the internal and external stresses according to elastic theory. (onepetro.org)
  • For the first time, phenolic formaldehyde resin (PF)-treated silica carbon black (SiCB) were prepared with different treatment conditions and their effect as fillers on the mechanical properties of filler filled natural rubber/butadiene rubber (NR/BR) composites were investigated in detail. (mdpi.com)
  • As a result, both the cross-link density and mechanical properties of the obtained composites were effectively enhanced. (mdpi.com)
  • Thermal expansion or contraction in mechanical components and structures occurs due to temperature changes in the operating environment. (mathworks.com)
  • Thermal stress is a secondary manifestation: the structure experiences stresses when structural constraints prevent free thermal expansion or contraction of the component. (mathworks.com)
  • test facility for investigating thermal gradient mechanical fatigue of protective coating systems for gas turbine blades by using hollow specimens, which are heated by using a radiation furnace and internally cooled with pressurised air. (dlr.de)
  • In past SCEC research we documented inhomogeneous flash-temperatures, T, at the mm-scale with thermal imaging during high-speed, rock-on-rock friction experiments. (scec.org)
  • Through thermal modeling we determined the spatial variation of local normal stress and of local µ on the sliding surfaces. (scec.org)
  • Topics range from theoretical explanations of 2- and 3-D stress and strain to practical applications such as torsion, bending, thermal stress, and wave propagation through solids. (doverpublications.com)
  • In this paper, the above problem were carefully investigated based on rock mechanic experiments and mathematical simulation. (onepetro.org)
  • Recent advances in nano-manipulation, environmental TEM and MEMS allow us to investigate coupled mechanical and electrochemical phenomena with unprecedented spatial and temporal resolutions. (mrs.org)
  • This paper reports on a setup and a method that enables the automated analysis of mechanical stress impact on MEMS devices. (vde-verlag.de)
  • In addition, the relationship of mechanical stress and IGF-1 in LFH as well as the potential mechanism involved was investigated. (hindawi.com)
  • established a continuous deep beam mechanical model to reveal the failure and instability mechanism of the overburden in roadway goaf, and they proposed a feasible method for mining the upper coal seam in roadway goaf. (hindawi.com)
  • Our findings suggest that fine PM enhances allergic inflammatory response in pulmonary tissue through mechanisms involving increased oxidative stress. (cdc.gov)
  • We also investigate the phase stability in native powder, as-built and annealed Ti-5553 through diamond anvil cell (DAC) and ramp compression experiments. (sandia.gov)
  • The use of additional gaseous protection (N2) modifies the welding parameters while modifying the microstructure, influencing the mechanical properties of the deposits. (scielo.br)
  • However, occipital morphology does not figure in the mechanical analyses reported here. (nature.com)
  • Additionally, Finite Element (FE) Analyses of the shoulder prosthesis system and design optimization of the components with respect to stress and wear were performed. (empa.ch)
  • The relations between porosity, permeability and stress/strain of rocks were studied by experiment, and reservoir stress field was simulated. (onepetro.org)
  • The examples show that this model is feasible for simulating parameters of stress-strain, porosity and permeability along time and across space. (onepetro.org)
  • Assessment of energy absorption properties and damping at relatively high strain rates is essential for the practical application of innovative materials and components in both civil and mechanical engineering. (surrey.ac.uk)
  • Bone has the capacity to respond to mechanical stress and strain. (cornell.edu)
  • While these processes are well recognized at the scale of the whole bone, they have never been studied at the scale of individual bone cells, making it unclear what mechanical stimuli are most influential in controlling bone adaptation (strain, fluid shear, etc). (cornell.edu)
  • The student will write software to perform three-dimensional image registration to spatially associate bone formation with tissue and fluid mechanical stress and strain (achieved from high-resolution finite element models). (cornell.edu)
  • These pore defects can serve as stress concentrators and compromise the mechanical properties of the part. (llnl.gov)
  • Besides machines with smaller load capacity and high accuracy, modified hardness test machines are employed for exploring local mechanical properties. (dlr.de)
  • This has an influence on the inner and therefore on the mechanical properties of the part. (4spe.org)
  • We describe a new nanoscale design principle using hyperconnected molecular architectures to achieve remarkable mechanical properties controlled by designing connectivity into the intrinsic molecular structure in innovative ways. (mrs.org)
  • We particularly encourage novel contributions based on laboratory and underground near-fault experiments, numerical modeling, the spatio-temporal relationship between seismic properties, injection/extraction parameters, and/or geology, and fieldwork. (copernicus.org)
  • Several studies have investigated mechanical properties of various lattices made up of mostly unreinforced polymers and lack numerical analysis for reinforced lattice structures. (ornl.gov)
  • holding pressure on flame properties of a Lexan* grade of polycarbonate so that we can eliminate/ reduce the effects of molding parameters during flame testing This was done by first investigating the effect of post molding residual stress on flame properties. (4spe.org)
  • It was observed that the such properties of are influenced by the post- molding residual stress profile built-in the bars and that such profile is in-turn influenced by the processing conditions. (4spe.org)
  • Tendon tissue storage and preconditioning are often used in biomechanical experiments and whether this generates alterations in tissue properties is essential to know. (lu.se)
  • Therefore, we investigated if storage of healing tendons in the fridge or freezer changed the mechanical properties compared to fresh tendons, using a pull-to-failure or a creep test. (lu.se)
  • Yttrium-stabilized tetragonal zirconia (Y-TZP) is having increased use in dentistry due to its good mechanical properties. (bvsalud.org)
  • The results showed that there was a concentration of vertical residual stresses in the web region, while the presence of horizontal compression residual stresses was mostly superficial in the rail head region. (scielo.br)
  • ISR is associated with excessive damage to the vessel wall and with disturbed flow patterns in the stented vessel, in particular with low values of wall shear stress (WSS). (springer.com)
  • The results indicated that the shear stress value and distribution layout in the coal pillar were affected by the UZHUG. (hindawi.com)
  • The larger the UZHUG, the greater the shear stress and the wider the distribution scope, moving from two sides to the middle zone. (hindawi.com)
  • More recently, we conducted a series of high-speed experiments on grooved surfaces in a double-direct shear configuration that achieves ~30 mm of high-speed slip at a macroscopic normal stress of 9 MPa. (scec.org)
  • Atomic force microscopy (AFM) and Raman spectroscopy were also used to assess surface roughness, crystallinity changes and surface stresses developing on surfaces subjected to perpendicular laser irradiation. (scirp.org)
  • These experiments greatly complement our modeling efforts, and together they help provide insights into how materials are transformed in synthesis and how they behave in service due to combined electrochemical-mechanical forces. (mrs.org)
  • Single crystal silicon freestanding structures for tensile and fatigue testing were treated with KrF excimer laser to improve surface roughness and accordingly mechanical performance. (scirp.org)
  • We study the plants' systems for control of growth, development, transport and metabolism, and their responses against environmental stresses, both abiotic and biotic. (lu.se)
  • In the case of a structural analysis, the quantities of interest can be the maximum displacement, stress, or deflection angle. (comsol.com)
  • To adapt to the dynamic change in mechanical stress, the constitutive individual proteins need to reversibly stretch and recoil over long periods of time. (rsc.org)
  • Tissue force and stress were unaltered by storage and preconditioning compared to fresh samples, while high preconditioning increased the stiffness and modulus (p ≤ 0.007). (lu.se)
  • In conclusion, preconditioning on healing tissues can introduce mechanical data bias when having extensive tissue strength diversity. (lu.se)
  • Experiments on the phantoms showed that this water jet indentation method was reliable to map the tissue stiffness distribution. (who.int)
  • The abutment angulation is a mechanical variable in implantology3 that may influence the internal and external structure of bone tissue 3 . (bvsalud.org)
  • To address problems associated with mining above gob piles in the Chinese midwest mining area, a mechanic model for a coal pillar was established based on the displacement variation method. (hindawi.com)
  • A series of four coal combustion experiments was conducted at the National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory in the Safety Research Coal Mine to evaluate the response of optical and ionization smoke and CO sens. (cdc.gov)
  • The effect of stress rotation in the mining-induced stress field was considered by using a different geometry of rock fractures in the coal seam. (cdc.gov)
  • These mechanical characteristics were found to be strongly anisotropic as a function of the orientation of the cleats relative to the loading direction. (cdc.gov)
  • Experiments on explanted hearts suggested a trigger for coronary artery inflammation: Where flow is perturbed, hemodynamic stress results in local mechanical injury allowing the entry of blood cells into the arterial intima, triggering inflammation-driven atherogenesis . (medpagetoday.com)
  • So it is necessary to study the coupling multiphase fluid flow and in situ stress to get better reservoir simulation. (onepetro.org)
  • The validation procedure uses data from porcine in vivo experiments, by simulating stent deployment using stent geometry obtained from micro computed tomography (micro-CT) of the stented vessel and directly comparing the simulation results of neointimal growth to histological sections taken at the same locations. (springer.com)
  • Through carefully designed experiments that replicate the manufacturing process, researchers at Lawrence Livermore National Laboratory ( LLNL ) have previously unveiled many of the complex mechanisms that can drive defect formation and limit part quality in metal 3D printing . (llnl.gov)
  • The complex interaction between injected fluids, subsurface geology, stress interactions, and resulting fault slip requires an interdisciplinary approach to understand the triggering mechanisms, and may require taking coupled thermo-hydro-mechanical-chemical processes into account. (copernicus.org)
  • Yet, the molecular mechanisms controlling the mechanical unfolding and refolding of proteins cannot be accessed by protein folding biochemistry experiments conducted in the bulk, because they cannot typically apply forces to individual proteins. (rsc.org)
  • Lund University researchers find that individual blood stem cells (depicted as snowflakes in this image) express stress-related transcripts when subjected to experimental procedures involving cell incubation at elevated temperatures. (lu.se)
  • Suspecting that experimental procedures used during gene expression analysis might be influencing the results, they examined how stress-related genes behaved in cells collected under different conditions. (lu.se)
  • Single cell experiments [ 11 ] could provide iterative validation of models with experimental results. (lu.se)
  • This can include research on high/ultra-high-strength and highly ductile materials and components, steel and polymeric mechanical joints (welded, riveted, bonded), sustainable concrete materials, as well as the initiation of buckling, and failure of thin shells, among others. (surrey.ac.uk)
  • Wellbore and tunnel in depth are generally in true triaxial stress state, even if the ground is under axisymmetric loading condition. (geoengineer.org)
  • We developed a biomimetic approach to separate and characterize slow quasi-static and fast vibrational stress signals acting on a whisker base in realistic exploratory phases, using experiments on both real and artificial whiskers. (frontiersin.org)
  • To normalize differences in laboratory testing conditions, the stress state is used as the objective parameter in the artificial neural network model predictions. (geoengineer.org)
  • The film stress was measured parallel and perpendicular to the straining direction to determine delamination stresses. (oeaw.ac.at)
  • Recent advances in experiments and models of thermo-induced shape memory polymers (TSMPs) were reviewed. (intechopen.com)
  • It can be rolled, twisted, folded, or cut into any shape with no loss of mechanical integrity or electrical efficiency. (rpi.edu)
  • Presented in this paper is a theoretical review of the relationships that should exist between electrical winding parameters and the mechanical vibration of a-c machine elements under normal and faulted operating conditions. (cdc.gov)
  • These sites house both small and large specialized labs where researchers study heavy machinery, mechanical and electrical systems, ergonomic and biomechanic challenges, geological stresses, explosions, illumination, chemistry, dust control, and a host of other mining safety and health challenges. (cdc.gov)
  • This review focuses on the fundamental operational principles of the main single-molecule nanomechanical techniques, placing particular emphasis on the most common analytical approaches used to extract information directly from the experiments. (rsc.org)
  • In summary, these results suggested that mechanical stress promotes LFCs to produce IGF-1, which facilitates col-I and col-III synthesis via the IGF-1R/AKT/mTORC1 signaling pathway. (hindawi.com)
  • The results of the parametric study reveal that variation in the out-of-plane stress has an inverse relation with the radius of plastic zone. (geoengineer.org)
  • The effects of the intermediate principal stress on the intact rock strength are investigated and compared with laboratory results from the literature. (geoengineer.org)
  • Results: Implant Von Mises stress level was negligibly changed with increasing abutment angulation. (bvsalud.org)
  • Moreover, increased IGF-1 promotes hypertrophy of various tissues [ 14 - 17 ], and mechanical stress plays a vital role in IGF-1 formation [ 18 , 19 ]. (hindawi.com)
  • To create physiological stress, the researchers asked volunteers to plunge their forearms into ice water for three minutes. (nationalgeographic.com)
  • According to a recent study by researchers from the Lund Stem Cell Center at Lund University, published in Nature Aging, the genetic changes previously observed in aging blood stem cells could be linked to cell extraction stress rather than the aging process itself. (lu.se)
  • IGF-1, col-I, and col-III were significantly increased in stressed LFCs compared to nonstressed LFCs. (hindawi.com)
  • The role of film thickness, grain size and the use of an interlayer were investigated with these experiments. (oeaw.ac.at)
  • Preliminary peridynamics modeling of the dynamic experiments is described. (sandia.gov)
  • using a mechanical agitation (using a vortex shaker) because of their extremely low bulk density (Maynard et al. (cdc.gov)
  • When we looked at our data, we noticed a pattern of stress-induced changes in gene activity, especially in cells exposed to higher temperatures during isolation," explains David Bryder, Professor of Molecular Hematology at Lund University, and research group leader at Lund Stem Cell Center. (lu.se)
  • The differences between stressed and unstressed groups were small, but nevertheless notable, says Amy Arnsten , a professor of neurobiology at Yale who was not involved in the work. (nationalgeographic.com)
  • For experiments on very small specimens a new testing laboratory has been established. (dlr.de)
  • Deflection of a bimetallic beam is a common physics experiment. (mathworks.com)
  • Additional subjects include beam columns, curved bars and arches, buckling of rings, and experiments and design formulas. (doverpublications.com)
  • This has been studied with experiments and finite element modeling. (oeaw.ac.at)
  • We demonstrate here that mechanical evidence provides insights into the dietary adaptations of Australopithecus sediba that could not have been obtained from dietary reconstructions that do not consider functional anatomy. (nature.com)
  • Such measurements are however difficult in real conditions, since head/body movements and whisking produce complex stress signals. (frontiersin.org)
  • Plants grown under microgravity conditions typically display evidence of stress. (nasa.gov)
  • We further explore the stress and fault conditions that may allow for these diverse behaviors using an earthquake simulator, RSQSim. (copernicus.org)
  • This paper was developed as part of an effort by the National Institute for Occupational Safety and Health (NIOSH) to identify risk factors associated with bumps in the prevention of fatalities and accidents in highly stressed, bump-prone ground conditions. (cdc.gov)
  • The ideas involved are important not only from the point of view of modelling real electronic circuits but also because many complicated processes in biology, medicine and mechanical engineering are themselves modelled by electric circuits. (sheffield.ac.uk)
  • MISSE-15 NASA is one of a series of investigations on Alpha Space's Materials ISS Experiment Flight Facility , which is testing how the space environment affects the performance and durability of specific materials and components. (nasa.gov)
  • The new equipment aims at expanding the testing capabilities of the Department of Civil and Environmental Engineering and the School of Mechanical Engineering Sciences in the Faculty of Engineering and Physical Sciences, to cover drop weight impact testing of sustainable materials and components, non-existent to date. (surrey.ac.uk)
  • Highly qualified candidates with academic education in physics, materials science, mechanical engineering or related disciplines are invited to apply. (imechanica.org)
  • Figure 3: In-situ straining with XRD measurements allow for the stress in the thin films to be measured, even of multilayer films. (oeaw.ac.at)