Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Strain/stress"”.
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Dominant singularity and finite element analyses of plane-strain stress fields in creeping alloys with sliding grain boun[d]aries
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Tensile Fracture Mechanisms of Ferritic/martensitic Structural Materials
… hypothesis of the association between critical stress and critical interfacial strength, but also offer a new method to determine the true strain/stress behavior during deformation. This method is called the Universal Micro-structural Geometry-corrected Model (UMGM) in this dissertation. Due to …
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Effects of Laser Shock Peening on Residual Stress, Texture and Deformation Microstructure of Ti-6Al-4V Alloy
… process that generates deep compressive residual stresses and microstructural changes and thereby dramatically improves fatigue strength of critical metal aircraft engine parts. In the past, researchers have evaluated the mechanical effects of LSP experimentally through residual strain/stress …
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Dynamic actuation properties of Ni-Mn-Ga ferromagnetic shape memory alloys
Dynamic magnetic-field-induced strain actuation of up to 3% with a frequency bandwidth of least 500 Hz in Ni48.5Mn29.5Ga21 ferromagnetic shape memory alloys (FMSAs) is achieved. Hardware was designed and constructed to measure frequency bandwidth, magnetic-field-induced strain, stress and …
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An analysis of the relationship between organizational culture and occupational stress: Perceptions of employees following a merger
… the physiological and psychological effects of stress resulting from the increasing concern about occupational stress. This study attempts to fill an identified gap within epidemiologic literature by examining whether organizational culture has an influence on the level of occupational stress, …
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Estudo de membranas elásticas quadradas suportadas pelos vértices
… laboratory. The results of deflection and stresses on several points of the membrane are shown and analysed through the Theory of Elasticity. It is also presented an easy way to find the longitudinal modulus of elasticity of the membrane material through laboratory experiments and it is …
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Fibrous Microstructure and Biomechanics of Healthy and Diseased Aortic Tissues
… can be captured by the material constants in the strain energy density function. Additionally, high material heterogeneity was characterised by the localised strain maps and simulations. Strain maps of axial strips demonstrated a zebra pattern with vertical high strain concentrations due to fibre …
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Exploring the Physiological Role of Vibrio fischeri PepN
… Colonization assays revealed the pepN mutant strain to be deficient at forming dense aggregates and populating the host’s light organ compared to wildtype within the first 12 hours of colonization; however the mutant competed normally at 24 hours. To address the role of PepN in colonization …
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Synthesis, structure and magnetic properties of nanowires and films by electrodeposition
… been investigated in detail. It shows that the strain/stress during electrodeposition is attributed to the highly orientated metallic nanowires. In addition, NiCo, NiCu, CoCu, and FePt wires have also been successfully fabricated. The layer and bamboo structure in NiCo gives the possibility to …
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Finite element simulation of electrorheological fluids
… case of the heterogeneous ER fluid. Also, shear stress-strain rate relation of ER fluid was simulated in case of shear modes and pressure modes in both fluids; heterogeneous and homogeneous fluid. Also, the simulated shear strain-stress relationship was compared with experimental results.
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The mechanics of mechanotransduction : analyses of cell perturbation
… provided a robust tool for analysis of detailed strain/stress fields induced within a single cell or cell monolayer produced by forcing one tethered microbead. On the assumption of structural homogeneity, stress and strain patterns were highly localized, suggesting that the effects of …
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Design of Variable Stiffness Composite Panels for Maximum Strength
… compared to the classical approaches such as the strain, stress, and energy methods. The load path function method is also expanded upon to solve the problem of non-homogenous equilibrium equations. This method allows load paths to be determined for more complicated loads such as aerodynamic …
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Impact of a Mentoring Program on Occupational Stress, Personal Strain, and Coping Resources of Newly Appointed U.S. Magistrate Judges
Problem. Judges experience occupational stress that manifests itself in physical and mental strain. Stress can be reduced by actual or perceived social support, such as mentoring. Procedures. Using a quasi-experimental design, this research investigated the results of a project that offered paired …
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High temperature deformation mechanisms and strain heterogeneities in calcite rocks
… carbonates often accumulate large amounts of strain in localized shear zones. Such marble sequences play a key role in crustal deformation processes. Despite extensive field and laboratory investigation, many questions remain concerning the mechanical behavior of these rocks. For example, the …
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Study of creep characteristics of multi-layered corrugated fibre board protective cushions
… that can be adapted with respect to static strain, stress or stiffness and can be fitted to creep data. Curve fitting with a non-linear optimisation technique shows the model has a reasonable fit with experimental data. Creep data and curve fitting shows an unexpected trend in that as the …
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Design, fabrication and testing of a fiber optic stress/strain sensor for soft stretchable materials using polarization imaging technique
… modified and used for noninvasive sensing of strain and stress in soft stretchable materials, such as latex and human tissues. Previously this sensing method was developed with free space bulk optics. In this study, a fiber optic based system is developed to investigate the potential …
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The behaviour of sand at low stress levels in the simple-shear apparatus
… sand (<No.14 and) No.25 BS sieves) at low stress levels 1n the simple shear apparatus is presented and discussed in detail. In a close examination of data from the Mark 6 simple shear apparatus built by Bassett (1967) and modified by Cole (1967), significant nonuniformities are shown to …
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Fatigue stiffness loss and life prediction technique development of a real rubber automotive component by means of Finite Element Analysis
… and cyclic deformation behaviours, knowledge of stress/strain histories, the fatigue life and failure plane associated with the nucleation of cracks and their subsequent growth, fatigue damage quantification parameters, cycling control type, influence of density and size of cracks. Material …
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Design and Performance of Intrinsic Self-sensing Cementitious Composites for Smart Structural Health Monitoring of Civil Infrastructure
… composites can intrinsically sense the strain, stress and damage by calibrating the variations of the electrical signal, and often possess other functionalities (i.e. electromagnetic interference shielding and self-heating) with brilliant application prospects such as structural health …
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Dynamic soil modeling in site response and soil-large pile interaction analysis
… site response analysis for small and large strains. The first formulation introduces an approach to construct a frequency-independent viscous damping matrix which reduces the over-damping at high frequencies, and therefore, the filtering at those frequencies. The second formulation …
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