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 57 for “"applied strain"”.
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The Effects of Applied Strain and Heat Treatment on the Properties of NiTi Wire During Shape Setting
… This study investigates the effects of applied strain of 0-10% and heat treatments of 300-600ºC for times of 2-30 minutes during shape-setting of Ti–50.8 at% Ni wire with a nominal diameter of 0.495 mm and an initial transition temperature, Af, of 12ºC. Strain was applied prior to heat …
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Numerical study of solder joint failure under fast loading conditions
… is devoted to deformation under relative high strain rates (1-100 s-1), mimicking those frequently encountered in drop and impact loading of the solder points. The effects of applied strain rate and loading mode on the overall ductility and failure pattern were specifically investigated. It was …
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Deformation, yield, relaxation and recovery in partially processed leather
… in uniaxial tests by measuring the stress-strain relationship, the immediate and recovered set and stress relaxation. The influence of moisture content, time under strain and applied strain were determined. The effect of drying under strain was also explored. Results were interpreted using …
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Multiscale Modeling of CNT-Polymer Nanocomposites and Fuzzy Fiber Reinforced Polymer Composites for Strain and Damage Sensing
… effect, that is to say that changes in applied strain may induce measurable changes in resistance. The first focus of the work is on modeling the piezoresistive response of the CNT-polymer nanocomposites by using computational micromechanics techniques based on finite element analysis. …
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Ferroelectric Barium Titanate Nanowires: Synthesis, Properties, and Device Applications
… by a periodically varying tensile mechanical strain applied with a precision mechanical testing stage. The measured voltage generation from the nanowire was found to be directly proportional to the applied strain rate, and was successfully modeled through consideration of an equivalent circuit …
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The Effect of Local Conditions on Deformation Processes in Low Stacking -Fault Energy FCC Alloys
… at room temperature under quasi-static and high strain rate compression. Post-mortem analysis of the deformed microstructures at different levels of applied strain reveals the nucleation of deformation twins is affected by the grain size distribution of the bulk material. In these materials, …
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Plastic deformation of gallium arsenide
… of temperature induced effects to the plastic strain rate . The dislocation densities in the deformed samples obtained by counting dislocation etch pits indicate that the density of dislocations in deformed GaAs is directly related to the applied stress, the plastic strain rate, the test …
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Characterization of Nb₃Sn superconducting strand under pure bending
Characterizing the strain-dependent behavior of technological Nb₃Sn superconducting strand has been an important subject of research for the past 25 years. Most of the effort has focused on understanding the uniaxial tension and compression effects and applying this information to improve …
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Second order nonlinearities in silicon photonics
… waveguides are studied. At the beginning, the strained silicon platform is investigated in detail. In recent years, second order nonlinearities have been demonstrated on this platform. However, the origin of these nonlinearities was not clear. This thesis offers a clear answer to this question, …
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Raman spectroscopy: from ferroelastic domain identification to strain tuning
… by epitaxially, mechanically or piezoeletrically applied strain. Methods for quantitative determination of strain by Raman spectroscopy are proposed for some materials such as BiFeO3 or strained Si. Raman spectroscopy was also used for understanding temperature induced phase transitions or orbital …
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Alloying effects on high-temperature deformation behavior of nickel aluminide intermetallics
… vs. MO).;The specimens were tested at constant strain rates ranging from 10 -6 to 10-3 s-1. At high temperatures, the flow stress becomes dependent on strain rate. The materials were evaluated by comparing the flow stress at various applied strain rates. The testing temperatures ranged from …
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Mechanical and electrical fatigue of aerosol jet printed conductors
… conductor aging on silicon as a result of applied strain has the potential to result in the formation of cracks along a printed conductor which serves to inhibit continuity in a printed device.'
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Comparison of Additively Manufactured and Wrought 17-4 PH Stainless Steels in Ultra Low Cycle Fatigue
… dissipate seismic energy through large plastic strains; however, the ultra low-cycle fatigue performance of AM metals are not yet well understood. Void formation during the AM fabrication process has potential to affect performance. This study compares the performance of heat-treated and …
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Mechanics of fatigue damage in titanium-graphite hybrid laminates
… seams is related via a power law to the applied strain energy release rate. It is shown that elevated temperatures significantly increase the growth rate of facesheet delamination. The facesheet crack growth behavior in TiGr laminates was measured experimentally and compared to model …
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Mechanochromism and Strain-Induced Crystallization in Thiol-yne-derived Stereoelastomers
<p>Most elastomers undergo strain-induced crystallization (SIC) under tension; as individual chains are held rigidly in a fixed position by an applied strain, their alignment along the strain field results in a shift from strain-hardening (SH) to SIC, a sub-type of SH. A similar degree of …
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Kinetics of Plastic Flow in Polycrystal Plasticity
… that considers the kinetics of plastic flow. Strain rate and temperature dependencies, included in the single crystal constitutive response, are based on the isotropic mechanical threshold stress continuum model. A modified power law is used to determine slip system activity without …
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Mechanical Behavior of Adhesive joints Subjected To Thermal Cycling
… polymers, and thermal stresses induced in a constrained system. Due to the complexity of developing a closed-form solution for a system with time, temperature, material properties, and boundary conditions all coupled, numerical techniques were used to acquire approximate solutions. Descriptions …
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Development of a Miniature, Semi-Distributed Sapphire Fiber Optic Thermometer for Harsh and High Temperature Environments
… from cross sensitivity of the thermometer with applied strain. This work has been variously funded by Pratt & Whitney and the Department of Energy.
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Mechanical behavior of individual type I collagen fibrils
… and cyclic loading/recovery experiments, and strain rate tests spanning six decades of strain rates in the range 10-3 – 102 s-1. Experiments were conducted with reconstituted type I calfskin collagen fibrils which were isolated from buffer and after drying were adhesively attached to a …
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Atomistic simulation of defect structure evolution and mechanical properties at long time scales
… a particular focus on the coupled effects of strain rate and temperature. The thesis provides original contributions to the fundamental understanding of how the materials mechanical properties change, as manifested by defect structure evolution, with temperature and strain rate conditions, as …
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