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 31 for “"Stress gradient"”.
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Effect of residual stress gradients in austenitic stainless steels on stress corrosion cracking
The effect of the residual stresses developed during simulated weld heat affected zone in austenitic stainless steel specimen on the stress corrosion cracking susceptibility was studied. Residual stresses was measured using X-ray diffraction technique. Boiling Magnesium Chloride was used as …
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Residual stresses and mechanical properties of thin film photovoltaic materials
The mean and gradient residual stresses and the failure behavior of individual layers in inorganic thin film photovoltaics were investigated. The thin film photovoltaics consisted of an amorphous silicon (Si) p-n junction diode, a zinc oxide (ZnO) Transparent Conductive Oxide (TCO) layer (each 1μm …
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The electromechanical effect in bone
… postulating a polarization proportional to the gradient of the stress was proposed. The present work is concerned with a further examination of the applicability of the stress gradient theory to both dry and wet bone. Our measurements on dry bone samples cut from a bovine tibia indicate that the …
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Fatigue limit analysis involving biaxial stress components
Biaxial stress fatigue data is carefully examined in order to determine how much foundation exists for a rational approach to classical stress-based fatigue limit analysis involving biaxial stress components. A review is given of the methods presently in vogue, and new methods are suggested for …
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ALUMINUM SCANDIUM NITRIDE (AlScN) FILMS FOR MICROELECTROMECHANICAL SYSTEMS (MEMS)
… (5G) cellular technology. Various internal stress arise during the process for developing AlScN films. Abnormal Ori- ented Grains (AOGs) are undesired grains that grow in the off c-axis in AlScN films resulting in reduced electromechanical coupling, reduce device performance, and produce …
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A simulation model for stress measurements in notched test specimens by x-ray diffraction
An analytical model was developed to simulate the stress state of notched tensile specimens. Actual experiments are being carried out by other investigators to study the relaxation of residual stresses in specimens containing stress raisers. In the present work, the stress state developed in …
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Thermo-mechanical behavior of silicon at nanoscale — an in situ investigation
… strength of silicon samples incorporated with stress gradient and material characteristic of silicon due to strong covalent bond. For theoretical study of the size dependent yield behavior, we have employed an isotropic elastic continuum based model. The model shows that stress concentration …
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Applying ecological models to positive interactions among lotic fishes: implications for population and community regulation at multiple spatial scales
… cavity nesting vertebrate communities) and the stress gradient hypothesis (previously applied almost exclusively to plant communities) for predicting which associate species spawn on nests built by various nest building species, and the consequences of these choices, respectively; and (3) using …
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Drift-diffusion of a vacancy in inhomogeneous media and its material constants : a Fokker-Planck equation approach with an application to foreign exchange data
… media in one dimension under a directed stress. The study used the general master equation as a basis for a physical model because of the mesoscopic view that the change in average concentration is inadequate to describe small fluctuations in a system and that a probabilistic approach is …
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Cross-shelf circulation and momentum and heat balances over the inner continental shelf near Martha's Vineyard, Massachusetts
… and bottom pressure; surface gravity waves; wind stress; and heat flux between the ocean and atmosphere during 2001-2007. When waves are small, cross-shelf wind stress is the dominant mechanism driving cross-shelf circulation. The along-shelf wind stress does not drive a substantial cross-shelf …
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Bragg grating filters for optical networks
… since its bandwidth also changes with the stress gradient, it has also been utilised as a bandwidth-variable bandpass filter at the receiving terminal of a spectrum-sliced wavelength-division multiplexed system.
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Characterization of high cycle fatigue and laser-aided machining and polishing of additively manufactured materials
… with increased surface area and uniform stress distribution within gauges captures a large population of surface and subsurface defects, reduces the stress gradient effect, maintains symmetric loading, minimizes material and test equipment costs, and decreases sample preparation and test …
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Cross-shelf circulation and momentum and heat balances over the inner continental shelf near Martha's Vineyard, Massachusetts
… and bottom pressure; surface gravity waves; wind stress; and heat flux between the ocean and atmosphere during 2001-2007. When waves are small, cross-shelf wind stress is the dominant mechanism driving cross-shelf circulation. The along-shelf wind stress does not drive a substantial cross-shelf …
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Evaluation of fiber-matrix interfacial shear strength in fiber reinforced plastics
… in a new theoretical treatment (that combines stress gradient shear-lag theory with Weibull statistics) to evaluate "interfacial shear strengths". The fact that results did not correlate with the short beam data was examined in detail via a combination of polarized light microscopy, electron …
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Computational analysis on stent geometries in carotid artery
… on parameters namely time averaged wall shear stress (TAWSS), time averaged wall shear stress gradient (TAWSSG), oscillatory shear index (OSI), relative residence time (RRT) and flow separation parameter (FSP). Meanwhile, Pictorial Selection Method was used to evaluate the best haemodynamic …
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Excitons in cuprous oxide: high mobilities and strain confinement
… .An externally applied inhomO'::feIl-""'Ous stress gradient was used to provide the motive force for the mobility measurement. Very large values of D (~ 1000 2 7 2 cm Is) and 11 (-10cm /eV-s) were measured at a bath temperature of 1.2 K. Both these parameters exhibited anomalous temperature …
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Thermoelastic stress analysis of laminated composite materials
In this work thermoelastic stress analysis (TSA) is used to obtain quantitative stress/strain data from a variety of multi-directional laminated composites. In order to interpret the thermoelastic signal correctly the source of the thermoelastic response has been investigated in detail. In this …
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Development of a High-Throughput 3D Tumor Model for Bone Sarcomas
… that increasing levels of flow-derived shear stress promoted the secretion of insulin-like growth factor-1 (IGF-1) which, in turn, resulted in shear stress-dependent cell sensitivity to the IGF-1 receptor (IGF-1R) blockade, a central player in ES progression. We then leveraged these findings …
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Residual Stress Effects on Power Slump and Wafer Breakage in GaAs MESFETs
… a precise, non-destructive single crystal stress measurement technique, develop a model to explain the phenomenon known as 3power slump2, and investigate the role of device processing on wafer breakage. All three objectives were successfully met. The single crystal stress technique uses a …
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Bending Of Metallic Thin Foil Via High Energy Pulsed Laser Peening
… of components byimparting beneficial residual stresses on the surface of the material. First, a review of theparameters of LPF processing, the forming mechanisms, process modeling techniques, andalternative LPF methods is discussed, to understand the procedures of industrialmanufacturing …
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