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 99 for “"stress distributions"”.
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Stress distributions around hydrofoils using computational fluid dynamics
This research describes the reciprocal influence between two foils, vertically and horizontally oriented, on each other for different gaps between them. Those cases are the focus part of a bigger process of lowering significantly the drag of a ship when hydrofoils are attached to its hull. The …
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Ultra-high pressure composite vessels with efficient stress distributions
… For the anisotropic composite materials the stresses through the wall thickness tend to fall much more rapidly than with their isotropic metallic counterparts. This effect leads to a greatly reduced vessel efficiency quotient PV / W . To date, little is understood about the phenomena …
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New slip and stress distributions hold implications for the next great earthquake in Cascadia
… brittle failure and aseismic creep, and reduce stress on the deep portion of the subduction interface. Cascadia is recognized for having a uniquely strong correlation of tremor and slow slip known as episodic tremor and slip (ETS) that occurs roughly every 14 - 16 months and propagates along …
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Modeling Compressive Stress Distributions at the Interface between a Pallet Deck and Distribution Packaging
… developing predictive models of the compressive stress distributions using the principle of the beam on an elastic foundation and experimentally quantifying the compressive stress distributions. The overall objective of this study is to develop a model that predicts compressive stress …
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Quantitative Analysis of the Compressive Stress Distributions across Pallet Decks Supporting Packaging in Simulated Warehouse Storage
… was to quantitatively analyze compressive static stress distributions across pallet deck surfaces supporting flexible and rigid packaging in simulated warehouse storage systems. Three different densities of polyolefin foams (2, 4, and 6 lb/ft3, pcf) simulated a variety of flexible and rigid …
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An investigation into the prediction of thermal and stress distributions set up during welding using finite-element analysis
During the welding process, thermal and stress distributions are set up in the workpiece. These thermal stresses are recognized as among the most important factors affecting the weldability of steels, producing distortion and cracking in weldments. This thesis examines the history and theory of the …
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A theoretical one-dimensional analysis of the transient temperature and stress distributions in a long cylinder subjected to conductive cooling and heating
… Analytical solutions for the temperatures and stresses as functions of the time and of the radial coordinate in the cylindrical specimen are presented and the maximum tensile stresses in the specimen are shown to depend on the ratio of thermal conductivities and on the ratio of volumetric heat …
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A theoretical one-dimensional analysis of both the temperature and stress distributions in a flat semitransparent plate subjected to a high intensity radiative source at arbitrary incidence angles
The temperature and thermal stress distributions in a semi-transparent solid of flat plate geometry exposed to a collimated radiative source for various angles of incidence is investigated. This plate is convectively insulated on the surface where the radiation is incident while the rear surface is …
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Analysis of shear test methods for composite laminates
An elastic plane stress finite element analysis of the stress distributions in four flat test specimens for in-plane shear response of composite materials subjected to mechanical or thermal loads is presented. The shear test specimens investigated include: slotted coupon, cross beam, Iosipescu, and …
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On the Theory of Stress-Assisted Diffusion
… steady-state solutions of a recently developed stress-assisted diffusion theory are obtained. General transient solutions are obtained analytically for certain classes of stress distributions. For general stress distributions a perturbation method is employed to produce transient solutions. …
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A study of the mechanical behavior of a 2-D carbon-carbon composite
… an understanding of the factors influencing the stress distribution in such a laminate. The experimental portion of this study consisted of performing an out-of-plane tensile test in a scanning electron microscope and determining the modes of failure. Failure was found to be interlaminar, with …
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A study of fretting fatigue incorporating sharp corner contact geometry.
… of dominant fretting cracks by influencing the stress distributions in the region of the contact.The current research programme presents a method of analysing flat contacts containing sharp comers. The method includes the development of a finite element solution capable of accurately predicting …
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Hybrid Ray Optics and Continuum Mechanics Modeling of Cell Deformation in the Optical Stretcher
… method has been found for measuring the optical stress that produces the observed trapping and stretching of biological cells and other dielectrics. Hence, mathematical and computational models have been developed to calculate the optical stress and net stretching force. The ray optics (RO) model …
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Analysis of tire-pavement interaction and pavement responses using a decoupled modeling approach
… for the accurate analysis of load-induced stresses and strains in the pavement structure. This dissertation focuses on the analysis of the mechanism of tire-pavement interaction and the effect of tire-pavement interaction on pavement responses using a decoupled modeling approach. First, an …
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Characterization Of Evaporative Metal Bonding In Superalloys For Use In Gasified Coal Turbine Generators
… model of the bonding process to determine the stresses present at the bondface at the bonding temperature. A model of the geometry used to create the diffusion specimens was created in ANSYS Workbench 14.0. The stress distributions of the model at the bondface were compared to other research of …
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Shear stresses in turbulent flow through concentric annuli
… approach to the direct measurement of wall shear stresses in fully developed turbulent flow in concentric annuli is presented. By means of a specially constructed 6 m test rig known as the 'floating sleeve', results of individual wall shear stresses, friction factors and shear stress distributions …
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Stresses in egg-shaped sludge digesters in the form of ellipsoidal shells of revolution
… sludge digester geometries. In terms of stress behaviour, these studies found the geometries to be suitable to act as egg-shaped sludge digesters. This thesis extends the list of geometries explored and considers the stress behaviour in an ellipsoid of revolution. First, only the membrane …
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Damage states in laminated composite three-point bend specimens - an experimental/analytical correlation study
… the experimental results with the analytical stress distributions. The analytical solution procedure was based on the stress formulation approach of the mathematical theory of elasticity. The solution procedure is capable of calculating the ply-level stresses and beam displacements for any …
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A Deep Learning Approach to Predict Full-Field Stress Distribution in Composite Materials
… proposes a deep learning approach to predict stress at various stages of mechanical loading in 2-D representations of fiber-reinforced composites. More specifically, the full-field stress distribution at elastic and at an early stage of damage initiation is predicted based on the …
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