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 30 for “"stress components"”.
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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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Boundary methods for the determination of stress components in solid circular plates
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Civil Engineering, 1949
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Thermo-mechanical stress measurement and analysis in three dimensional interconnect structures
… CTE mismatch between Silicon and Copper, thermal stresses are induced by various thermal histories from the device processing, and they have caused serious concerns regarding the thermal-mechanical reliability. Firstly, a semi-analytic approach is introduced to understand stress distributions in …
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A penalty finite element model for axisymmetric flows of power-law and white-metzner fluids
… on a mixed formulation involving velocities and stress components. For the White-Metzner model, only the mixed model involving the velocities and extra stress components can be developed. The pressure variable does not enter the finite element model because of the application of the penalty …
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Theoretical study of thermal spalling of brittle materials
… The individual contribution of several stress components and their combined effects on the risk of failure are then considered for a theoretical axi-symmetric body subjected to uniform unconfined heating. The results indicate that using a single stress component in the prediction of …
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Strength of transversely isotropic rocks
… transversely isotropic rocks under true triaxial stress states. One major obstacle in formulating an anisotropic criterion is that it usually involves six stress components, instead of three principal stresses. As such, anisotropic criteria usually lead to complicated mathematical expressions, and …
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Application of infrared birefringence imaging for measuring residual stress in multicrystalline, quasi-mono, dendritic web, and string ribbon silicon for solar cells
… wafers due to its role in generating residual stresses that can lead to fracture upon wafer processing and handling. This thesis explores the nature, impact, and a method for quantifying residual stresses in silicon wafers used for solar cells. The combination of an infrared birefringence …
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Interaction of acoustic waves and anisotropic multilayered composite plates immersed in water.
… wave modes. Computation of the displacement and stress components inside the plate show that different Lamb wave modes excite different levels of energy at various depths of the plate. These modes can be effectively used to detect and image defects in different layers of a plate. Theoretical …
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Interactive Buckling and Post-Buckling Studies of Thin-Walled Structural Members with Generalized Beam Theory
… the shear lag effect and nonlinear normal stress distribution in the vicinity of a hole, GBT shear modes with nonlinear warping are included. Modifications are made to the GBT geometric stiffness because of the influence from shear lag effect caused by holes. In the following sections, the …
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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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Random Vibration Analysis of Higher-Order Nonlinear Beams and Composite Plates with Applications of ARMA Models
… is paid to calculate the R.M.S. values of stress components since they directly affect the fatigue life of the structure. A statistical data reconstruction technique named ARMA modeling and its applications in random vibration data analysis are discussed. The model is applied to the …
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High resolution interferometric measurements of residual strains in composites
… accepted as structural materials, residual stresses in them have become a more serious issue. Various experimental methods have been developed and used to measure residual strains in different kinds and shapes of materials. The anisotropic and heterogeneous nature of composites and the …
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Figure correction of thin plate and shell substrates using stress generated by ion implantation
… on a 100 mm diameter substrate, by applying stress to their surface. Ion implantation is one of many possible approaches to applying a controlled stress field to the surface of a substrate. I develop analytical and numerical approaches to calculating stress fields that generate a desired …
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Local and Global Sensitivity Analysis of Thin Ply Laminated Carbon Composites
… very thin plies. Interlaminar shear and normal stress components have been shown to be concentrated on the edges, the so-called edge effect, of unidirectional laminates at the interface between plies of different fiber orientation. Research has shown that decreasing ply thickness can reduce …
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Digital Stress and Well-being Among Peruvian Adolescents During the COVID-19 Pandemic
… Previous studies have found that digital stress moderates the impact that social media and digital devices have on psychosocial outcomes, such as depression, anxiety, and loneliness, among young adults and a small sample of adolescents (Hall et al., 2021). In this study, we extend these …
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A Mesh Objective Algorithm for Modeling Mode-I Cracks Using a Standard Finite Element Formulation
… (i) accumulation of spurious shear resulting in stress locking, (ii) misalignment of the stress field around the cracked element, and (iii) incorrect prediction of the crack propagation direction. Four new and distinct techniques are developed to preclude both spurious shear accumulation and …
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Dynamic Response of Linear/Nonlinear Laminated Structures Containing Piezoelectric Laminas
… the deflections of the plate. The maximum shear stress at the interface between the sensor and the lamina is found to be lower than that between the actuator and the lamina. The point of maximum output voltage from the sensor coincides with that of its peak out-of-plane displacement. The …
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High Resolution Simulation of Laminar and Transitional Flows in a Mixing Vessel
… and turbulent quantities such as the Reynolds stress components, dissipation length η and time scales Ï , as well a detailed investigation of the near-impeller flow and trailing vortex. Calculation and compilation of all terms in the turbulent kinetic energy transport equation was performed …
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A comprehensive study of the 26th December 2004 Sumatra earthquake: possible implications on Earth rotation and investigations on the coseismic and postseismic stress diffusion associated with the seismic rupture
… of the earthquake on the Earth rotation and the stress field variations associated with the seismic event. In the first part of the work we have quantified the effects of a water mass redistribution associated with the propagation of a tsunami wave on the Earth’s pole path and on the …
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The Role of Turbulence on the Initiation of Sediment Motion
… employed to measure the instantaneous velocity components at different points near the vicinity of a ball while the ball motion is monitored with a video camera. An image analysis program is developed here to analyze the motion of the particles within a test area. To examine the importance of …
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