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 32 for “"dynamic stress"”.
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An Application of Scattered Light Photoelasticity to Dynamic Stress Analysis
Made available in DSpace on 2014-12-10T17:25:39Z (GMT). No. of bitstreams: 1 6711863.pdf: 1782661 bytes, checksum: 45f956d1b7b99f7ccf6cd80f8647b2da (MD5) Previous issue date: 1967
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Static and Dynamic Stress/Strain Properties for Human and Porcine Eyes
… trauma, however, existing models lack accurate stress and strain properties for ocular globe rupture. A pressure system was built to examine static and dynamic globe rupture pressures for healthy postmortem human and porcine (pig) eyes. Maximum rupture stress for the quasi-static tests was found …
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A Dynamic Stress Investigation of Intersecting Cylinders by the Finite Element Method
… three-dimensional finite element method, the stress concentration present around the intersection of unreinforced two normally intersecting cylinders and two 45 deg. lateral connections is evaluated. Complicated structural behavior in the vicinity of the region with its sharp variation of …
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Computation of Dynamic Stress Intensity Factors by the Time Domain Boundary Integral Equation Method (Crack, Propagating)
… (BIEM) to the solution of a number of elastodynamic crack problems is presented. In addition to the usual element having constant space and time interpolation of tractions and displacements on the boundary, a new boundary element which incorporates quadratic variation in space and linear …
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Dynamic Characterization of Wide Bandgap Devices for Power Electronic System Integration
… power electronic systems. However, the dynamic stresses induced by application-specific conditions present limited physical and behavioral understanding, posing critical concerns for reliability and performance degradation. Therefore, this dissertation presents novel characterization …
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Extra-light log trailer design
… necessitated the experimental measurement of dynamic loads exerted on a log trailer and a comprehensive stress analysis of the structure. Two light-weight, prototype, log trailers were selected to be studied, after an exhaustive survey of the existing designs. Finite element models (FEM) were …
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A Spacetime Discontinuous Galerkin Finite-Element Method for Elastodynamic Analysis
… element model to investigate a series of elastodynamic problems in both one and two spatial dimensions. The first study focuses on the problems that exhibit discontinuities or shocks. The new method delivers high accurate results. The second study investigates the convergence properties of the …
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The Coefficient of Earth Pressure at Rest and Deformation and Densification of Granular Soils Subjected to Static and Dynamic Loading
… mainly the series of oedometer test with lateral stress measurement, were conducted on Ottawa, Lake Michigan Beach, Niigata, and Toyoura sand. Reconstituted dry sand specimens were subjected to 7 different loading histories, and the maximum effective vertical stress was 341 kPa. Different …
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The strain rate dependent mechanical properties and modelling of bovine cortical bone in compression
… maximum value at the rise time. The variation in dynamic strain rate was rectified by shaping the Hopkinson bar input pulse with a reusable, conical striker bar. The hypothesis investigated was that a varying strain rate history could result in the measurement of a smeared response for materials …
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Minimization of stresses and pressure surges in pipes using nonlinear optimization.
The control of stresses and liquid pressure surges in pipes is an important problem in the design of hydraulic pipe networks. The method of characteristics has been used to solve the transient stresses and pressures in liquid-filled piping systems. The friction force is included in the equations of …
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Accent and Grouping Structures in the String Quartets of Béla Bartók
… from patterns of accent produced by pitch onset, dynamic stress, articulation or any other accentual factors. Timepoint Grouping Structures (TGS) delineate the number of timepoints present in alternating groups/blocks in a texture, thereby allowing for the recognition of patterning created by …
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Dynamic Analysis of Interfacial Cracks in Composite Laminates
… widely used today. In this paper, the order of dynamic stress singularity of interfacial cracks is derived, and a hybrid finite element method is successfully developed for this problem. Both the cases of open and closed cracks are considered. An integral transform, the Wiener-Hopf technique, …
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Collision Analysis of the Reversible Crankshaft Mechanism in a Convertible Refrigeration Compressor
… is the problem, an understanding of the stress state during the collision is needed. This thesis begins the work necessary to determine the dynamic stress state present within the system. A FORTRAN program was developed that modeled the kinematic behavior of the system under operating …
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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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Relationships Between Training Load Metrics and Injury in Collegiate Women's Soccer
… sprints, accelerations, decelerations, and dynamic stress load (DSL). These variables were analyzed using statistical process control charts (SPC Charts) and Nelson Rules. Overall, there were 1,235 violations for the team, with the highest amount coming from DSL. Throughout the season, there …
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High power li-Ion battery performance: a mechanistic analysis of aging
… schemes (i.e. standard, fast charging and dynamic stress) cause on commercial high power LiFePO 4 batteries is reported in this work. In addition, an efficient, multistage fast charging protocol is developed and analyzed. In order to identify both qualitatively and quantitatively the aging …
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Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… the calculations using a computational fluid dynamics code, Fluent, but these ultimately were unsuccessful. Additional studies were conducted on the static stress imparted on the vessel, and the dynamic stress caused by a seismic event. The static stress was found to be within ASME code …
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Characterisation and Modelling for Elastomeric and Gel-Like Magnetorheological Materials
… In a pioneering manner, the field-dependent dynamic stress-strain hysteresis of MR gel is characterised and shows a unique stress overshoot phenomenon. A simple hysteresis model with support vector machine generalisation technique is formulated and validated the experimental results. Finally, …
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Long-Term Associations Between Subjective Ratings of Wellness and Exertion and Parameters of Training Load in Elite Soccer Over Two Seasons
… covered (TD), high-speed running (HSR) and dynamic stress load (DSL), were significantly associated with subjective measures post-training. However, correlations between pre-training MS and HSR were discovered for the squad during the 2014/15 season. These observations were positive which …
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