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 28 for “"static stress"”.
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Rock fracture under static stress conditions
… of rock fracture, particularly under compressive stress conditions, is of fundamental importance. This thesis contains details of an investigation into the applicability of Griffith's brittle fracture theory, modified to account for the effects of crack closure in compression, to the prediction of …
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Static stress distribution in tall cylindrical bins filled with pseudosolid grains
… the intensities of the horizontal and vertical stresses in the grain mass and on the walls of storage bins has continued for some time. This ratio is commonly referred to as the K ratio. Four different experimental methods were used to determine K in a model cylindrical bin. At rest, …
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Improving statistical seismicity models
… of the earthquake triggering process, including static stress interactions and dynamic stress transfer. Significant differences of these mechanisms are particularly expected in the spatial distribution of aftershocks. However, testing the different hypotheses is challenging because it requires …
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Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… 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 limits. Seismic analysis determined that a seismic isolation scheme would be necessary in order to prevent …
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Análise de tensões primárias e secundárias em sistemas de tubulação
It is presented a static stress analysis for a piping system and it is emphasized how it is important the distinction between primary and secordary stresses.Particular emphasis is done on secondary stress analysis and on ANSI B 31.3 (American National Standard Code for Pressure Piping) criteria for …
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Modelling of the inertia welding of Inconel 718
… cause for the existence of a band of high hydrostatic stress near the weld line. The holding effect of this high static stress is the reason for the presence of the very soft material at the welding interface. The models were used to predict the displacement of the weld line (upset) with a …
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Source Parameters and Tectonic Setting of the 2017 St. Elias Earthquake Sequence near the Southern Terminus of the Eastern Denali Fault, Northwestern Canada
… along two previously unmapped fault structures. Stress inversion indicates that the maximum principal stress axis is oriented almost perpendicular to the EDF, suggesting that the fault system is not well oriented for strike-slip in the contemporary stress field. Coulomb stress analysis indicates …
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A three constituent mixture theory model of cutaneous and subcutaneous tissue in the context of neonatal pressure ulcer etiology and prevention
… calibrated and validated and used to investigate stress and fluid velocity under quasi-static and time-varying loading conditions, respectively. Four input strain profiles were considered, including uniform, geometric circular segment, Gaussian, and Hertz-type strain profiles. Calibrated bulk and …
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Gas permeability changes in rock salt during deformation.
… and porosity measurements coincident with hydrostatic and triaxial quasi-static, stress-rate controlled compression tests. The permeability and porosity of the as-received samples decrease significantly as a result of hydrostatic loading. These changes are largely irreversible, and are believed …
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The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… the available earthquake rupture area. Coulomb stress models suggest that long ITSCs will prohibit static stress interaction between segments of a transform system and further limit the maximum possible magnitude of a given transform fault earthquake. In Chapter 2, gravity anomalies from a …
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High strain rate properties of structural aluminium.
… have been used in the past to determine the stress-strain relationship of metals and alloys at high strain rates of up to 2.2 x 10 per second; some of these were approximate whilst others required expensive equipment. In the present study three aluminium alloys, HE15, HE30TF and DTD5044 have …
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The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… the available earthquake rupture area. Coulomb stress models suggest that long ITSCs will prohibit static stress interaction between segments of a transform system and further limit the maximum possible magnitude of a given transform fault earthquake. In Chapter 2, gravity anomalies from a …
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Analysis and modeling of transient earthquake patterns and their dependence on local stress regimes
… based on results of a clock advanced model and static stress triggering. To analyze spatial variations of triggering parameters I focus in my second approach on the aftershock occurrence triggered by large mainshocks and the study of the aftershock parameter distribution and their spatial …
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A model treating tensile deformation of semi-crystalline polymers
… the stretching device, we always measured true stress-true strain dependencies for constant strain rates. From the true stress-true strain curves, it is obvious that after a short range a strain softening occurs, followed by a hardening at large deformations. The true stress-strain dependencies …
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Structural and Vibration Analysis of Polymeric Functionally Graded Plates
… of FG plates. Analytical solution for static stress analysis of thin and thick FG plates with variation of stiffness through the length of the plate carries out. Then the numerical simulation achieves using graded elements which implements by user material subroutines (UMAT and USDFLD). …
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Structural shape optimization of three dimensional finite element models
… the program is to achieve a near uniform model stress state and thereby to minimize material volume. The algorithm is iterative, and performs two analyses per iteration. The first analysis is a static stress analysis of the model for one or more load cases. Based on results from the static …
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Extra-light log trailer design
… 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 developed for each of the trailers using three-dimensional …
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Nanoporous glass-ceramics transparent in infrared range to be used as optical sensor-Mechanical and viscoelastic properties of the TAS (Te-As-Se) glass
… TAS fibers tensile strength. When ageing under static stress, they exhibit an increase of tensile strength. The structural relaxation phenomenon is hypothesized to explain these results. The coordination number, , which is a rough measure of the network rigidity, has an influence on the TAS …
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The role of roughness in earthquake source physics
… geometric asperities and a locally heterogeneous stress field, which affect the nucleation and propagation of shear rupture. I study this effect numerically at the scale of small earthquakes, in which realistic geometry and friction law parameters can be incorporated in the model. The numerical …
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