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 5 of 5 for “"fatigue lifetimes"”.
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Interacting stress concentration factors and their effect on fatigue of metallic aerostructures
… not well understood and the resulting impact on fatigue performance is difficult to predict. There exists a need for fatigue data that can be used to determine the analysis methods for evaluation of the interaction of machined steps and fastener holes. In this dissertation, the effect of stress …
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Eddy current detection of fatigue cracks in drill pipes
… corrosion have tended to cause circumferential fatigue cracks to develop on the outside surface of the drill pipe and propagate inwards. As no early warning system exists, these cracks propagate undetected until failure occurs. High operational costs and losses associated with down time, provide …
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Deformation at Low Temperatures in Single Crystal Ni-base Superalloys
… Ni-base superalloys have implications for fatigue and thermomechanical fatigue lifetimes. Changes in composition across superalloy generations have prioritised high-temperature properties. This led to a reduction in yield strength at low temperatures, particularly in the 4th-generation …
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The Effect of Catalyst Layer Cracks on the Mechanical Fatigue of Membrane Electrode Assemblies
Mechanical fatigue testing has shown that MEAs (membrane electrode assemblies) fail at lower stresses than PEMs (proton exchange membranes) at comparable times under load. The failure of MEAs at lower stresses is influenced by the presence of mud cracks in the catalyst layers acting as stress …
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Analytical and computational methods for non-Gaussian reliability analysis of nonlinear systems operating in stochastic environments
… long term plans such as maintenance schedules, fatigue calculations, and route selections. These statistics are especially important during the design phase, when the statistical performance of different hull configurations or structure designs is an important factor in choosing the final …