948 resultados para Other Materials Science and Engineering
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Mode of access: Internet.
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"Sponsored by Office of Aerospace Research, Air Force Systems Command, United States Air Force."
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First published in 1891.
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Mode of access: Internet.
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Mode of access: Internet.
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"No. 93."
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Includes bibliographical references.
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Principally tables.
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"Reprinted with additional chapter 1919, 1920."
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Mode of access: Internet.
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Mode of access: Internet.
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"NSF 71-42."
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Thesis (Master's)--University of Washington, 2016-06
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Computational Methods for Coupled Problems in Science and Engineering
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The purpose of this study was to evaluate the incidence of corrosion and fretting in 48 retrieved titanium-6aluminum-4vanadium and/or cobalt-chromium-molybdenum modular total hip prosthesis with respect to alloy material microstructure and design parameters. The results revealed vastly different performance results for the wide array of microstructures examined. Severe corrosion/fretting was seen in 100% of as-cast, 24% of low carbon wrought, 9% of high carbon wrought and 5% of solution heat treated cobalt-chrome. Severe corrosion/fretting was observed in 60% of Ti-6Al-4V components. Design features which allow for fluid entry and stagnation, amplification of contact pressure and/or increased micromotion were also shown to play a role. 75% of prosthesis with high femoral head-trunnion offset exhibited poor performance compared to 15% with a low offset. Large femoral heads (>32mm) did not exhibit poor corrosion or fretting. Implantation time was not sufficient to cause poor performance; 54% of prosthesis with greater than 10 years in-vivo demonstrated none or mild corrosion/fretting.