Abstract
Static and cyclic fatigue tests were performed on alumina using smooth-surface flexure specimens under several constant stress levels. The fatigue lifetimes, including imperfect data, were analyzed statistically to estimate the original distributions of the lifetimes. A technique for estimating the static and cyclic fatigue limits was proposed using the residual strength of the specimens surviving after the running time. The effects of cyclic stress on fatigue crack extension were confirmed experimentally by comparing the stress-lifetime curves obtained in the static and cyclic fatigue tests on smooth-surface specimens.
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