Interdependence of Equivalent Steady Stress, Crack Growth and Failure on Sequence and Amplitude of Irregular Loading.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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This paper shows how to predict the minimum or other life of material limited by cyclic crack growth and crack failures as a function of the different sequences of amplitudes of loading that may occur under random, quasi-random, or controllable loading conditions. It is assumed that the incremental growth, as well as the criterion of failure, is independent of the history of loading and environment. The method covers the most commonly used law of crack growth and of crack failure. It is obviously applicable to other cyclically induced cumulative phenomena, e.g., degradation as in erosion or thermal fatigue. Author