Abstract

Abstract In this paper, so-called fatigue failure maps are studied as a function of initial flaw size distributions. The main cause of fatigue failure for brittle materials, and of fatigue initiation for ductile materials, is that initial flaws become critical. Fatigue failure maps where the number of cycles to initiation for a given failure probability is plotted for various flaw size distributions are a means of characterizing the influence of the initial flaw distribution on fatigue crack initiation. The results are applied to fatigue failure of austempered spheroidal graphite cast iron.

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