A Theoretical Study on the Fatigue Life Distribution of Metallic Materials near the Fatigue Limit

概要

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In order to derive theoretically the fatigue life distributions of metals and alloys, it is assumed that a propagative fatigue crack is initiated at the region on specimen surface where the slips occur in two or more mutually adjoined grains, and that the orientation of a grains distributed uniformly in every directions. Then, the linear models for the configuration of grains in the surface layer are combined with these assumptions for the simplicity of formulation. Theoretical results obtained here are in good agreement with the trends of the experimental results on the distribution of fatigue lives in low stress levels near the fatigue limit. Especially, the trend of the probability of failure being saturated at a finite level and the stress dependency of this trend are well explained by the theory established in this study.
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