Application of the Hypothesis of Non-Propagating Fatigue Crack to the Push-Pull Fatigue Testing of an Infinite Plate with an Elliptical Hole Notch

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In this report the hypothesis of non-propagating fatigue crack proporsed in a previous report was applied to the case of an infinite plate with an elliptical hole notch which was subjected to push-pull fatigue stress at zero mean stress. Following results were obtained by the calculation. The non-propagating fatigue crack curve obtained by the application of the hypothesis well explained not only the relation between non-propagating crack length and given alternating stress but also the crack propagation fatigue limit. Further, it was shown by the hypothesis that there was the critical crack size as the constant by which the crack initiation fatigue limit in the low stress concentration factor region could be decided.
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