Abstract
A new methodology to calculate the equivalent initial flaw size (EIFS) distribution is proposed in this paper. The proposed methodology is based on the Kitagawa-Takahashi diagram and only uses fatigue limit and fatigue crack threshold stress intensity factor under constant amplitude load. Unlike the commonly used back-extrapolation method for EIFS calculation, the proposed methodology is independent of applied load level by definition and is very efficient in calculating the statistics of EIFS. The developed EIFS methodology is combined with a probabilistic crack growth analysis to predict the fatigue life of a smooth specimen. Model predictions are compared with experimental observations for various metallic materials.
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