Abstract
The present paper investigates statistical variation in the growth rates (da/dN) of multiple small surface cracks in a JIS S 45 C steel subjected to rotating bending fatigue in air. The growth rates of the cracks were found to follow a power law : da/dN = C(σa√((πa))m where a is the half surface length of each crack and σa the applied stress amplitude. C and m in the law varied among the multiple cracks, and obeyed the normal and the log-normal distribution, respectively ; nevertheless, they were related to each other by C = A/Bm where A and B are some constants. The 95% confidence limits of the variation in da/dN of the multiple small surface cracks were calculated by using these statistical data.
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