Crack growth in aluminium alloy lugs was recorded during constant‐amplitude loading ( R = 1/3). Observations were made both for artificial cracks started by a small saw cut and natural cracks started by fretting corrosion between hole and pin. Scatter was low for artificial cracks, whereas considerable scatter applied to the natural cracks as a result of multiple crack initiation at different times and locations. The fastest crack growth was observed for artificial cracks, which appear to be a worst case as compared to natural cracks. K ‐values derived from crack growth results were in good agreement with K ‐values proposed in the literature.
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Schijve et al. (1979) studied this question.
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