FATIGUE CRACK GROWTH IN LUGS AND THE STRESS INTENSITY FACTOR

摘要

Crack growth in aluminium alloy lugs was recorded during constant-similitude loading (R- l/J). Observations ware Bade both for artificial cracks stared by a small saw cut and natural cracks attracted by fretting corrosion between hole and pin. Scatter was low for artificial crack, whereas considerable scatter applied to the natural cracks as a result of multiple crack initiation a: different times and locations. The fastest crack growth was observed for artificial crocks, which appear to be a worst case as coopered to natural cracks. K-values derived from crack growth results were in good agreement with K-values proposed in the literature.