Abstract
The effect of periodic overloads on enhancement or delay of fatigue crack initiation and propagation at a transverse stiffener detail is investigated. A total of 73 specimens fabricated from A588 steel were tested. The overloading conditions were: (1) No overloads; (2) one overload applied at the beginning; and (3)six cases in which overloads were applied every 10 to the sixth to 10 constant amplitude cycles. The ratio of overload to the loads applied during constant cycling was 1.67. Overloads applied every 10 cubed cycles or farther apart extended life with the longest delay occuring at a spacing of about 10 to the cycles. The transition from delay to enhancement of fatigue cracking occurred at 10 fifth squared cycles. Reasons for delay effects on fatigue crack initiation and propagation are presented. /Author/
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