Abstract
The axial fatigue life of 300 M steel subjected to a high stress amplitude was investigated for 3 peening conditions. Peening-induced roughness, residual stresses and their relaxation during cyclic loading were quantified. B-basis analysis was employed to compare the peened and unpeened specimens' fatigue lives. It was observed that a competition between the detrimental effect of roughness and the beneficial effect of compressive residual stresses determines the fatigue crack initiation site. A stress-intensity factor-based approach was proposed to predict a lower bound for fatigue lives. These analytical fatigue life predictions agreed with the statistical B-basis values for conditions exhibiting low scatter.
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