Some aspects of fatigue relative to cyclic yield stress

Abstract

This paper deals with cyclic fatigue behaviour in the regime between the classical LCF and the high cycle endurance limit. Plastic stress has been identified as a component of the stress range by investigating the relationship between the stress and plastic strain ranges. When the cyclic yield stress is incorporated into this relationship, it is found that: the plastic stress and plastic strain ranges can be correlated by the power rule, and; the cyclic yield stress is identical to the endurance limit. This paper proposes two methods for evaluating the cyclic yield stress from experimental data. Because of its relationship with the cyclic yield stress, the endurance limit can be well defined for practical applications.