Abstract
The iufluence of complex stress histories on the fatigue life of members was investigated to determine the relationship between fatigue life and the relative number and amplitude of imposed cycles of stress. A physical model of fatigue damage was formulated in terms of the number of damage nuclei initiated by the highest applied stress and the propagation of damage by all subsequent cycles of stress. Based on this physical model, a mathematical equation was derived that related the fatigue life to stress history. Further interpretation of this equation was made by an alternative hypothesis. Aluminum alloy, hard- drawn steel, and high-strength steel music wires were tested and the data statistically analyzed to obtain a measure of mean fatigue life and scatter. (auth)
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