Abstract
An investigation was made of cumulative fatigue damage of notched mild steel specimens which were subjected to programmed block fatigue loading in in-plane bending condition with stress ratio of minus one. The value of p was changed in the range of zero to one : 0, 0. 25, 0. 5, 0. 75 and 1. 0, and the fatigue life was defined on the criterion of crack initiation life.The following conclusions were obtained :(1) Miner's hypothesis may be valid for p over 0. 75, and Haibach's method for the case 0. 75>p>0. 5. While the modified Miner method may be available for the prediction of an expected crack life in case of p less than 0. 5.(2) A new model for prediction of an expected crack initiation life was proposed by taking the functional change of damage factor, or decrease of the fatigue limit, as a function of p-value into consideration. The model is found to fit well the experimental results for any p-value in the range of zero to one.
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