p分布ブロック荷重による累積疲労被害の一検討

概要

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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.
社団法人日本船舶海洋工学会の論文
1978-12-00