p分布荷重による累積疲労被害(第1報) : 亀裂発生寿命基準によるSM50B鋼の特性

概要

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The results of programmed fatigue tests on 50kgf/mm^2 class high tensile strength steel (SM50B) are dealt with. The programmed block fatigue test was carried out under in-plane bending condition with stress ratio of minus one, changing p-value as an experimental parameter. The fatigue life was defined on the criterion of visible crack initiation life. Main results obtained are as follows; (1) Miner's hypothesis may be valid, if p is equal to O.75, while no fairly accurate estimates were obtained through Miner. Haibach and modified Miner's method in the range of p<__=O.5. (2) A new model for better prediction of an expected crack initiation life was proposed by taking the decrease of the fatigue limit as the functional change of damage factor, and by evaluating the power of cycle ratio as the fatigue damage. This model is found to fit well the experimental results of materials SM50B and SM41 A 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