修正マイナー則を用いた疲労強度評価の検討

概要

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In case of evaluating fatigue strength the fatigue damage based on modified Miner's rule is often used. This fatigue damage is simply calculated if the distribution of stress response is assumed to obey some known distribution. In this study, first the contribution ratio of expected repeat number at each stress value to fatigue damage based on modified Miner's rule is numerically calculated. It is found region of small stress value is relatively effective to fatigue damage from the result. Next the authors introduce the correlation coefficient between wave-induce load to calculate fatigue damage. It is revealed fatigue damage can be superposed by use of correlation coefficient. Finally reliability analysis based on the AFOSM method is executed to evaluate the effect of each parameter included in fatigue damage. Through these calculations the usefulness of evaluating fatigue strength based on modified Miner's rule is confirmed.
社団法人日本船舶海洋工学会の論文
2002-03-25