P分布荷重による累積疲労被害: 第二報 : 低・高サイクル寿命域疲労に対する改良モデル

概要

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In view of non-conservative prediction of cumulative fatigue life calculated by Miner's and Haibach's methods, the authors proposed in a previous paper a new model providing better and conservative prediction, although it was limited in application to only the bi-linear fatigue diagram in high cycle fatigue regime. If a fatigue diagram will be required to be expressed for a wide range of fatigue life from very low cycle to high cycle regimes, it is a convenient way to express the diagram by Stromeyer's expression. The previously proposed model is developed in the present paper so as to be applicable to Stromeyer's as well as bi-linear expressions of a basic fatigue diagram in undamaged condition. The newly proposed model in this paper is based on a concept consisting of two assumptions ; (i) Fatigue damage will be accumulated as a power function of cycle ratio, and (ii) Fatigue strength at infinite fatigue life or at 10^7 cycles will decrease functionally according as accumulation of fatigue damage.
社団法人日本船舶海洋工学会の論文