鋼の低サイクルランダム疲労に関する研究(第2報) : 荷重系列の影響についての考察

概要

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Assuming a fatigue crack propagation mechanism, the effect of characteristics or randomized load sequences on fatigue life was discussed using numerical simulation with the aid of the electronic digital computer. Fatigue lives under independent random load sequences were longer and showed smaller coefficient of variation than those under correlated random load sequences. The effect of truncation of the probability density function was remarkable, the larger the minimum load, the longer the fatigue life. The number of possible load levels, when load level is assumed discrete, should be large enough to obtain a good estimate of life. To simplify testing method a selected load may be applied several times and changed to another one. Such simplification, however, may give shorter life than the actual.
社団法人日本船舶海洋工学会の論文