ランダム荷重による疲労亀裂伝播 : 第2報実験とシミュレーションとによる予測

概要

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An efficient method to generate narrow band stationary Gaussian random load sequences for fatigue test is proposed. Fatigue crack propagation tests under stationary Gaussian random stress intensity factor process were carried out with 3 different power spectral densities to see the effect of load profile on the growth rate. The reciprocals of the experimentally obtained growth rate were plotted on the Weibull probability paper to find that slight change in the band-width has little effect on the probability distribution of the resistance to the fatigue crack propagation. Simulations of crack growth using the data obtained by the previous tests showed a good agreement with the experiments. It is confirmed that the probability distribution of fatigue crack propagation life can be estimated by simulations provided that statistical data are supplied by the test method previously proposed by the authors.(ref. 7)
社団法人日本船舶海洋工学会の論文