疲労き裂伝ぱ速度に対する複合変動モデルの検討

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In this paper,the composite variability model as a stochastic model of the fatigue crack propagation rote has been examined, and compared with the intra-specimen variability model examined in the previous papers. The composite variability model assumes that the parameter C in the Paris's law da/dN=(C(ΔK)^m is a random variable of which randomness is composed of the variability within a specimen and that between specimens,whereas the intra-specimen variability model assumes only the former component. First,equations for the mean value, μ_N, and the coefficient of variation,η_N,of the crack propagation life N were derived based on the composite variability model. These equations were found to be in good agreement with our experimental results. With respect to η_N,the composite variability model was in better agreement with the experimental results than the intraspecimen variability model was. The correlation distance estimated by the composite variability model was of the same order as that estimated by the intra-specimen variability model,although the farmer is a little smaller than the latter. It was also shown that the scatters of C_S and m_s observed experimentally when the equation da/dN=C_s(ΔK)^m_s is applied to each specimen could be explained by the composite variability model as well as by the intra-specimen variability model. As a whole,the composite variability model was found to be in a slightly better agreement with our experiment than the intra-specimen variability model was,but more experimental examinations are necessary before reaching a definite conclusion.
社団法人日本材料学会の論文
1986-11-15

疲労き裂伝ぱ速度に対する複合変動モデルの検討

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