疲労き裂伝ぱ速度に対する試験片内変動モデルの検討

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In this paper,examinations have been made on the intra-specimen variability model as a stochastic model of the fatigue crack propagation rate. This model assumes that the parameter C in the Paris' law da/dN=C(ΔK)^m is a spatial random variable within a specimen. The examinations were made with respect to the following two points. The first examination was concerned with the relation between the experimentally observed inter-specimen variability of the parameters in the Paris' law and this model. When the equation da/dN=C(ΔK)^m_s is applied to each specimen,inter-specimen variability of C_s and m_s is observed experimentally. It is known that log C_s and m_s are normally distributed approximately and three exists a strong correlation between log C_s and m_s. This paper first examined if these experimental characteristics can be interpreted by the model. From the analysis, it was shown that the above mentioned experimental characteristic could be interpreted by the intra-specimen variability model both qualitatively and quantitatively. The second examination was concerned with the correlation distance which appears in this mode. It was attempted to estimate the value of the correlation distance,and a rather large value was obtained. Thus,it was pointed out that a detailed consideration is necessary on the relation between the correlation distance and the microstructure of the material. Finally, a possibility of a modified model was suggested in which the parameter C was assumed to be a random variable among specimens as well as within a specimen.
社団法人日本材料学会の論文
1986-10-15

疲労き裂伝ぱ速度に対する試験片内変動モデルの検討

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