Chain-of-Bundles確率モデルへのマルコフ過程の適用と寿命分布解析(<特集>複合材料)

概要

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Markov process was applied to the chain-of-bundles probability model which is often used for the axial strength analysis of a unidirectional fibrous composite. It was assumed to the process that a group consisting of fiber breakage points, the so-called cluster, evolves in time intermittently subject to two kinds of local load shares around a cluster, and that the composite fractures if the cluster achieves a critical size. Then, the two kinds of cluster evolution processes are governed by simultaneous first-order differential equations. A time-dependent Weibull distribution was used as a lifetime distribution function of the fiber, and the cumulative probability solutions for rupture-time of the critical cluster were analytically obtained. The results showed that the larger clusters reduce the width of distribution and form a master-like distribution curve, similarly to the results predicted from a conventional numerical method, the so-called recursion analysis technique. The proposed Markov process analyses were in a relatively good agreement with the distribution curves predicted by the conventional one. In addition, the effect of ineffective length which is gradually increased in time due to the shear stress relaxation of the matrix in metal matrix composites, was taken into the analysis.
社団法人日本材料学会の論文
1998-05-15