一方向連続繊維強化複合材の繊維破断部付近の界画せん断応力緩和モデルおよびクリープ破断解析

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This paper describes a relaxation model of interfacial shear stress aoting on broken fibers in unidirectional metal matrix composites reinforced with long brittle fibers. A cylindrical cell with a broken fiber embedded in power law creeping matrix is considered, and the broken fiber is assumed to have a bilinear distribution of axial stress. Then, on the basis of energy balance in the cell, a relaxation equation of interracial shear stress is derived in a simple form. Under overall constant strain the relaxation equation is integrated to give an analytical solution, which is shown to agree fairly well with the numerical analysis of Du and McMeeking. Moreover, the relaxation equation is combined with Curtin's model, so that rupture time in long term creep is evaluated analytically on the assumption of global load sharimg. It is shown that the resulting relation represents well the dependence of creep rupture time on applied stress observed experimentally on SCS-6/Beta21S at 500℃.
社団法人日本材料学会の論文
1998-02-15