クロスプライ積層板における面外負荷に伴う層間はく離形成過程の数値解析

概要

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Interlaminar crack extension in continuous fiber-reinforced laminates due to accidental transverse loading is one of the most serious problems in actual service applications of this kind of composite. Here we attempt to numerically obtain the relation between the in-plane two-dimensional extent of interlaminar cracks and the transverse load applied to the laminate by quasi-static indentation. Our attention is focused on the local energy release rate along the interlaminar crack front. The two-dimensional multi-layered finite-element method is developed, which employs two-dimensional bending elements of each lamina stacked to represent the laminate. This FEM enables us to easily estimate the energy release rate at any point on the interlaminar crack front. Under the condition of a constant critical energy release rate, we carry out the computational simulation of interlaminar crack extension for the case of a three-layered cross-ply laminate. Simulated extension behavior of interlaminar cracks under increasing indentation load appears to be in good agreement with the experimental observations.
一般社団法人日本機械学会の論文
1996-01-25