一方向連続繊維強化複合材料の剛性低下に関するマイクロメカニックス解析

概要

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In a previous study, micromechanical analysis was performed on a unidirectional fiber-reinforced composite showing interfacial debonding between a fiber and the matrix. The criteria for both the matrix crack and the debonding crack propagation were derived, and it was found from the numerical calculations that the unstable propagation of a matrix crack was arrested at some critical size of the crack and then an interfacial debonding occurred. In the present study, based on the previous result, the overall non-linear stress-strain behavior, i.e., stiffness reduction, of a composite whose constituents are all brittle materials is analyzed, assuming such a complicated fracture path that the previously starting interfacial debonding mentioned above ceases to propagate under certain conditions and then propagation and suspension of a matrix Crack recur, and the influence of material parameters such as the volume fraction of a fiber and the surface energy of the interface on the stiffness reduction of a composite is also investigated.
社団法人日本機械学会の論文
1995-08-25