CFRPの面内破壊じん性 : 第2報,解析的検討

概要

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The sub-microscopic fracture processes of carbon/epoxy [0/90] laminates are analysed experimentally and numerically. The single edge notch (SEN) specimens are loaded to several levels of K_I, and the 3-dimensional crack growth behavior is investigated by using X-ray radiography. The 3-dimensional stress distribution in [0/90] laminates is calculated by the finite element method (FEM), and crack front singularities are measured by using the 3-dimensional j-integral. Before the applied load reaches K_C, it is observed that sub-cracks propagate parallel to fiber direction in each ply, but the finite element analysis of crack propagation represents the fact that the effects of the sub-crack growth on the stress of fiber direction ahead of the initial crack tip is not remarkable. K_<cf> and K_<cm>, which represent the fracture toughness values of fiber breaking and matrix cracking respectively, are obtained by the 3-dimensional FEM, and it is concluded that the fracture toughness K_C of [0/90] laminates can be evaluated well from K_<cf> and K_<cm>.
社団法人日本機械学会の論文
1985-11-25