レイルシヤテスト法によるガラスクロス/エポキシ積層板のモードII破壊じん性評価

概要

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Rail-shear tests were carried out on the glass cloth/epoxy laminates, and then the mode II fracture toughness value K_<IIin> was obtained as the pre-crack length, 2a/ W, was altered from 0.2 to 0.45. In addition, the spread of damage was obtained under simulation by the finite element method and then compared with the experimental results. The following results were obtained; (1) In this test method, the recommendable pre-crack length existed in order to obtain the fracture toughness value. (2) The material used in this study was assumed to be a homogeneous an isotropic material of a tetragonal system, and then the finite width correction factor of the specimen geometry was calculated. Consequently, K_<IIin> became almost constant in the range of 2a/ W=0.25〜0.45. (3) The spread of damage was simulated by the finite element method, and it was found that the analytical result agreed with the initial failure process obtained in the experiment. In addition, the J_<II> value was calculated from the path integral, and discussed.
社団法人日本材料学会の論文
1988-06-15