織物GF/EP積層板の混合モード層間はく離進展に及ぼす織構造の影響

概要

論文の詳細を見る
Woven GFRP laminates composed of epoxy resin were used as specimens to investigate the effect of textile structure on growth of interlaminar delamination under repeated mixed-mode loading. Different shapes of specimens were prepared with mode ratios (G_I/G_<II>)=3.76, 1.33 and 0.500, and the reinforced fibers were of two different textures ; one was standard texture (ST), the other was loose-weft texture (LT). Results of static ELS test and fatigue ELS test showed that in the ST case, the fracture toughness of the specimen with G_I/G_<II>=0.500 was the lowest and the crack growth rate of the specimen with G_I/G_<II>=0.500 was the highest. In the LT case, however, the fracture toughness of the specimen with G_I/G_<II>=1.33 was the lowest and the crack growth rate of the specimen with G_I/G_<II>=1.33 was the highest. Results of microscopic observation showed that the fracture pattern of the specimen with G_I/G_<II>=1.33. was mixture of those of samples with G_I/G_<II>=3.76 and 0.500. In modeling of fracture by maximum stress theory, the deformation and failure of specimens with G_I/G_<II>=3.76 and 0.500 were simulated by FEM. The analytical results showed good agreement with the experimental results.
一般社団法人日本機械学会の論文
1995-01-25