き裂伝ぱ経路に及ぼすじょう乱および異方性の影響

概要

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Effect of disturbance due to material inhomogeneity and that of anisotropy on the path of crack propagation in brittle material are analyzed by the body force method. Disturbance is characterized by two factors, i.e. one is the magnitude and the other is the density of disturbance in materials. When a straight crack on x-axis propagates in a plate under biaxial tension (σ_<x∞>, σ_<y∞>), the path of crack propagation is influenced by both the ratio of σ_<x∞> to σ_<y∞> and the disturbance. When σ_<x∞>/σ_<y∞>≧10, the total path of crack propagation is almost entirely determined by the magnitude of disturbance at the start of propagation. When σ_<x∞>/σ_<y∞><cong>5, the intermediate phenomena between σ_<x∞>/σ_<y∞>=2 and 10 occur. Even the weak anisotropy of K_<IC> remarkably influences the path of crack propagation. The experimentally obtained path of fracture of a circumferential surface crack in a pressurized acrylic cylinder can be explained only by considering the anisotropy of K_<IC>.
一般社団法人日本機械学会の論文
1985-03-25