Abstract
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 (σx∞, σy∞), the path of crack propagation is influenced by both the ratio of σx∞ to σy∞ and the disturbance. When σx∞/σy∞≥10, the total path of crack propagation is almost entirely determined by the magnitude of disturbance at the start of propagation. When σx∞/σy∞<cong>5, the intermediate phenomena between σx∞/σy∞=2 and 10 occur. Even the weak anisotropy of KIC 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 KIC.
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