抄録
To evaluate arbitrary shaped defects or cracks terminating at an interface, a formula is proposed in terms of Murakami's √area parameter for the maximum stress intensity factors. Here “area” is the projected area of the defects or cracks. First, the solution for a rectangular crack, which is perpendicular to and terminating at a bimaterial interface, is considered with varying the aspect ratio of the crack and combinations of materials constants systematically. Then, the maximum stress intensity factors at the other side of the interface are expressed as a function of the elastic ratio of the materials. On the other hand, the general stress intensity factors at the interface is expressed as a function of Dundurs parameters α and β. Those expressions are usefully evaluating the defects under any combinations of the materials.
