抄録
In this paper, static and dynamic stress intensity factors of the interfacial crack were determined by photoelasticity and caustics method, and the fracture toughness of the interfacial crack was examined. The shearing deformation behavior of the interfacial crack was experimented on with the ENF specimen. Epoxy resin and the polycarbonate were used for the attendant test material. As a result, the fracture toughness and the direction of the crack propagation in the interfacial crack showed a result different according to the bonding condition. When the upper phase material was brittle material, the fracture toughness of the interfacial crack was a low value. And, the crack propagated to the upper phase, and the crack propagation angle was 1.22 rad. However, when the upper phase was ductile material, the fracture toughness was a high value. And, the crack has propagated to the joint surface of the interface. The fracture toughness of the upper phase material influences these tendencies. In addition, these became similar tendencies because of the static and impact test. Therefore, the fracture toughness of the material, which receives the load, determines the fracture toughness of the interfacial crack and the direction of the crack propagation.
