抄録
Lightweight polymeric materials are widely used in transportation machines as alternatives to metallic materials, since weight reduction of those machines is required to achieve low transportation cost by increased fuel efficiency, and demands for this material will obviously rise. However, the fracture toughness testing method in the polymeric material has not standardized in Japan. In this study, optical experiments by the method of transmitted caustics were carried out in order to construct the fracture toughness method in the polymeric material. The result shows a craze caused in the crack point has an influence on the fracture toughness value calculation by the method of transmitted caustics.
