衝撃負荷下における構造用接着剤のモードI破壊じん性の評価

抄録

Adhesively bonded joints have been widely used in various engineering products, such as automobiles, ships and airplanes, due to the advantages of adaptation for dissimilar materials bonding. The strength of the joints is one of the important factors in terms of product safety. Double cantilever beam (DCB) test is a standardized evaluation method for the mode I fracture energy (G_IC) of the adhesively bonded joints under quasi-static conditions. Also under impact conditions, various tests have been introduced because of the importance of impact resistance for the safety of the vehicles. However, impact loading makes it difficult to measure the G_IC, and the evaluating techniques under impact loading conditions have not well established. In this study, the DCB tests under impact loading conditions were conducted using a falling-wedge impact-testing machine and a high-speed camera, and the change in the fracture energy G_IC was investigated in comparison with the results under the static loading conditions.