動的DCB試験における破壊じん性の測定

抄録

Recently, automotive industry have paid attention to multi-material structures. Hence, joining methods for these dissimilar materials are the key to apply them into the structural parts of the vehicles in combination. Adhesive bonding can be one of the leading joining methods for the structural parts of vehicles. To apply adhesive joint to the parts of the vehicles, the characteristics such as strength and energy absorption under higher deformation rates should be known. Several tests have been proposed to evaluate the impact resistance of the joints. To evaluate the mode I fracture energy of adhesive joints, DCB(Double Cantilever Beam) tests have been standardized only under the quasi-static condition. To measure the mode I fracture energy under the impact loading condition, a falling-wedge impact test machine using DCB specimens were proposed by Xu and Dillard(2003). However, the inertial effects under dynamic condition have not considered. In this study, DCB tests under dynamic conditions were conducted using a falling-wedge testing machine and a high-speed camera. A mode I fracture energy for adhesive joint under dynamic condition is discussed.