Nagahisa Ogasawara

Observation of Dynamic Deformation Behavior Around Interface of Bi-material Using DIC

In this study, the impact deformation behavior at the interface of a bi-material having different elastic wave velocities difference of each material is investigated. A split Hopkinson pressure bar method is used for the impact test. The deformation behavior of each material are observed using high-speed digital camera at the speed of one million frames per second and the strains distributions at the interface are measured using digital image correlation. The results are compared with the strains in a specimen without interface. The results show that the strain distribution in one material near the interface is affected by the strain in another material. The complicated deformation behavior is observed at the bi-material interface as the results of the interaction of elastic weaves in both materials.