The process of perforation of a target involving plug formation and ejection at impact velocities of 101-260 м/с was investigated using a high-speed infra-red camera CEDIP Silver 450M. It is shown that the distribution of strain is relatively uniform in the initial penetration region with a smooth mirror-like fracture surface, whereas in the plug formation and ejection regions it becomes essentially non-uniform along the radius of a normal to the sample surface. Localization of plastic strain occurs in a thin region providing the plug formation. As the plug moves, the surface relief undergoes the roughening effect and the local inhomogeneities of shear deformation become larger.
|
