Effect of shock-induced mesoscopic processes on dynamic strength of solids

Abstract
Dynamic deformation and fracture behavior of a series of metals under uniaxial strain conditions are studied by using light gas gun facility and velocity interferometer. In the majority of tests the thickness of target and impactor were adjusted to provide spallation. Spall-strength is found to be sensitively depended on the plastic instability of a material under compression. It is considered to be important strength-characteristic of material. Specifically, for all the tested material the value of instability threshold determined in uniaxial strain tests coincides with the strength-component of resistance to high-velocity penetration in Alekseevskii-Tate model.