Shock-induced conductivity waves in metallic samples

Abstract

In connection with the problem of experimental research of shock-wave metal-metal transitions, analysis is given of electromagnetic processes inside a current-carrying conductor whose electrical conductivity changes under the shock-wave action. The combined effect of electromagnetic field diffusion, shock-wave front propagation, and substance compression lead to qualitative changes in current distribution over the sample. The initial and final stages of shockwave motion are characterized by the appearance of a countercurrent in a surface layer of the sample. Based on the study performed, a new approach to measuring the electrical conductivity of metallic samples is proposed. This approach is free from limitations on the thickness of the sample under study and is based on the solution of the inverse problem of magnetic field diffusion in a shock-compressed sample. The experimentally recorded sample surface voltage value serves as input information for the conductivity recovering procedure.