Deformation and acceleration of Zn and Cu liners under explosive shock loading

Abstract

Both zinc and copper shaped charge jets (SCJs) generated from conical liners under explosive shock loading were observed using soft flash x-ray radiography. The goal was to ascertain the effect of the liner material melting point on the jet features and density. An analytical method termed in situ mass analysis from x-ray image processing (i-MAX) was utilized to estimate the mass and apparent density of each SCJ in this study. The masses determined for the zinc and copper leading jets were (34 ± 2) mg and (68 ± 3) mg, respectively. The overall mass distributions of both the zinc and copper SCJs showed the same tendency to decrease toward the tip of the jet, with the exception of the leading jet. The density distribution of the zinc SCJ gradually decreased toward the leading jet as it stretched. In contrast, the density distribution of the copper SCJ varied depending on the appearance of a necking region, and the minimum apparent density was observed 30 mm from the leading jet. These results demonstrate that the occurring of cavitation or vacancy avalanches in metal jet depend on the melting point of the liner material.