Analysis of Shell Material Influence on Detonation Process in High Explosive Charge

摘要

The influence of the shell material (copper and silicon carbide) on the detonation process in a cylindrical high explosive charge is experimentally and numerically investigated. We observed significant differences in wave patterns in detonation products and in shells, which were caused by differences in sound velocities in the shells and by rapid destruction of the ceramic shell under explosion loading. Peculiar features of the wave pattern at the HE/ceramics interface caused by desensitization of explosive under loading by an advanced wave in the shell were investigated. Those features lead to a decrease of the detonation pressure, an increase of mass velocity behind the detonation front that is typical for under-compressed detonation. On the symmetry axis of the HE charge in the ceramic shell behind the detonation front a long zone with nearly constant pressure was observed. We have identified the mechanism of transmission of perturbations from the periphery to the symmetry axis of the charge to be the propagation of transverse waves directly behind the detonation front from the periphery to the symmetry axis of the charge.