On Temperatures in Shaped-Charge Jet Penetration

Abstract

Jet and target temperatures during penetration are computed using the compressible jetpenetration model of Flis [1] for several materials. The model considers only the hydrodynamic compression work and shock heating and neglects plastic-work, phase-change, and heat-conduction effects. The model is here extended to predict also the residual jet and target temperatures after return to ambient pressure. Previously measured temperatures of projected jets are taken as initial jet conditions for the penetration. The model predicts that temperatures exceeding 2000 K may be reached in targets at practical shaped-charge-jet velocities. Much more of the temperature increase in more compressible materials (polymers and liquids) at high jet velocities is attributable to shock heating than to isentropic compression work behind the shock. The temperature increase in the jet depends strongly on its initial temperature.