Study of Shaped-Charge Collapse and Jet Formation Using the HEMP (Hydrodynamic, Elastic, Magneto, and Plastic) Code and a Comparison with Experimental Observations

摘要

The HEMP code was used to model shaped-charge collapse and jet formation processes for several charge configurations. Jet characteristics were determined by coupling the HEMP code output to the jet formation theory of Birkhoff, MacDougall, Pugh, and Taylor. A new feature of this study with HEMP is an explicit rule for determining when a liner segment collapses into the jet flow. Radiographs of shaped charges tested at BRL were compared to HEMP simulations of the collapse process and the jet velocity/mass distributions calculated for each modelled configuration. An experimental data base of velocity/mass distributions was obtained and compared with the calculated distributions. A one-to-one mapping was done showing each liner segment's position in the initial HEMP grid versus its relative position in the jet.