Modeling of expansion dynamics of explosively driven metal cylinders

Abstract

The paper considers acceleration of a cylindrical metal liner by expanding products of internal detonation. A new analytical model of liner motion is developed for the case of axial initiation of an explosive charge. The suggested model relies on the two-stage regime of cylinder motion. The first stage considers the interaction of detonation wave and metallic liner, resulting in the initial velocity imparted to the liner. The second stage is gas-dynamic push of the cylinder governed by detonation products expansion, similarly to the Gurney approach. Numerical simulation of explosive propulsion of a cylinder is performed using FEM-based software Abaqus/Explicit. Results of the analytical model are validated by comparison with available experimental data and simulation results.