JOULE HEATING OF A SHAPED-CHARGE JET FORMED BY THE COLLAPSE OF A CONICAL METAL LINER IN A MAGNETIC FIELD

Abstract

This paper presents the results of numerical simulation of magnetic field cumulation and the Joule heating of shaped-charge jets produced by explosive compression of a metal cone in which a magnetic field was pre-generated. The problem is considered in a two-dimensional axisymmetric non-stationary formulation. The finite electrical conductivity of the cone material is taken into account, and various methods of generating the initial magnetic field (using one or two solenoids) are considered. It is found that that during cone compression, the magnetic field induction can increase several hundred-fold. For a relatively low initial magnetic field induction on the cone axis (\(0.09{-}0.17\) T), the temperature increase near the axis of the shaped-charge jet due to heating by eddy currents is \(200{-}300\)°C. This heating can be accompanied by thermal softening of the shaped-charge jet material and an increase in its ultimate elongation and hence penetration capability.