Joule Heating of a Shaped-Charge Jet Formed by the Collapse of a Conical Metal Liner in a Magnetic Field
S. V. Stankevich1,2, G. A. Shvetsov1,2
1Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: explosion, shaped-charge lining, magnetic field, induction heating, ultimate elongation
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 preliminary generated. The problem is considered in an axisymmetric two-dimensional non-stationary formulation. The final 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.
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