Research on bending and deviating effects of passive electromagnetic armor on shaped-charge jet

Abstract

The lateral deviation and bend of shaped-charge jet (SCJ) are generated when the SCJ penetrates the passive electromagnetic armor (EMA). The lateral deviation is caused by the transverse electromagnetic force and the bend is caused by kinking instability and the transverse electromagnetic force, bending and lateral deviating effects coexist and affect the penetration of SCJ together. In this paper, two 3-D simulation models are developed to study bending and deviating effects produced by passive EMA on SCJ. After all, the static analog experiments proceed by copper wire which diameter is 2mm, the bending degree increases with the rising of voltage, when charging pulse voltage exceeds to several kilo-voltage, the breakup of copper wire appears. Besides, the protected experiments of the passive electromagnetic armor against SCJ proceed by armor piercing projectiles, the deviation of SCJ can be seen from the splash on the back plates. The results of simulations and experiments demonstrate that deviating and bending of SCJ can destroy the axial continuity of SCJ remarkably, which decreases the penetration of SCJ and improves the defense performance of passive electromagnetic armor ultimately.