Calculation and verification of pinch electromagnetic action on the shaped charge jet in the passive electromagnetic armor

To improve the defense ability of the armor, we studied pinch electromagnetic force which was suffered from shaped charge jet penetrated in passive electromagnetic armor. Based on the equivalent circuit model, the theoretical formula of surface electromagnetic pressure which was equivalent to the electromagnetic volume force was given, and the rule that the equivalent surface electromagnetic pressure concussively decays with time was analyzed. By analyzing the critical phenomenon of average equivalent surface electromagnetic pressure, the influence of the ratio of the shaped charge jet radius to skin depth r˜; on the threshold of the critical phenomenon was studied, and it was found that when r˜;