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为提高装甲防护性能,对被动电磁装甲中金属射流所受箍缩电磁力作用进行了研究。在等效电路模型基础上,给出了与箍缩电磁体积力等效的表面电磁压强理论公式,分析了等效表面电磁压强随时间振荡衰减变化的规律;通过分析平均等效表面电磁压强的临界现象,认为金属射流半径与趋肤深度的比值r槇<1时,平均等效表面电磁压强会随相对半径的减小而急剧增大。数值模拟和理论分析结果都显示:在合适参数下,平均等效表面电磁压强会在金属射流较细部位急剧增加,从而导致腊肠不稳定性。5kV被动电磁装甲试验结果显示:金属射流受箍缩电磁力影响后,在后效靶板上的穿孔直径明显比不加电情况大。上述研究进一步完善了被动电磁装甲对破甲弹的防护机理,对被动电磁装甲的应用具有一定的指导意义。
In order to improve armor protection performance, the effect of pinching electromagnetic force on metal jets in passive electromagnetic armor was studied. Based on the equivalent circuit model, the theoretical formula of surface electromagnetic pressure equivalent to the pinching force of the pinched electromagnet is given. The law of the change of the electromagnetic vibration of the equivalent surface with time is analyzed. By analyzing the average equivalent surface electromagnetic pressure Critical phenomenon, that the metal jet radius and skin depth ratio r 槇 <1, the average equivalent surface electromagnetic pressure with the relative radius decreases sharply increased. The results of numerical simulation and theoretical analysis show that the average equivalent surface electromagnetic pressure will increase sharply at the fine part of the metal jet under suitable parameters, resulting in the instability of the sausage. The results of 5kV passive electromagnetic armor test show that after the metal jet is influenced by the pinching electromagnetic force, the perforation diameter of the after-effect target plate is obviously larger than that without power. The above study further perfected the protective mechanism of the passive electromagnetic armor on the armor-piercing projectile, which is of guiding significance to the application of passive electromagnetic armor.