Abstract Jet formation driven by strong magnetic field adopts the electromagnetic force to collapse the liner and breaks through the traditional jet forming mode of shaped charge, which relies on explosive. The influence of material strength on the liner deformation under low current is considered in this work to study the formation characteristics of the jet. Combined with the loading circuit, the jet formation and critical yield current (CYC) models are established. Subsequently, the CQ-4 device with 0.115 MJ energy is used to carry out electromagnetic loading experiments on the conical liners with a diameter of 10 mm and thickness of 1, 1.5, and 2 mm. The static penetration test method was used to test the jet power. The liners were all collapsed, and effective jets were formed by liners with 1 mm and 1.5 mm thickness. The depth of penetration (DOP) to the aluminum and steel targets were 30 mm and 12.5 mm, respectively. However, the 2 mm-thick liner almost did not have the ability to penetrate the steel target. The formation, movement, stretching, and penetration of the jets were calculation by theory and simulation. Results are in good agreement with the experiments. In the scope of this paper, the velocity and power of the jet increase with the decrease in liner thickness. The jet formation under theoretical calculation with and without material strength are compared and analyzed. The results indicated that the material strength cannot be ignored when the loading current is small. The formation characteristics of the liners under different loading currents are also calculated theoretically. The formation of the different liner elements under various currents are also calculated theoretically, and the peak current to CYC ratio is proposed to judge the formation state of the jet.

中文翻译：

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电磁力加载衬管射流形成与穿透的理论与实验研究

摘要 强磁场驱动的射流形成采用电磁力使衬管坍塌，突破了传统的聚能装药依赖炸药的射流形成方式。本文考虑材料强度对低电流下衬管变形的影响，研究射流的形成特性。结合加载电路，建立射流形成和临界屈服电流（CYC）模型。随后，利用能量为0.115 MJ的CQ-4装置对直径为10 mm、厚度为1、1.5和2 mm的锥形衬垫进行电磁加载实验。采用静态穿透试验法测试射流功率。衬垫全部塌陷，有效射流由1mm和1.5mm厚的衬垫形成。铝和钢目标的穿透深度 (DOP) 分别为 30 毫米和 12.5 毫米。然而，2毫米厚的衬里几乎没有穿透钢靶的能力。射流的形成、运动、伸展和穿透是通过理论和模拟计算得出的。结果与实验非常吻合。在本文的范围内，射流的速度和功率随着衬管厚度的减小而增加。对比分析了理论计算下有材料强度和无材料强度的射流形成。结果表明，当加载电流较小时，材料强度不可忽视。还从理论上计算了不同负载电流下衬垫的形成特性。