Keeping good electrical contact at the armature/rail interface and the structural integrity of the armature during electromagnetic launching is critical to its performance. In this article, the influence of armature height on the erosion of armature’s tail is studied through experiments. The results of the armature current melt erosion (CME) of different linear current densities are summarized. For armatures with lower height, the CME tends to develop vertically, which is not conducive to keeping the structural integrity of the armature. For armature with higher height, the CME develops from the middle position of the armatures’ tails to both horizontal and vertical directions. In this article, the finite element software COMSOL is used to analyze the initial contact position of the armature/rail and the current density distribution of the armature/rail interface. The reasons for the starting position of armature CME and the differences in the morphology of armature CME in three different heights are explained. Finally, from the theoretical point of view, the influencing factors of armature CME are analyzed.

中文翻译：

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口径高度对轨道炮电枢电流熔体侵蚀的影响

在电磁发射过程中，在电枢/导轨界面处保持良好的电接触以及电枢的结构完整性对其性能至关重要。本文通过实验研究了衔铁高度对衔铁尾部腐蚀的影响。总结了不同线性电流密度的电枢电流熔蚀（CME）的结果。对于高度较低的电枢，CME趋于垂直发展，不利于保持电枢的结构完整性。对于高度较高的电枢，CME 从电枢尾部的中间位置向水平和垂直方向发展。在本文中，有限元软件COMSOL用于分析电枢/导轨的初始接触位置和电枢/导轨界面的电流密度分布。解释了电枢CME起始位置的原因以及三种不同高度电枢CME形态的差异。最后，从理论的角度分析了电枢CME的影响因素。