Calculations of Deposition Layer Remelting Using Stefan Condition Method in Rail Launcher

During the process of electromagnetic launch, there is a mega-ampere pulse current at the armature/rail(A/R) interface, and the relative sliding speed is hundreds of meters per second. Therefore, a large amount of Joule heat and friction heat at the A/R interface will be generated to melt and wear the armature, then the molten aluminum will be solidified and deposited on the surface of the rail and form a deposition layer. At the same time, the interfacial deposition layer will also be distributed with a huge amount of heat, even lead to remelting. In this paper, based on the Stefan condition method, a calculation model of the remelting characteristics of the deposition layer is established, which is used to analyze the remelting characteristics of the deposition layer of the large-caliber armature in the full current stage. Additionally, the effects of the linear current density, contact resistance and velocity of the armature on the remelting thickness of the deposition layer are analyzed.