Abstract This paper presents an experimental and numerical study on laser shock clinching (LSC) for joining copper foil and perforated stainless steel sheet. The deformation evolution of an interlock was discussed by analyzing the cross sections and thickness distribution of the specimens. Failure modes and failure mechanism in the joining process were discussed to obtain a better understanding of the process. Fracture of copper foil commonly takes place at the hole edge and the base of clinch, meanwhile, the region with large strain concentration was more likely to generate fracture. The effect of main process parameters on the joining conditions has been investigated and process windows have been made based on a series of experiments. The results show that good joining can only be obtained under the combination of moderate laser energy and forming height. Clinched joints produced in the LSC process can absorb both radial and axial force, while shearing strength was far larger than peeling strength of the clinched joints produced under the same experimental parameters. What’s more, the LSC process has then been simulated by finite element method (FEM). FEM results agree well with the experimental results, which implies that numerical simulation can be effectively used to analyze the deformation and the failure mechanism in the LSC process.

中文翻译：

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铜箔与不锈钢穿孔板激光冲击铆接的实验与数值研究

摘要 本文介绍了用于连接铜箔和穿孔不锈钢板的激光冲击铆接 (LSC) 的实验和数值研究。通过分析试样的横截面和厚度分布，讨论了互锁的变形演变。讨论了连接过程中的失效模式和失效机制，以更好地了解该过程。铜箔断裂多发生在孔口边缘和铆接底部，同时应变集中大的区域更容易产生断裂。研究了主要工艺参数对连接条件的影响，并根据一系列实验确定了工艺窗口。结果表明，只有在适度的激光能量和成型高度的组合下才能获得良好的接合。LSC工艺生产的铆接接头可以同时吸收径向和轴向力，而剪切强度远大于相同实验参数下生产的铆接接头的剥离强度。更重要的是，LSC 过程已通过有限元方法 (FEM) 进行模拟。有限元结果与实验结果吻合较好，表明数值模拟可以有效地用于分析LSC过程中的变形和破坏机制。然后通过有限元方法 (FEM) 模拟 LSC 过程。有限元结果与实验结果吻合较好，表明数值模拟可以有效地用于分析LSC过程中的变形和破坏机制。然后通过有限元方法 (FEM) 模拟 LSC 过程。有限元结果与实验结果吻合较好，表明数值模拟可以有效地用于分析LSC过程中的变形和破坏机制。