激光冲击微铆接工艺及其研究进展

The process and development of laser shock micro-clinching

激光冲击微铆接工艺利用短脉冲强激光与材料相互作用时产生的等离子体冲击波使材料发生塑性变形而实现机械互连。介绍了激光冲击微铆接工艺机理和工艺实现的关键技术,综合评述了激光冲击参数、模具结构参数和材料特征参数对接头成形及其力学性能的影响规律,着重总结了异质金属材料激光冲击微铆接的研究成果。分析了目前研究中存在的不足,从微观结构演变规律、尺度效应影响、铆接缺陷抑制方法、接头失效行为等方面展望了激光冲击微铆接工艺的研究方向,以期为深入系统开展激光冲击微铆接应用基础研究提供参考。

Laser shock micro-clinching is a novel joining method in which the metal foil is plastically deformed under pulsed laser induced shock wave,and then two or more metal foils can be joined together based on plastic deformation.The process mechanism and the key technologies of laser shock micro-clinching are introduced.The influences of laser shock parameters,die structure and material properties on joint formation and mechanical performance are comprehensively offered.The advances in laser shock micro-clinching of dissimilar materials are emphasized.In addition,the insufficiency of previous works is analyzed,and then the trend and the prospective of research are discussed in terms of micro-structure evolution,size effects,defects controlling methods and joint failure behavior.The research can provide a reference for further investigation on laser shock micro-clinching process.