A Study on Super Speed Forming of Metal Sheet by Laser Shock Waves

查看全文 作　　者：ZHOU Jian-zhong 1, YANG Ji-chang 1, ZHANG Yong-kang 1, ZHOU Ming 2 (1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, 21 2013 China;2. School of Material Science and Engineering, Jiangsu University, Zhenjiang 21 2000, China) 出　　处：《厦门大学学报(自然科学版)》索引2002年第41卷第S1期,共2页 基　　金：Projectsupportedby 863ProgramFundsofChina(2 0 0 2AA3 3 60 3 0 )andJiangsuNaturalScienceFunds (0 2KJB4 60 0 0 3 ) 摘　　要：Metal sheet plastic deformation or forming is gener at ed through a mechanical pressure or a thermal variation. These pressure variatio ns or thermal variations can be created by a variety of means such as press form ing, hydroforming, imploding detonation and so on. According to the magnitude of the strain rates all these forming methods can be divided into quasi-static fo rming and dynamical forming. Up to now there are no reports of forming methods w ith the strain rates above 10 5sec -1, even though the exploding forming. In this article, we work on a dynamic super-speed forming method driven by lase r shock waves and advanced a novel concept of laser shock forming. The initial o bservation of the laser shock forming is done through a bugle testing with speci mens of SUS430 sheet metal, using a neodymium-glass laser of pulse energy 10J~ 3 0J and duration of 20 ns (FWHM). The investigation revealed that the plastic de formation during the laser shock forming is characterized as ultrahigh strain ra te up to 10 7sec -1. We indicate that plastic deformation increases nonlin early when the energy density of the laser varies. By investigating the hardness and residual stress of the surfaces, we conclude that laser shock forming is a combination technique of laser shock strengthening and metal forming for introdu cing a strain harden and a compressive residual stress on the surface of the wor k-piece, and the treated surface by laser shock forming has good properties in fatigue and corrosion resistance. This technique can achieve forming wit h or without mould. 关 键 词：laser shock wave metal sheet forming ultrahigh strain rate residual stresses