玻璃纤维增强热塑性复合材料自冲铆接过程的数值研究  

Numerical investigation of self-piercing riveting process of glass fiber reinforced thermoplastics

作　　者：梁佳炜 黎雄 王凤江[2] 饶政华[1] LIANG Jiawei;LI Xiong;WANG Fengjiang;RAO Zhenghua(School of Energy Science and Engineering,Central South University,Changsha 410083,China;Provincial Key Lab of Advanced Welding Technology,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]中南大学能源科学与工程学院,长沙410083 [2]江苏科技大学先进焊接技术省级重点实验室,镇江212003

出　　处：《江苏科技大学学报（自然科学版）》2018年第5期678-683,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51575252)

摘　　要：随着玻璃纤维增强热塑性(GFRT)复合材料的推广应用,自冲铆接(SPR)技术作为GFRT板材的有效连接技术而获得关注.基于LS-DYNA建立了三维数值模型,研究以GFRT为工件的SPR过程及接头形成机理,分析了铆钉长度对SPR接头强度的影响,并实验验证了模拟结果的可靠性.研究表明:GFRT材料SPR接头形成的机理与金属材料不同,铆钉穿透GFRT工件后钉腿在底座及GFRT材料的挤压下向外张开,在工件上下侧形成机械锁而将工件紧扣在一起;铆钉下压过程中,铆钉的应力增加,钉腿变短变粗;以GFRT为工件的SPR接头强度随着铆钉长度的增加而增大,研究结果对GFRT材料SPR工艺的优化具有指导意义.With the increasing application of glass fiber reinforced thermoplastics(GFRT)composites,self-piercing riveting(SPR)processes is considered as an effective joining technology for GFRT material.In this paper,a three-dimensional numerical model is developed based on LS-DYNA to study the SPR process and joining mechanism for GFRT workpieces.The effects of the rivet length on the SPR joint strength are analyzed.The numerical model is verified by experimental result.The results show that the joining mechanism of SPR for GFRT is different from that for metallic materials.During SPR process,the rivet pieces through both the GFRT workpieces,and a mechanical interlock is formed to join the wokpieces under the impact of the die and GFRT material inside the rivet cavity.As the rivet moves downwards,the stresses in the rivet significantly increase,and the rivet leg becomes short and thick.For GFRT workpieces,the strength of final SPR joint increases as the length of rivet increases.This study is of great significance for the optimization of SPR technology of GFRT composites.

关 键 词：玻璃纤维增强热塑性复合材料 自冲铆接 数值模拟 

分 类 号：TH131.1[机械工程—机械制造及自动化]