Microstructure evolution of AA5052 joint failure process and mechanical performance after reconditioning with tubular rivet  

AA5052接头失效过程的显微组织演变与空心铆钉修复接头的力学性能

作　　者：Xiao-qiang REN Chao CHEN Xiang-kun RAN Yu-xiang LI Xin-gang ZHANG 任晓强;陈超;冉向坤;李宇翔;张新刚(中南大学轻合金研究院,长沙410083;中南大学高性能复杂制造国家重点实验室,长沙410083;中南大学机电工程学院,长沙410083)

机构地区：[1]Light Alloy Research Institute,Central South University,Changsha 410083,China [2]State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China [3]School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第11期3380-3393,共14页中国有色金属学报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China (No. 51805416);the Young Elite Scientists Sponsorship Program by CAST, China (No. YESS20200279);the Natural Science Foundation of Hunan Province, China (No. 2020JJ5716);the Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University, China (No. ZZYJKT2019-01);the Hunan Provincial Natural Science Foundation for Excellent Young Scholars, China (No. 2021JJ20059);the Huxiang High-Level Talent Gathering Project of Hunan Province, China (No. 2019RS1002)。

摘　　要：To extend the service life of the clinched joint,a reconditioning process conducted with an additional tubular rivet was proposed in this work.Different reconditioning forces were employed to produce dissimilar reconditioned joints by experimental method.The experimental results indicated that the neck fracture was the common failure mode of both original clinched and reconditioned joints.Compared with the original clinched joint,the shearing strength of the reconditioned joint produced by a reconditioning force of 40 kN increased from 1810.5 to 1986.47 N,and the energy absorption increased from 2.34 to 3.46 J.The range of effective reconditioning force was from 35 to 40 kN and 40 kN was the best choice for reconditioning the AA5052 failed joints.The mechanical properties of the reconditioned joints are obviously better than those of the original clinched joints,which fully demonstrates that the reconditioning method proposed in this work has a broad prospect of industrial application.为了延长无铆连接接头的使用寿命,提出一种采用空心铆钉进行修复的失效接头修复工艺。通过实验的方法,采用不同的修复力对失效无铆接头进行修复。结果表明,原始无铆接头和修复接头的失效形式一致,皆为颈部断裂失效模式。与原始无铆接头相比,当修复力为40kN时,修复接头的抗剪载荷由1810.5N增加到1986.47 N,能量吸收值由2.34 J增加至3.46 J。所研究的有效修复力范围为35~40 kN,对于失效AA5052无铆接头,其最优的修复力为40kN。修复接头的力学性能明显优于原始无铆接头的力学性能,这充分说明本研究提出的无铆连接失效接头的修复工艺具有广阔的工业应用前景。

关 键 词：mechanical reconditioning clinched joining tubular rivet failure mode 

分 类 号：TG146.21[一般工业技术—材料科学与工程]