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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2447-07
连接条件对GFRTP自冲铆接性能影响的数值研究
黎雄1,饶政华1,王凤江2,梁佳炜1

(1. 中南大学 能源科学与工程学院,湖南 长沙,410083;
2. 江苏科技大学 先进焊接技术省级重点实验室,江苏 镇江,212003
)

摘 要: 采用LS-DYNA软件建立玻璃纤维增强热塑性复合材料(GFRTP)的自冲铆接(SPR)有限元模型,对SPR过程进行数值模拟和实验验证。通过比较应力分布、钉腿张开度及接头强度,分析底座几何形状及铆钉材料对GFRTP工件SPR过程及接头强度的影响。研究结果表明:与金属SPR接头钉腿被下工件完全包裹而形成自锁结构不同,GFRTP工件SPR接头的形成机理是钉腿穿透下工件而向外翻卷,与钉头一起形成机械锁。连接条件对GFRTP工件SPR性能有显著影响。在一定范围内,增大底座凸台倾角有助于提高SPR的自锁性能;增加铆钉材料强度,可有效提升SPR接头的强度。

 

关键字: 自冲铆接;数值模拟;强度测试;玻璃纤维增强热塑性复合材料

Numerical study of effects of joining conditions on performances of self-piercing riveted GFRTP
LI Xiong1, RAO Zhenghua1, WANG Fengjiang2, LIANG Jiawei1

1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Abstract:A finite element model of self-piercing riveting (SPR) of glass fiber reinforced thermoplastic (GFRTP) was developed based on LS-DYNA software. The SPR process was analyzed by numerical simulation and was validated by experiment. The effects of the die geometry and the strength of the rivet on the SPR performances of GFRTP workpieces were analyzed in terms of the stress distributions, the length of mechanical lock and the joint strength. The results show that the mechanism of SPR joint with GFRTP is different from that of metallic materials. The end of rivet leg for metallic workpieces is completely covered by the lower workpieces to form a self-locking structure; while for GFRTP workpieces the leg of rivet locks the workpieces together with the rivet head after it pierces through the workpieces and is warped outwards. The joining conditions have significant effects on the performances of SPR joints with GFRTP workpieces. Within a certain range, increasing the pip angle of die is useful for improving the self-locking performance of SPR joint, while increasing the strength of rivet can effectively improve the strength of SPR joint.

 

Key words: self-piercing riveting; numerical simulation; strength test; glass fiber reinforced thermoplastic

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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