摘要
选取5组不同厚度组合的碳纤维复合材料(CFRP)板和铝合金板进行自冲铆连接对比试验,并限定板厚组合为唯一的影响因素,以探索板厚组合对自冲铆接头底切值的影响规律。结果表明,CFRP上板厚度固定,接头底切值随着下板厚度的增加而提升,而固定铝合金下板厚度,接头底切值则随上板厚度的增加而降低。分析认为,铝合金下板的厚度限制钉脚刺入下板的深度并决定了底切值的上限,同时,自冲铆过程中铆钉钉脚切割上板形成的残余材料堆积于钉孔内,并在钉脚刺入铝合金下板过程中对下板产生挤压作用,导致钉孔下方的下板被压薄,且对下板的压薄作用随着上板厚度的增加而增强,从而接头的底切值随着上板厚度增加而下降。
Five sets of carbon fibre reinforced plastics(CFRP)plates and aluminum alloy plates with different thickness combinations were selected for comparative testing of self-piercing riveting(SPR)connection,and the plate thickness combination was limited as the only influencing factor to explore the influence laws of plate thickness combination on the undercut value of SPR joint.The results show that when the thickness of the CFRP upper plate is fixed,the joint undercut value increases with the increase of the lower plate thickness,while when the aluminum alloy thickness lower plate is fixed,the joint undercut value decreases with the increase of the upper plate thickness.Analysis suggests that the aluminum alloy lower plate thickness limits the penetration depth of the rivet toe into the lower plate and determines the upper limit of the undercut value.At the same time,the residual material formed by cutting of the rivet shank into the upper plate accumulates in the rivet hole during the SPR process,which compresses the lower plate during the penetration of the rivet toe into the aluminum lower plate.This results in the lower plate thickness below the rivet hole being reduced,and the thinning effect on the lower plate increases with the increase of the upper plate thickness,resulting in the decrease of the joint undercut value with the increase of the upper plate thickness.
作者
符平坡
丁华
曾祥瑞
罗时清
周长学
FU Ping-po;DING Hua;ZENG Xiang-rui;LUO Shi-qing;ZHOU Chang-xue(Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo 315336,China;School of Mechanical Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2024年第9期127-134,共8页
Journal of Plasticity Engineering
关键词
碳纤维复合材料
铝合金
自冲铆
板厚组合
底切值
carbon fibre reinforced plastics
aluminum alloy
self-piercing riveting
plate thickness combination
undercut value
