碳纤维-铝合金电磁铆接工艺及性能研究  

Study on Process and Mechanical Properties of CFRP/Al Electromagnetic Riveted Structures

作　　者：蒋浩 廖宇轩 李光耀[1] 崔俊佳[1] JIANG Hao;LIAO Yu-xuan;LI Guang-yao;CUI Jun-jia(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《精密成形工程》2021年第4期37-44,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(52005173);博士后创新人才支持计划(BX20200123);长沙市自然科学基金(kq2014047)。

摘　　要：目的研究不同工艺参数下碳纤维-铝合金电磁铆接接头的力学性能。方法利用电磁铆接技术对直径为Ф5 mm的2A10铝合金铆钉、厚度为2.0 mm的T300碳纤维复合材料和1.8 mm的5182铝合金板料进行铆接,借助金相显微镜和万能试验机对接头的微观形貌和力学性能进行观察和测试。结果随着电磁铆接放电能量的增加,铆钉镦头高度逐渐减小,直径逐渐增大。具体地,当放电能量从4.0 kJ增加至5.5 kJ时,H/H_(0)(镦头高度/外伸量)从0.36减小至0.17,而D/D0(镦头直径/铆钉直径)从1.25增长到1.68。通过金相观察结果可知,D/D_(0)=1.4,1.5,1.6这3种类型的铆钉镦头均产生了绝热剪切带,其中下剪切带几乎消失,上剪切带较为明显,并且随着D/D0的增大,绝热剪切带越来越明显。力学性能测试结果表明,随着D/D0增加,碳纤维-铝合金电磁铆接接头的剪切性能随之变强,其中D/D0=1.6接头的最大剪切力达到最大。结论在不同性能指标下,电磁铆接接头的最佳工艺参数有所不同。当考虑接头的微观组织等性能指标时,放电能量5.0 kJ(D/D_(0)=1.5)为最佳工艺参数;当考虑接头的剪切性能等因素时,放电能量5.3 kJ(D/D_(0)=1.6)为最佳工艺参数。This paper aims to investigate the process and mechanical properties of Carbon Fiber Reinforced Plastic(CFRP)/Al electromagnetic riveted joint under different process parameters.TheΦ5 mm 2A10 aluminum rivet,T300CFRP with thickness of 2.0 mm,and 1.8 mm of 5182 aluminum alloy were riveted by electromagnetic riveting technology.The microstruc-ture and mechanical properties of the joint were tested by metallographic microscope and universal testing machine.With the increase of the discharge energy,the height of the riveting head decreased and the diameter increased.Specifically,when the discharge energy increased from 4.0 kJ to 5.5 kJ,H/H_(0)(head height/rivet overhang)decreased from 0.36 to 0.17,while D/D_(0)(head diameter/rivet diameter)increased from 1.25 to 1.68.The metallographic results showed that the three types of riveting heads(D/D_(0)=1.4,1.5 and 1.6)had adiabatic shear bands(ASBs).The upper shear zone was more obvious,while the lower shear zone almost disappeared.Whatʹs more,the ASBs became more obvious with the increase of D/D0.The mechanical properties test results showed that with the increase of D/D_(0),the shear performance of CFRP/Al electromagnetic riveted joint became beneficial.The riveting head of D/D_(0)=1.6 had the maximum shear force.The optimum process parameters of the joint were different under different performance indexes.The discharge energy of 5.0 kJ(D/D_(0)=1.5)was the best process parameter when the microstructure indexes of the joint were considered.The discharge energy of 5.3 kJ(D/D_(0)=1.6)was the best process parameter when the shear performance of the joint was considered.

关 键 词：碳纤维 电磁铆接 微观组织 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]