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-  2018 

铝合金泡沫金属夹层板自冲铆接头力学性能研究
Study on mechanical properties of self-piercing riveted joints of aluminum alloy metal foam sandwich sheet

DOI: 10.7520/1001-4888-17-020

Keywords: 自冲铆 泡沫金属 夹层板 力学性能 断口分析
self-piercing riveting metal foam sandwich sheet mechanical properties fracture analysis

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Abstract:

对AA5052铝合金泡沫金属夹层板进行自冲铆接试验,对接头的可连接性进行探究。通过静力学试验对比各组接头的静力学性能,分析不同种类泡沫金属对自冲铆接头力学性能的影响;用扫描电子显微镜对接头典型断口进行研究,分析其微观失效机理。结果表明:自冲铆技术可以实现泡沫金属夹层板的有效连接,接头具有良好的成形质量;泡沫金属夹层提高了自冲铆接头的静力学性能,其中泡沫镍夹层使AA5052自冲铆接头静失效载荷提高了4.1%;夹层板自冲铆接头失效形式均为铆钉与下板分离,其中泡沫铁镍夹层自冲铆接头下板铆扣断裂区域粘附在铆钉脚底部,为韧性断裂机制;下板内锁区域失效时铆钉与下板发生剧烈刮擦,呈现具有分层现象的片状组织。
Self-piercing riveting tests of AA5052 aluminum alloy metal foam sandwich sheet was carried out to investigate the join-ability. Static properties of each group of joints were compared by static tests, and the influnence of different kinds of metal foam on mechanical properties of self-piercing riveted joints were analyzed. Typical joint fracture was investigated by scanning electron microscope, and the microscopic failure mechanism was analyzed. Results show that self-piercing riveting can realize effective connection of metal foam sandwich sheet, and the joint has good forming quality. The metal foam interlayer improves the static performance of self-piercing riveted joint. Among them, the nickel foam interlayer makes static failure load of AA5052 self-piercing riveted joint to increase by 4.1%. The failure mode of self-piercing riveted joint of sandwich sheet is the separation of rivet from lower sheet. The fracture region of the lower sheet of self-piercing riveted joint of iron-nickel foam sandwich sheet attached at the bottom of the rivet tail, exhibiting ductile fracture mechanism; the rivet and the lower sheet scratch violently when the inner lock region fails, showing a lamellar structure with delamination

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