Effect of angle deflection on deformation characteristic and mechanical property of electromagnetic riveted joint
Effect of angle deflection on deformation characteristic and mechanical property of electromagnetic riveted joint
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DOI：
10.1007/s00170-021-06621-6
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发表时间：
2021-01-19
影响因子：
3.4
通讯作者：
Jiang, Hao
中科院分区：
文献类型：
--
作者：
Duan, Liming;Feng, Xuerui;Jiang, Hao
在自动电磁铆接过程中，冲头与铆钉之间容易出现定位偏差。这导致了铆钉尾部的不对称变形，影响了铆接接头的性能。本文制备了不同角度挠度(0度、2度、4度、6度)的铆接试件，研究了角度挠度对电磁铆接接头变形特性和力学性能的影响。通过金相组织观察、干涉分析、硬度测试和剪切拔出试验，评价了铆接接头的性能。结果表明，角度偏差对铆接接头的变形特性和力学性能有显著影响。与挠度为0度的铆接相比，挠度为2度、4度和6度的铆接接头的铆钉轴将发生倾斜。铆钉轴的倾斜造成了铆接板之间的相对位移，并在铆钉轴和铆接板之间产生了间隙，影响了铆接接头的干涉。铆接接头的力学性能随角挠度的增大而降低。在剪切试验中，破坏形式均为铆钉破坏，断裂位置均在铆钉轴的中部。对于拔出测试，有三种失败模式。此外，本文还初步判断了自动电磁铆接接头的可靠性，为自动电磁铆接技术的工程应用提供了科学指导。
During automatic electromagnetic riveting, the positioning deviation between punch and rivet is easy to occur. This leads to the asymmetric deformation of rivet tail and affects the performance of riveted joint. In this paper, the riveted specimens under various angle deflections (0 degrees, 2 degrees, 4 degrees, 6 degrees) were prepared to investigate the effect of angle deflection on deformation characteristic and mechanical property of electromagnetic riveted joint. The microstructure observation, interference analysis, hardness measurement, and shear and pull-out test were performed to evaluate the performance of riveted joints. Results showed that the angle deflection had significant effects on the deformation characteristics and mechanical properties of riveted joints. Compared to the riveted joint with 0 degrees angle deflection, the rivet shaft of riveted joints with 2 degrees, 4 degrees, and 6 degrees angle deflection would tilt. The tilt of the rivet shaft caused relative displacement between riveted sheets and generated a clearance between the rivet shaft and riveted sheets, affecting the interference of riveted joints. The mechanical property of riveted joint decreased with the increase of angle deflection. For shear tests, the failure modes were all rivet failure, and the rupture positions were all in the middle portion of the rivet shaft. For the pull-out test, there were three failure modes. In addition, the reliability of automatic electromagnetic riveted joint could be preliminarily judged by this work, which provided scientific guidance for the engineering application of automatic electromagnetic riveting technology.