横向超声振动辅助Ti-45Nb铆钉成形性能研究

doi:10.3901/JME.2025.17.291

摘要/Abstract

摘要： 横向超声振动能场可以有效地改善钛合金材料塑性，为了进一步推动该技术在铆接中的应用，以碳纤维复合材料(Carbon fiber reinforced plastics，CFRP)叠层的Ti-45Nb铆钉连接为研究对象，对比分析在普通铆接和横向超声振动辅助铆接(Transverse ultrasonic vibration-assisted riveting，TUVAR)两种工艺下的连接域性能变化，开展了从微观特征到力学性能的影响机制的揭示。研究结果表明：相比于普通铆接，TUVAR的钛钉墩头剪切带变窄，在该区域的晶粒变形最大，而铆钉杆的晶粒形貌几乎未发生改变，但是墩头和铆钉杆的晶界角、晶界数量及织构取向均发生了显著的变化；由声残余硬化引起的铆钉墩头区域1的显微硬度显著增加；此外，TUVAR的试样的平均最大拉伸载荷提高了约4.35%，在40%F_ult，50%F_ult两个循环应力水平下，经过1×10⁶次疲劳加载后孔的相对变形量分别降低了28.0%和23.7%，在疲劳剩余强度分别提高了5.3%和3.2%。

关键词: 横向超声振动辅助铆接, CFRP叠层, 微观特征, 力学性能

Abstract: In our previous studies have found that transverse ultrasonic vibration technology can effectively improve the plasticity of titanium alloy materials. In order to further promote its application in riveting process, Ti-45Nb rivet connection of CFRP laminated as research object are compared and analyzed the connection domain performances by conventional riveting (CR) and transverse ultrasonic vibration-assisted riveting (TUVAR), and the influence mechanism from microscopic characteristics to mechanical properties is revealed. The researched results show that the shear band of the driven head became narrower under the TUVAR process, and the grains deformation is the largest in this region, the grain morphology of the rivet shaft hardly changed. However, the grain boundary angle, grain boundary number and texture orientation of the driven head and rivet shaft had significant changed. The micro-hardness of rivet driven head region 1 increased significantly due to the acoustic residual hardening effect. Comparing with CR’s specimens, the average maximum tensile load of TUVAR’s CFREP titanium riveted specimen is increased by about 4.35%; The relative deformation of the hole after 1×10⁶ fatigue loading of TUVAR specimens are reduced by 28.0% and 23.7% respectively Under cyclic stress levels of 40% F_ult and 50% F_ult, and the residual fatigue strength is increased by 5.3% and 3.2% respectively.

Key words: transverse ultrasonic vibration-assisted riveting, CFRP laminates, microstructure, mechanical property

中图分类号:

TG156

王星星, 李新, 施允洋, 潘海成, 丁家伟. 横向超声振动辅助Ti-45Nb铆钉成形性能研究[J]. 机械工程学报, 2025, 61(17): 291-299.

WANG Xingxing, LI Xin, SHI Yunyang, PAN Haicheng, DING Jiawei. Study on the Forming Performance of CFRP Laminates Riveted Lap Joints Assisted by Transverse Ultrasonic Vibration[J]. Journal of Mechanical Engineering, 2025, 61(17): 291-299.

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