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Study on the effects of transverse ultrasonic vibration on deformation mechanism and mechanical properties of riveted lap joints
Ultrasonics ( IF 4.2 ) Pub Date : 2021-04-24 , DOI: 10.1016/j.ultras.2021.106452
Xingxing Wang 1 , Zhenchao Qi 1 , Wenliang Chen 1 , Yexin Xiao 1
Affiliation  

In this paper, a new and special transverse ultrasonic vibration-assisted riveting (TUVR) system is developed to improve the plasticity and qualification of titanium alloy rivets. Comparing with conventional riveting (CR), the formed driven heads by TUVR are not only suffered from the riveting force and hole boundary constrain, but also the acoustic softening and dragging friction force. Consequently, to disclose the deformation mechanism and mechanical properties in driven head, a series of studies were carried out. First, the dimensions of driven head for different amplitudes and roughness were investigated. On this basis, the typical position microstructures in driven head of TUVR and CR were contrastively analyzed. Moreover, the interference sizes of laminates riveted lap joints under CR and TUVR were compared. Finally, the micro-hardness and pull-out strength in joints of two riveting processes were tested, and illustrating the mode and microstructure of failure. Results show that ultrasonic vibration can act as a new and effective auxiliary riveting method, which contributes to achieving plasticity improvement and higher mechanical properties of joints. Although the TUVR has significant effects on the deviation of the driven head, which can be restrained well with a reasonable amplitude and roughness. The grains deformation in typical positions of TUVR is much severer than CR, except in the lower shear band and difficult deformation area. Besides, the uniformity of interference sizes of riveted sample is well improved by TUVR. The experimental results show that the micro-hardness and yield load of TUVR riveted lap joints increase more than 10% and 4%, respectively.



中文翻译:

横向超声振动对铆接搭接接头变形机理及力学性能影响的研究

在本文中,开发了一种新的特殊横向超声振动辅助铆接(TUVR)系统,以提高钛合金铆钉的塑性和质量。与传统铆接(CR)相比,TUVR成型的驱动头不仅受到铆接力和孔边界约束,而且还受到声学软化和拖曳摩擦力的影响。因此,为了揭示从动头的变形机制和力学性能,进行了一系列研究。首先,研究了不同振幅和粗糙度的驱动头尺寸。在此基础上,对比分析了TUVR和CR从动头的典型位置显微组织。此外,比较了 CR 和 TUVR 下层压板铆接搭接接头的干涉尺寸。最后,测试了两种铆接工艺接头的显微硬度和拉拔强度,并说明了失效模式和微观结构。结果表明,超声振动可以作为一种新型有效的辅助铆接方法,有助于提高接头的塑性和机械性能。虽然TUVR对从动头的偏差有显着影响,但在合理的幅度和粗糙度下可以很好地抑制。除低剪切带和难变形区外,TUVR 典型位置的晶粒变形比 CR 严重得多。此外,TUVR 还可以很好地提高铆接样品干涉尺寸的均匀性。实验结果表明,TUVR铆接搭接接头显微硬度和屈服载荷分别提高10%和4%以上,

更新日期:2021-06-08
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