基于ABAQUS的热辅助铆接分析

针对大直径、难成形合金材质铆钉在常规铆接过程中易出现变形开裂、干涉量不足等问题,提出将铆钉先"预热"处理,再进行铆接的连接方法。利用有限元分析软件,以7075铝合金材料建立有限元模型,模拟在不同温度、不同铆接速率下,铆钉的变形及受力情况。研究表明:随着热辅助铆接温度的升高,压铆力的减少幅度呈现先升高后降低的趋势,较小的压铆力能够减小钉杆开裂的风险;合适的铆接速率也能改善热辅助铆接的铆接品质,提高疲劳寿命。这种热辅助铆接技术对于今后铆钉铆接的技术工艺具有一定的参考价值。

Heat assisted Riveting Analysis Based on ABAQUS

In view of the problems of large diameter and difficult-to-shape alloy rivets,such as deformation,cracking and insufficient interference,etc.,rivets were firstly preheated and then riveted.Finite element analysis software was used to establish the finite element model of 7075 aluminum alloy,in order to simulate the deformation and stress of rivets at different temperatures and different riveting rates.The results show that with the increase of heat-assisted riveting temperature,the reduction of riveting force tends to increase firstly and then decrease,and the smaller riveting force can reduce the risk of nail cracking.The suitable riveting rate can also improve the riveting quality of heat-assisted riveting,and improve fatigue life.This heat-assisted riveting technology for the future riveting technology of rivet has a certain reference value.