对预成角薄板粘接接头强度及其应力分析

摘要

The influence of the preformed angle on the strength and stress distribution of 5052 aluminum alloy reverse-bent bonded joints was investigated using static experiment and finite element method (FEM).Experimental results show that the load bearing ability of adhesively bonded reverse-bent joint increases with the increase of the preformed angle.After the preformed angle reached a certain value,the load bearing ability and actual shear strength started to decrease.The results obtained from the finite element method analysis indicate that the preformed angle obviously affects the peel stress and the shear stress in mid-adhesive.The stress concentration in adhesive fillet decreases greatly when the preformed angle reaches a certain value,and then aggravates with the increase of the preformed angle.%通过静力学实验研究了预成角对5052铝合金板材粘接接头强度的影响.对0°至15 °预成型粘接接头进行强度对比研究,结果表明:被粘物搭接端的预成角对粘接接头承载能力有显著影响,预成角与接头强度呈抛物线关系,即5052铝合金预成型粘接接头存在最佳预成角,此时接头的强度最大,偏离最佳角度接头强度降低;预成角越大,接头的位移就越大,粘接接头的储能能力就越大.建立预成角粘接接头有限元模型,分析粘接层应力分布.结果表明:预成角对粘接中心层的劈裂应力和剪切应力影响明显.预成角增大,粘接层的应力单调增加,而胶瘤部分的应力集中先缓解后加剧,呈抛物线变化趋势.