胶粘剂弹性模量对间隙接头应力和强度的影响

 运用弹塑性有限元法，研究了胶粘剂弹性模量对含间隙的铝合金单搭接接头的影响。通过分析胶层和被粘物的应力分布，结果表明：间隙连接对接头端部的应力分布无明显影响，但对间隙附近的应力峰值影响较大；随着胶粘剂弹性模量的增大，间隙附近的应力峰值反而减小；对于高弹性模量胶粘剂接头，间隙对接头的应力峰值无明显影响，在不降低接头名义强度的基础上极大地提高了接头的实际强度；而对于低弹性模量胶粘剂接头，间隙使得接头的应力峰值明显上升，显著地降低了接头的名义强度和实际强度。数值模拟结果与已发表的试验数据大致吻合。

Influence of Elastic Modulus of Adhesive on the Stress and Strength of Joint with Recessing

The effect of elastic modulus of adhesive on the str es s distribution in aluminium alloy single lap joint was investigated using elasti c-plastic finite element method(FEM).The results from the FEM analysis for stre ss distribution both in adhesive layer and adherend show that the influence of r ecessing is not evident on the stress distribution at the end of the over lap zo ne of the joint,but is great on the peak stress near the recessing.The higher th e elastic modulus of adhesive,the smaller the peak stress near the recessing.The influence of recessing in adhesive layer with high elastic modulus on the peak stress of joint is not evident so that it would improve the actual strength of j oint markedly based on the load bearing ability not being affected evidenly. On the other hand,the recessing in the joint with low elastic modulus adhesive caus es the peak stresses increase evidently that may decrease the nominal and actual strength of the joint markedly.The results from numerical simulation are in acc ordance roughly with the experimental data of the references.