胶粘剂弹性模量对铝合金单搭接接头应力应变分布的影响

利用弹塑性有限元法研究胶粘剂的弹性模量对单搭接接头应力应变分布的影响.结果表明,随着弹性模量的增加,接头的应力峰值逐渐增大,并由胶层向胶瘤转移,其刚度越大,应变越小.低弹性模量胶粘剂的接头,载荷主要由胶层承担,胶层受力很均匀,而胶瘤的作用很小,胶瘤并没有很大地降低胶层中的应力峰值.高弹性模量胶粘剂的接头,胶瘤的作用很大,承担了很大一部分载荷,而胶层中部受力很不均匀.

Influence of Elastic Modulus of Adhesive on the Stress and Strain Distribution in Aluminium Single Lap Joint

The elasto-plastic finite element method(FEM) was used to investigate the effect of the elastic modulus of adhesive on the stress and strain distribution in adhesively bonded aluminium single lap joint.The results from the numerical simulation showed that the value of peak stress became higher as the elastic modulus of adhesive increased and the peak stress transferred from the adhesive layer to the fillet.It was also shown that the larger the stiffness,the smaller the strain.For the aluminium single lap joint bonded with low elastic modulus adhesive,the load was mainly undertaken by the adhesive layer and the stress distributed more uniformly in it and a little load born by the fillet.In other words,the adhesive fillets didn't play the pole of decrease the peak stress of adhesive layer evidently.For the aluminium single lap joint bonded with high elastic modulus adhesive,the function of adhesive fillets was very large so that a lot of load was undertaken by it but the stress and strain distributed in the middle layer of the adhesive was not uniformly as that in the one bonded with low elastic modulus adhesive.