弹性模量对铝胶焊搭接接头应力分布的影响

Effect of Elastic Modulus of Adhesives on Stress Distribution in Weld-bonded Joints

运用利用弹塑性有限元方法,研究了胶粘剂弹性模量对铝合金胶焊搭接接头上工作应力分布的影响。研究结果表明:随着胶粘剂弹性模量的增加,胶焊搭接区焊点中心线上的应力分布趋于均匀,胶层-焊点边缘处的峰值应力降低,但靠近搭接区端部胶层中的各应力峰值增大;距胶层中心线0.15mm的面上与焊点中心相对应点的峰值应力随弹性模量提高而下降。为提高胶焊接头承载能力,建议采用弹性模量适中的胶粘剂。

The effect of the elastic modulus of adhesives on the stress distribution in aluminumalloy weld-bonded single lap joint under loading was investigated using the elastic-plastic finite element method （FEM）. The results showed that the stress distribution in the overlap zone was more uniform as the elastic modulus of the adhesive increased along the horizontal plane and the peak stresses occurred adjacent to the adhesive layer decreased evidently, but the peak stresses in mid-bondline near the free end of the lap zone was increased. At the plane 0.05 mm away from the mid-bondline, the peak stresses at the point corresponding to the center of the spot nugget at the joint decreased greatly when the elastic modulus increased.