搭接长度对胶接接头工作应力分布影响的数值分析

运用弹塑性有限元法对单搭接金属胶接接头承载后的应力分布特征进行分析，重点研究搭接长度对分别采用酚醛树脂和丙烯酸酯制备的接头应力分布和接头强度的影响。结果表明，胶粘剂的性能对应力分布有较大影响，酚醛树脂胶粘剂制备的接头中胶瘤承担了相当多的载荷，且随搭接长度的增加,von Mises等效应力峰值和剪切应力峰值均趋于向胶层内转移，胶层中各部位的应力亦均有下降；当采用丙烯酸酯胶制备的接头时，胶瘤承载作用并不明显，其应力峰值出现在胶层中被粘物拐角处。

NUMERICAL ANALYSIS OF THE EFFECT OF LAP LENGTH ON THE STRESS DISTRIBUTION OF ADHESIVELY BONDED JOINTS

The stress distribution of adhesively-bonded metal/metal single lap joints under tensile shear loading is analysed using elastic-plastic finite element method (FEM). The influence of lap length on the strength of adhesively bonded metal joints which are bonded with phenolic resin and acrylic resin respectively is discussed in detail. It is shown that adhesive has great influence on the stress distribution of the lap region. In the joints bonded with phenolic resin, there exists a higher stress in the fillet .With the increment of lap length, the position of the peak values of von Mises equivalent stress and shear stress moves from the fillet to the adhesive layer and the stress of adhesive layer decreases. In the joints bonded with acrylic resin, the stress of the fillet is lower and the peak value exists at the end of the adherend in the lap region.