几何尺寸对胶接接头强度影响的有限元模拟

采用三维弹塑性有限元模拟的方法,研究了几何尺寸对铝胶接接头强度的影响。结果表明:随着胶层厚度的增加,胶接强度先增大后减小;在一定范围内随着搭接长度的增大而增大,呈非线性关系;与搭接面积呈线性关系,在搭接面积相同的情况下,可以通过增加搭接宽度减小搭接长度来增大接头强度;另外,胶结强度随夹具之间的距离变短而降低,随被粘物厚度的增大而增大。厚度达到一定程度,这种趋势变化趋于缓慢。

Finite Element Modeling of Effect of Geometry on Adhesive Joints Strength

The effect of geometry on strength in aluminum adhesive joints is studied by using 3D elastic plastic
finite element method(FEM). The results show that:with adhesive thickness increasing,the strength first increases and
then decreases; the strength, which is not linear with the lap length but linear with the lap area,increases with the increasing of the lap length within a certain range. The strength can be increased with increasing lap width and decreasing lap length in the case of the same lap area. The strength decreases with the shorter distance between the clamps,
increases with the increasing of the adherend thickness,but the increase is not unlimited . This change tends to be slowl. When thickness reaches up to a certain extent.