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.