Analysis of stresses in double-lap

Adhesively bonded joints are frequently used in aircraft and aerospace structures. A bonding technique called overlamination, where the parts to be joined are connected by adherends that are laminated directly upon the assembly, is more common in the marine industry, and there is a need to evaluate the stress distribution in such joints. In the present paper, the interfacial stress distribution in double-lap joints is investigated. A new analytical model of the shear and normal stresses are derived by using the beam bending theory. This method does not require an assumption of stress distribution in the lap. Both the shear stress and the normal stress along the adhesion layer can be evaluated by the present theoretical method. It is shown that both the shear stress and the normal stress depend on the thickness of adhesion layer. Its validity is verified by using numerical results of FEM. It is shown that our solutions provide a better prediction than the original theoretical solutions. © 2013 The Japan Society of Mechanical Engineers.