Stress Analyses of Double Lap Joint by Boundary Element Method

The boundary element method (BEM) is applied to the stress analyses of two dimensional adhesive-bonded structure in elastic scope. Its advantages over finite element method for adhesive-bonded structure lie in less amount of calculating work and effectiveness of analyzing interracial stresses. In this paper the system of adhesive-bonded structure is derided into three subregions, for each of which boundary integral equations are established by using linear and quadratic isoparametric elements. The boundary integral equations for the system of adhesive-bonded structure are formulated on the basis of interracial conditions and the boundary integral equations for each subregion. It is also presented in this paper that the stresses inside adhesive layer can be worked out by the same subregion technique. The BEM technique for adhesive-bonded structure proves valid by comparing the stress distribution for double lap joint calculated in this paper with that calculated by finite element method.