Failure Load Prediction of Structural Adhesive Joints Based on Local Yielding Criterion with Non-linear Material Behaviour

Abstract

In this study, a local yielding failure criterion has been introduced to estimate the static strength of structural single lap adhesive joints under tensile loading. The criterion is based on a simple 2D non-linear elastic-plastic finite element analysis implementing both material and geometrical non-linearity. According to this method, the magnitude of peeling and shear stresses along the adhesive layer are considered as a failure parameter. The criterion suggests that fracture occurs when the failure parameter across the adhesive interface plane reaches a critical value at the edges of adhesive bond-line. The trends of peeling and shear stress concentrations along the bond line of structural single lap joint were given to have an idea about the critical failure distance of adhesive interface planes. It is shown that the predictions based on the proposed criterion have good agreements with the similar studies comparing to the previous works in literature.

Keywords: Single Lap Joint, Failure Criterion, Finite Element Method, Bi-linear Material