Proposal of a Convenient and Accurate Method for Evaluation of Debonding Strength

Abstract

A debonding fracture criterion of single lap joints is discussed. Two distinct intensities of singular stress fields corresponding to two singular indexes are calculated accurately by the reciprocal work contour integral method. The results show the ratio of the intensities of two types of the singular stress fields is almost the same for the various adhesive geometries. Therefore the criterion can be expressed in terms of the intensity of singular stress field having the stronger singularity when aluminum alloy is bonded by epoxy resin. The proposed method can be applied to evaluating the bonding strength for various structures conveniently.