Interfacial Stress Analysis of Adhesively Bonded Lap Joint

Abstract

The use of adhesively bonded joints in place of traditional joining techniques such as bolted or rivet joints is becoming greatly popular in recent years. Interfacial stress in the adhesive is critical to the strength of adhesively bonded joints. It is necessary to predict the interfacial stresses accurately to ensure the safety of joints. In this work, an analytical model is explicitly presented to evaluate the stresses in a double lap joint. The equilibrium equations in the adhesive overlap region are derived on the basis of elasticity theory. The governing equations are presented in terms of shear and peel stresses in the adhesive. Analytical solutions are derived for the shear and peel stresses, which are considered to be the main reason for the failure of the double lap joint. To verify the analytical solutions, the finite element method is conducted using the commercial package ANSYS. Results from the analytical solution agree well with finite element results and numerical investigations available in the literature. The effect of the adhesive thickness, shear modulus, adherend Young’s modulus and bonding length on the shear and peel stresses in the adhesive of the double lap joint are studied. Numerical results demonstrate that both the maximum shear and peel stress occur at both ends of the bonding region. The maximum values of the shear and peel stresses increase as the adhesive thickness decreases and as the adhesive shear modulus increases provided that the adhesive thickness is sufficiently small. The simplicity and capability to obtain analytical expressions of the shear and peel stresses for double lap adhesive bonded joints makes the proposed analytical model applicable for the stress analysis and preliminary structural design.

Mechanical Characterization of Core-Shell Rubber/Epoxy Polymers for Automotive Structural Adhesives as a Function of Operating Temperature

“…Since the SLJ specimen was asymmetrical with respect to the axis of force action, the tensile stress and bending moment acted on the SLJ specimen [ 49 ]; as a result, the shear and peel stresses acted on the adhesive, as shown in Figure 10 . Moreover, since the applied adhesive had a finite length and had both end tips, the stresses acting on the adhesive were maximized at the tips [ 50 , 51 , 52 ]. These stresses caused deformation of the adhesive and, in the case of the SLJ test, it was possible to qualitatively examine the deformation resistance characteristics of the adhesive by observing the appearance of the specimen after the test.…”

Evaluation of Bonding Gap Control Methods for an Epoxy Adhesive Joint of Carbon Fiber Tubes and Aluminum Alloy Inserts

“…This probably means that the interfacial stresses were very high locally, thus causing a failure. Future designs (to optimize the structure) should probably focus on developing a double lap joint and pay more attention to interfacial shear stress analysis as carried out in [ 35 ].…”

Efeito Da Espessura Do Adesivo No Comportamento Mecânico De Juntas Adesivas Para Aplicação Automotiva

“…Schijve et al [13] constataram que o aumento da espessura do adesivo em chapas de alumínio da liga 2024-T3 proporcionavam um melhor comportamento à fadiga. Segundo Her [14], quanto mais fina for a camada adesiva, maior será a tensão cisalhante. Li et al [15] mostraram a distribuição da tensão de descascamento para diferentes espessuras de adesivo, onde menores espessuras adesivas conduziram a maiores tensões.…”