Stress analysis on a non-flat zigzag interface bonded joint

Abstract

ABSTRACT This article aims to explain the wide range of joint strengths observed depending on the nature of substrate surface geometry by linking the stress distributions in the adhesive layer to the overall strength of the adhesively bonded single lap joints (SLJs). The key factors to which the adhesion strength of non-flat interfaces is attributed are investigated numerically and experimentally. In an attempt to clarify the effect of mechanical interlock on overall adhesion strength of the adhesive joint, zigzag patterns were fabricated on the bonding surfaces of aluminum substrates. It was found that the local compressive and tensile stresses in the vicinity of the interface are the major cause of the practical enhancement or reduction of the joint strength. A comparison between the experimental results of optimum non-flat and standard SLJs showed a strength improvement of up to 40% compared to the conventional SLJ. According to the results of parametric studies, higher wave heights, lower wavelengths, and thinner bond lines improved the efficiency of the method.