Strength design of the thin walled butt joint bonded with adhesive resin between dissimilar adherends.

Abstract

The effects of the mechanical properties of adherend materials on the strength of adhesive joints were studied by applying a tensile and torsional load to the tubular butt joints of dissimilar adherends. The specimen materials used in the experiment were carbon steel, copper, brass, aluminium alloy for adherends and epoxy resin for adhesive. The strength of the cured adhesive joint under the tensile load was compared with that without curing to investigate the effect of the difference in the coefficient of thermal linear expansion on the strength of the adhesive joints. The strength of the cured joints was higher than that of the non-cured joints. This showed that there was no remarkable influence of the coefficient of thermal linear expansion on the joint strength. The effects of ratio of Young's modulus on the joint's strength under tensile load decreased when the difference in Young's modulus of adherends was larger. This decrease of the joint strength was discussed on the basis of the analytical stress distribution in the inter face between adhesive layer and the adherend.