Adhesive-bonded double-lap joints

TLDR

The analyses extend the elastic solution of Volkersen and cover adhesive plasticity, adherend stiffness imbalance, thermal mismatch, and emphasize the importance of peel‑stress failure for composite adherends. Explicit analytical solutions for the static load‑carrying capacity of double‑lap adhesive‑bonded joints are derived, and peel‑stress failures at the joint ends are examined. The solutions show that adhesive influence on maximum bond strength is uniquely determined by strain energy in shear per unit area, and the resulting explicit formulas are simple enough for design use.

Abstract

Explicit analytical solutions are derived for the static load carrying capacity of double-lap adhesive-bonded joints. The analyses extend the elastic solution Volkersen and cover adhesive plasticity, adherend stiffness imbalance and thermal mismatch between the adherends. Both elastic-plastic and bi-elastic adhesive representations lead to the explicit result that the influence of the adhesive on the maximum potential bond strength is defined uniquely by the strain energy in shear per unit area of bond. Failures induced by peel stresses at the ends of the joint are examined. This failure mode is particularly important for composite adherends. The explicit solutions are sufficiently simple to be used for design purposes