Experimental and theoretical stress analysis for an interface stress model of single-L adhesive joints between CFRP and aluminum components

This paper presents a two-dimension analytical model of peeling stress distribution for the single-L peel adhesive joints consisting of carbon-fiber-reinforced plastic (CFRP) and aluminum alloy under the tensile loading environment. The advanced balance equation is established considering the substrate bending stiffness coefficient to describe the peeling stress distribution when backing and substrate are both relatively stiff materials. The specific boundary conditions for the peel test of single-L adhesive joints are also integrated. The curve of peeling stress distribution is a damping harmonic function whose period and peak values are decided by the nature of the adhesive, the mechanical properties, and the geometries of the single-L peel adhesive joint. The effectiveness of the analytical model is verified by comparing with the results obtained from peel test and finite element analysis. Numerically, the influence on the peeling stress distribution due to the different configurations of substrate thickness and clamping length is also investigated.