Abstract: A two-dimensional equation of peeling stress distribution for the single-L peel adhesive joints is established, which consists of carbon fiber reinforced plastic/polymer (CFRP) and Aluminum alloy (Al), under tension, according to balance equations. The substrate bending stiffness coefficient is regarded as an important parameter in this equation to describe the peeling stress distribution, when backing and substrate both are rigid material. The curve is a damping harmonic function, whose period and peak values are decided by the nature of the adhesive, the mechanical properties and geometries of the single-L peel adhesive joint. The correctness of the equation is verified by the peel test and finite element analysis, and analyzing the discrepancy among them. Numerically, the influence of peeling stress distribution by altering the substrate thickness is investigated, and compared to the finite element analysis. It is found that along with the thickness of CFRP increasing, the peak value of peeling stress has decreased.

Key words: Adhesive joints, Carbon fiber reinforled plastic/polymer, Finite element method, Peeling, plastics, Stress analysis