Nonlinear Semianalytical Prediction of Debonding at the FRP-Generic Material Interface with Mechanical End Anchorages

The full-range debonding process of a fiber-reinforced polymer (FRP)-generic material substrate interface with mechanical end anchorages requires a better understanding. In this study, we developed a nonlinear semianalytical model based on a cohesive crack model to predict the full-range debonding process of such an interface in a single-shear mode, considering the relatively deformed region in the interface as a cohesive zone. Specifically, we produced a double exponential bond-slip constitutive model with residual bonding shear stress and boundary conditions of slip constraints at both anchoring ends. Implicit solutions for the relative slips, bonding shear stresses, and axial forces in the FRP along the bond length, as well as the load-slip responses at the loading end and effective bond length, were obtained using the Chebyshev polynomial approximation strategy. The accuracy of the proposed model was verified using experimental results available in the literature. Then, the evolution of full-range interfacial bonding behavior and load-slip responses for different bond lengths was discussed. Finally, a parametric study highlighting the effect of geometry and material properties on the load-slip response at the loading end was presented.