ABSTRACT
This study examines the bond behavior between carbon fiber-reinforced polymer (CFRP) and steel plates subjected to fatigue loading. Eight single-lap shear joints consisting of CFRP and steel were fabricated and experimentally evaluated. Influence of the load ratio on failure modes and bond-slip curves was analyzed. Results showed that cohesive failure was the dominant failure mode under all loading conditions. A decrease in the load ratio led to a reduction in adhesive residue on the steel surface. The bond-slip curves were approximately bilinear for load ratios ranging from 0.3 to 0.6 and trilinear for load ratios of 0.7 and 0.8. A unified bond-slip model was proposed, based on the regression of the experimental results, to characterize the key parameters of the bond-slip curves under varying loading conditions.
