Investigation on failure behavior of carbon fiber reinforced polymer wire subjected to combined tension and bending

Abstract

This study investigated the mechanical behavior of carbon fiber reinforced polymer (CFRP) wires subjected to combined tension and bending through transverse load tests and finite element analysis (FEA). The properties of the CFRP wires were examined through axial tensile and three-point bending tests. Transverse static load tests were conducted on CFRP wires under pretension ratios ranging from 0.00 to 0.85 to investigate the failure responses of the wires. FEA models considering the Hashin failure criteria were developed to reveal the stress state and failure mechanisms of CFRP wires under combined loads. Four failure stages were observed in the three-point bending tests on CFRP wires. The failure of the wires subjected to combined tension and bending loads was caused by fiber tensile fracture at the loading position. With increasing pretension ratio, the longitudinal ultimate load and energy absorption capacity of the CFRP wires increased, while the transverse ultimate load and deflection at fracture decreased. Additionally, an interaction equation at the ultimate state based on internal forces was established for CFRP wires under combined tension and bending.