Abstract：CFRP was made by vacuum assisted resin infusion (VARI) and CFRP/Steel single-lap shear
joints were manufactured by bonding steel plate and CFRP together with epoxy resin. Specimens were
tested under four temperatures (-25, 0, 50, 100℃) with the same loading rate (0.625 m/s) by means
of a servo-hydraulic high rate testing system. The experimental results show that the mechanical
properties of joints are sensitive to temperature. In a certain range, the bond strength and
interfacial fracture energy of joints increase between -25℃ and 50℃. When the temperature
exceeds the glass transition temperature of the adhesive, bond strength and interfacial fracture
energy decrease significantly. The failure modes of specimens are different at different
temperatures. At the low temperatures (-25℃ and 0℃), the failure mode of joints is
adhesive/steel interface failure. At 50℃, the failure mode changes to mixed failure. When the
temperature reaches 100℃, the failure mode is adhesive/CFRP interface failure. Moreover, the FRP
strain field distribution in the overlapping area at different temperatures was analyzed by
digital image correlation (DIC) technique. The results show that strain of FRP at the edge is
lager than that at the center, and final failure initiates at the edge of the specimen.
