Abstract:
In order to study the effect of service temperature on quasi-static failure of aluminum-carbon fiber reinforced polymer (CFRP) composite bonded joints, aluminum alloy-CFRP composite bonded joints were processed. Considering the service temperature under actual operating conditions of the vehicle, three ambient temperatures of low temperature (−40℃), normal temperature (20℃) and high temperature (80℃) were selected, and the loading rates were 1 mm/min and 100 mm/min in combination with the designed Arcan fixture. The quasi-static failure strength of aluminum alloy-CFRP composite butt joints (BJs), 45° scarph joints (45°SJs) and shear joints (TSJs) at different temperatures were obtained. Combined with the failure section to analyze the failure mode of the joint, the failure criterion equation and the three-dimensional response surface were established. The results show that the quasi-static failure strength of aluminum alloy-CFRP composite bonded joints at different loading rates show a significant downward trend in high temperature environment, and it shows a certain upward trend in low temperature environment. The failure mode in high temperature environment is the cohesive failure of adhesive layer, and the ratio of fiber tear increases in low temperature environment. Compared with the quasi-static failure strength at the loading rate of 1 mm/min, the quasi-static failure strength of the aluminum alloy-CFRP composite bonded joint under different temperature and stress conditions is obviously improved at the loading rate of 100 mm/min.