Abstract: In order to provide reference and guidance for the application of bonded structure of aluminum alloy-basalt fiber reinforced polymer composite (BFRP) in the automobile industry, the aluminum alloy-BFRP bonded joints were made, and the quasi-static tensile and shear tests were conducted at the low speed loading rates of 1, 50, and 100mm/min. The aging days of 0, 5,10,15, and 20 at 80℃ was selected in combination with the temperature range in service of automobile. The quasi-static tensile and shear tests at loading rates of 1 and 100mm/min were performed for aged joints, and the quasi-static failure strength on different aging days was obtained. The failure mode of joints was studied by means of macroscopic and SEM analyses. The results show that the failure strength of aluminum alloy-BFRP bonded joints is affected by the loading rate and aging time. In the process of low speed loading, the failure strength at tensile stress and shear stress increases with the increases in loading rate. In the range of loading rate, the increase in failure strength at shear stress is larger than that at tensile stress. In the three low speed loading rate tests, the failure modes at tensile stress and shear stress are fiber tearing and adhesive layer cohesion, respectively. Low speed loading rate has no obvious effect on the macro failure mode of unaged joints. This study is of engineering significance for the quasi-static failure prediction of adhesive structures in high temperature service.

Key words: basalt fiber reinforced polymer composite; adhesive bonding; loading rate; high temperature; aging; failure prediction