Abstract: In order to provide reference and guidance for the practical application of steel-aluminum adhesive structure to vehicle, three kinds of joints with different stress states are selected, i.e. thick base shear joint, 45° scarf joint and butt joint, for test under 5 different temperatures of -40,-10,25,50 and 80℃, to study the effects of temperature on the failure load, failure mode and failure criterion of plexus MA832 steel-aluminum adhesive joints. The results show that with the increase of temperature, the failure strength of three different joints all show a downward trend of cubic polynomial curve, but the descending amplitude is related to the stress state of the joints. Among them, the failure strength of thick base shear joint falls the most obviously, when temperature rises from 25 to 80℃ its failure strength drops by about 56%, but the rise of temperature does not change the failure mode of adhesive joints, which is characterized by cohesive failure. In addition, through the fitting of adhesive layer stress curve, the quadratic stress failure criterion of Plexus MA832 adhesive layer at different temperatures is established, and based on which the failure criterion expression of steel-aluminum adhesive joints at any temperature is given in the end

Key words: steel-aluminum adhesion, joint failure, temperature, failure prediction, failure criteria