Abstract: In this paper, an interference fit finite element model of carbon fiber shaft tube and metal shaft head were established to simulate respectively the assembly and torsion process of the interference fit joint. The variation of joint stress and contact surface stress during the assembly and torsion process of carbon fiber shaft tube and metal shaft head were studied, and the failure of metal shaft head and carbon fiber shaft tube were judged. The maximum assembly force and the simulated failure torque were calculated by the output shaft tube and the shaft head interference contact surface stress value CPRESS. Finally, it is found that the interference assembly and torsion experiments were in close agreement with the result from finite element analysis. The results show that the maximum structure stress of the joint after the assembly process occurred in the innermost fiber layer and the maximum structure stress of the joint during the torsion process occurred in the angular position of the stepped surface.

Key words: interferencefit, contact surface stress value, interference assembly, failure torque