ZL702A 铝合金混合硬化行为建模及其对切削仿真结果的影响

To accurately characterize the Bauschinger effect of ZL702A aluminum alloy during the cutting process, a novel mixed hardening model that integrates modified Johnson-Cook (J-C) constitutive model (isotropic hardening) with the Armstrong-Frederick (A-F) model (kinematic hardening) was proposed. The validity of the model was verified through uniaxial cyclic loading simulations by implementing VUHARD/ VUMAT subroutines on the ABAQUS platform. Boring experiments and boring simulations were conducted to compare the computational results of different constitutive models. The results show that cutting force simulation results of the isotropic hardening model are closer to actual experimental values than the mixed hardening model. The peak Mises stress of the mixed hardening model is lower than that of the isotropic hardening model. The mixed hardening model exhibits more uniform stress distribution within the shear zone. The mixed hardening model is failed to fully capture the strain hardening behavior of material, and exhibits premature initiation of failure evolution compared to the isotropic hardening model.