Modified Johnson-Cook model of aluminum alloy 6016-T6 sheets at low dynamic strain rates

The use of a dynamical constitutive model is essential for the numerical analysis of dynamic impact. In this study, uniaxial tension tests were conducted on aluminum alloy (AA) 6016-T6 sheets under different strain rates (0.001–100/s). The results show that the flow properties of AA 6016-T6 is slightly sensitive to strain rate. A modified Johnson-Cook (J-C) model based on the archetype of the J-C equation was developed by integrating the strain rate hardening coefficient with the strain rate. Compared to the original J-C model, the modified J-C model could describe the flow behavior of AA 6016-T6 under different strain rates with an acceptable prediction error of 0.0415%. Moreover, finite element simulations were performed by implementing the modified J-C model into Abaqus/Explicit through the VUMAT subroutine, resulting in a modified J-C equation could accurately predict the plastic deformation of AA 6016-T6.