Dynamic Mechanical Behavior and Numerical Simulation of 6013-T4 Aluminum Alloy at Different Temperatures and Strain Rates

Dynamic compression test of 6013-T4 aluminum alloy was conducted by split Hopkinson pressure bar apparatus at different temperatures (25, 200, 300℃) and strain rates (1 000, 2 000, 3 000, 4 000, 5 000 s^-1), and dynamic mechanical behavior under impact load was investigated. Numerical simulation of dynamic impact experiment was carried out by the fitted Johnson-Cook constitutive equation. The results show that 6013-T4 aluminum alloy had significant strain rate and strain hardening effect, and the dynamic flow stress decreased with increase of deformation temperature. The yield strength at room temperature was insensitivity to strain rate. As deformation temperature increased, the strain rate sensitivity of yield strength gradually increased. Based on the quasi-static at room temperature and dynamic true stress-true strain curves at different temperatures and strain rates, Johnson-Cook constitutive equation of the alloy was determined. The simulated results of true stress-true strain curves at different temperatures and strain rates were consistence with the experimental and constitutive results.