Mechanical Properties and Constitutive Modeling of 6063-T5 Aluminum Alloy Over a Wide Range of Strain Rates and Temperatures

In this study, the stress-strain relationship of 6063-T5 aluminum alloy over a wide range of temperatures and strain rates was investigated. First, quasi-static tensile tests and high temperature split Hopkinson pressure bar (SHPB) tests were carried out for 6063-T5 aluminum alloy, where, the experimental temperature ranged from room temperature to 350 & DEG;C, and the dynamic strain rate was 500 s(-1)-6000 s(-1). Second, the effects of temperature and strain rate on the mechanical properties of the materials were discussed. The results showed that the 6063-T5 aluminum alloy exhibited clear temperature softening and strain rate hardening effects, but the strain rate softening effect could also occur under certain temperature conditions. Third, the fracture morphology of the tensile specimen and the metallographic structure of the dynamic compression specimen under different temperatures and strain rates were analyzed. Finally, by improving the fitting method and constitutive model, the modified Johnson-Cook constitutive model for the 6063-T5 aluminum alloy was obtained. Compared to the traditional model, the modified Johnson-Cook constitutive model could predict the mechanical behavior of the 6063-T5 aluminum alloy accurately under high temperature and dynamic conditions.

Automated summary

The stress-strain relationship of 6063-T5 aluminum alloy was investigated at different temperatures and strain rates. Quasi-static tensile tests and high temperature split Hopkinson pressure bar (SHPB) tests were conducted, and the effects of temperature and strain rate on the mechanical properties of the alloy were discussed. It was found that the alloy exhibited temperature softening and strain rate hardening effects, with strain rate softening effects occurring under certain temperature conditions. Fracture morphology and metallographic structure analysis were carried out, and a modified Johnson-Cook constitutive model was obtained to accurately predict the mechanical behavior of the alloy under high temperature and dynamic conditions.