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

Abstract

In the present study, the stress-strain relationship of 6063-T5 aluminum alloy over wide ranges of temperatures and strain rates was investigated. Firstly, the quasi-static tensile tests and high temperature split Hopkinson pressure bar (SHPB) tests were carried out for 6063-T5 aluminum alloy. In the tests, the experimental temperature ranged from room temperature to 350℃, and the dynamic strain rate was 500/s-6000/s. Secondly, the effects of temperature and strain rate on mechanical properties of materials were discussed. The results showed that 6063-T5 aluminum alloy had obvious temperature softening effect and strain rate hardening effect, but strain rate softening effect may also occur under certain temperature conditions. Thirdly, the fracture morphology of tensile specimen and the metallographic structure of dynamic compression specimen under different temperature and strain rates were analyzed. Finally, by improving the fitting method and constitutive model, the modified Johnson-Cook constitutive model for 6063-T5 aluminum alloy was obtained. Compared with the traditional one, the modified Johnson-Cook constitutive model can predict the mechanical behavior of 6063-T5 aluminum alloy more accurately under high temperature and dynamic conditions.

Improved Analytical Model for Thermal Softening in Aluminum Alloys Form Room Temperature to Solidus

“…Phenomenological constitutive models are constitutive models established through empirical and semi-empirical equations based on experimental data and process parameters. Widely used empirical models include the Johnson-Cook model [8] and the Sellars-Tegart model [9]. Although the aforementioned models have been established, there is still a lack of practical and accurate models to describe the softening behavior of metals with temperature.…”

“…The modified J-C model has a reduced absolute error and provides a more accurate description of the constitutive of 6061 aluminum alloy. Wang et al [8] took the temperature rise into consideration, which was caused by the conversion of impact compression work into thermal energy and incorporated the temperature rise into the J-C model to correct its temperature term. Compared to the traditional J-C model, the modified model can more accurately predict the mechanical effects of 6063-T5 aluminum alloy under high-temperature dynamic conditions.…”