Experimental analysis and constitutive modeling for the newly developed 2139-T8 alloy

Mechanical behavior of recently emerged 2139-T8 aluminum alloy, which is based on an Al-Cu-Mg-Ag system, has been characterized by uniaxial compression and tension experiments over a wide range of strain rates from 10−4 to 104 s−1 and for temperatures from −60 to 300 °C. Driven by experimental results, modifications to widely used Johnson-Cook constitutive model has been proposed, and model parameters have been determined. It has been shown that modified Johnson-Cook (MJC) model satisfactorily captures rate- and temperature-dependent variations in flow stress through enhanced coupling between temperature and strain hardening as well as temperature and strain-rate sensitivity. The modified model also provides flow stress prediction over the entire range of quasi-static and dynamic regimes by a single continuous function.