Plastic deformation of 2024-T351 aluminum plate over a wide range of loading conditions

Abstract

Plastic deformation of 2024-T351 aluminum plate is studied under multiple load conditions. Uniaxial tension and compression, and pure shear (torsion) tests have been conducted over a wide range of strain rates (10−4–104s−1) and temperatures (−50 to 450°C). The results show no strain rate effect on plastic deformation up to strain rates of about 5000s−1. Strain rate effect is observed in compression tests at strain rates above 5000s−1. Tests at various temperatures show decrease in stress with increasing temperature. No strain hardening is observed at temperatures of 300°C and 450°C. Effective stress vs. equivalent strain curves generated from tension, compression and shear tests do not coincide indicating a discrepancy with the prediction of J2 flow theory based plasticity models. Experimental results from tension and compression tests on specimens machined in different orientations relative to the plate rolling direction show that the 2024-T351 plate has anisotropic properties with regard to plasticity. The experimental data can be used for the evaluation and development of constitutive models for plasticity. Here, the experimental data is used for determining the parameters and examining the validity of the plasticity model of Johnson and Cook (1983) and the anisotropic yield function of Barlat et al. (1991).