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Comparison of Constitutive Laws on the Modeling of Thermo-Viscoplastic Behaviour of an Aluminum Alloy

The accuracy of simulation result depends greatly on the implemented hardening law. An appropriate hardening model should be able to describe the coupling effects of the strain, strain rate and temperature on the flow stress of the material. Based on the stress-strain curves obtained from uniaxial tensile tests, two different types of hardening models (power law and saturation) are proposed to describe the flow stresses of an aluminum alloy AA5086 under different temperatures (20, 150 and 200°C) and tensile speeds (1, 10 and 100 mm·s-1). The correlation results are compared to experimental data and the roles of the hardening models in predicting the material flow stress are compared and discussed.