Determination of constitutive behaviour of as cast AA 5182 for deformations that occur during direct chill casting using the Gleebe 1500 machine

Abstract

Compression, tension and cyclical compression-tension tests were done using the Gleeble 1500 thermomechanical simulator to measure the constitutive behaviour in an as cast AA 5182 aluminum allow. The temperatures (250-500°C) and strain rates (1·0 × 10^-5 − 1·0 s^-1) used for the tests were chosen to represent typical conditions experienced in the solid phase during DC casting due to thermally induced deformations that occur during cooling. Using the measurement results, a constitutive relationship using Garafolo's hyperbolic sine relationship was developed and tabular data relating stress to strain at various strain rates and temperatures was generated. The experiements done on the Gleebe 1500 machine were simulated using the commercial finite element code ABAQUS. Various methods within ABAQUS were used to simulate numerically the inelastic deformation behaviour of the material during deformation and included a hyperbolic sine creep law, plasticity without rate dependence, and viscoplasticity using tabular data. the results predicted by teh models developed within ABAQUS were then verified by comparing the predicted results with measurements made using the Gleebe 1500 thermomechanical simulator under different temperature and strain rate conditions from those used originally to develop the constitutive relationships.