Abstract
In this paper, a gradient-driven non-linear optimization algorithm has been introduced and applied in numerically simulation of a nickel-chromium alloy at elevated temperature. The Chaboche unified constitutive model has been used to describe the cyclic plasticity and viscoplasticity of this alloy. Optimisation algorithm has facilitated a step-by-step method to obtain the initial material parameters, while a non-linear least-square approach were used to obtain the optimised material parameters. Uniaxial experiments were carried to obtain the full cyclic stress-strain and stress relaxation data at 450°C. Satisfactory results have been obtained for the simulation of the transient and steady state cyclic stress-strain and stress relaxation behaviour.
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