The Application of Non-Linear Optimisation Algorithm to the Simulation of Nimonic Alloy 75 at Elevated Temperature

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.

• Periodical: Advanced Materials Research (Volumes 1061-1062)
• Pages: 39-44
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1061-1062.39
• Online since: December 2014
• Authors: Qing Lin Zeng, Zhi Lan Zhan*
• Keywords: Nickel-Chromium Alloy, Optimisation Algorithm, Parameter Determination, Unified Constitutive Model

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