Determination of material properties in the Chaboche unified viscoplasticity model

Gong, Y.P.; Hyde, Christopher J.; Sun, W.; Hyde, T.H.

Abstract

An experimental programme of cyclic mechanical testing of a 316 stainless steel, at temperatures up to 600°C, under isothermal conditions, for the identification of material constitutive constants, has been carried out using a thermo-mechanical fatigue (TMF) test machine with induction coil heating. The constitutive model adopted is a modified Chaboche unified viscoplasticity model, which can deal with both cyclic effects, such as combined isotropic and kinematic hardening, and rate-dependent effects, associated with viscoplasticity. The characterization of 316 stainless steel is presented and compared with results from cyclic isothermal tests. A least-squares optimization algorithm has been developed and implemented for determining the material constants in order to further improve the general fit of the model to experimental data, using the initially obtained material constants as the starting point in this optimization process. The model predictions using both the initial and optimized material constants are compared to experimental data.

• Journal Article Type: Article
• Acceptance Date: Aug 6, 2009
• Online Publication Date: Sep 11, 2009
• Publication Date: Jan 1, 2010
• Deposit Date: Sep 19, 2017
• Publicly Available Date: Sep 19, 2017
• Journal: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
• Print ISSN: 1464-4207
• Electronic ISSN: 2041-3076
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Volume: 224
• Issue: 1
• DOI: https://doi.org/10.1243/14644207JMDA273
• Keywords: Unified viscoplasticity model, 316 stainless steel, Material property determination, Non-linear least-squares optimization
• Public URL: https://nottingham-repository.worktribe.com/output/705788
• Publisher URL: https://doi.org/10.1243/14644207JMDA273