Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data

Rouse, James Paul and Hyde, Christopher J. and Sun, W. and Hyde, T.H. (2013) Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data. Materials Science and Technology, 30 (1). pp. 54-62. ISSN 1743-2847

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Abstract

A procedure to estimate material constants for the unified Chaboche viscoplasticity model from experimental data has been published elsewhere; however several critical assumptions are made to enable this and potential numerical problems can limit the effectiveness of the optimisation. Pragmatic optimisation procedures are therefore required to determine the material properties accurately and efficiently. This is made more complex by the presence of several deformation mechanisms and their interactions. Automation is critical due to the large amounts of data generated in testing. Complications that inhibit this process can arise due to factors such as experimental scatter. In this paper, a general optimisation framework is discussed and investigated using data from isothermal tests on a P91 steel at 600°C. Potential obstacles in the procedure are addressed and solutions (such as pre-optimisation experimental data ‘cleaning’) are suggested. Methods to maximise the amount of confidence a user has in a particular optimised constant set are also discussed.

Item Type: Article
Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Materials Science and Technology on 06/12/2013, available online: http://www.tandfonline.com/10.1179/1743284713Y.0000000277
Keywords: Chaboche, Visco-plasticity model, Low cycle fatigue, Optimisation, P91
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: 10.1179/1743284713Y.0000000277
Depositing User: Eprints, Support
Date Deposited: 19 Sep 2017 07:59
Last Modified: 14 Oct 2017 08:25
URI: http://eprints.nottingham.ac.uk/id/eprint/46500

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