Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data
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 opti...
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Taylor & Francis
2013
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| Online Access: | https://eprints.nottingham.ac.uk/46500/ |
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| author | Rouse, James Paul Hyde, Christopher J. Sun, W. Hyde, T.H. |
| author_facet | Rouse, James Paul Hyde, Christopher J. Sun, W. Hyde, T.H. |
| author_sort | Rouse, James Paul |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T20:02:20Z |
| format | Article |
| id | nottingham-46500 |
| institution | University of Nottingham Malaysia Campus |
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| last_indexed | 2025-11-14T20:02:20Z |
| publishDate | 2013 |
| publisher | Taylor & Francis |
| recordtype | eprints |
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| spelling | nottingham-465002020-05-04T16:40:44Z https://eprints.nottingham.ac.uk/46500/ Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data Rouse, James Paul Hyde, Christopher J. Sun, W. Hyde, T.H. 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. Taylor & Francis 2013-12-06 Article NonPeerReviewed Rouse, James Paul, Hyde, Christopher J., 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 Chaboche Visco-plasticity model Low cycle fatigue Optimisation P91 https://doi.org/10.1179/1743284713Y.0000000277 doi:10.1179/1743284713Y.0000000277 doi:10.1179/1743284713Y.0000000277 |
| spellingShingle | Chaboche Visco-plasticity model Low cycle fatigue Optimisation P91 Rouse, James Paul Hyde, Christopher J. Sun, W. Hyde, T.H. Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| title | Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| title_full | Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| title_fullStr | Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| title_full_unstemmed | Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| title_short | Pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| title_sort | pragmatic optimisation methods for determining material constants of viscoplasticity model from isothermal experimental data |
| topic | Chaboche Visco-plasticity model Low cycle fatigue Optimisation P91 |
| url | https://eprints.nottingham.ac.uk/46500/ https://eprints.nottingham.ac.uk/46500/ https://eprints.nottingham.ac.uk/46500/ |