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Auto-tuning of isotropic hardening constitutive models on real steel buckling data with finite element based multistart global optimisation on parallel computers

Auto-tuning of isotropic hardening constitutive models on real steel buckling data with finite element based multistart global optimisation on parallel computers
Auto-tuning of isotropic hardening constitutive models on real steel buckling data with finite element based multistart global optimisation on parallel computers
An automatic framework for tuning plastic constitutive models is proposed. It is based on multistart global optimisation method, where the objective function is provided by the results of multiple elasto-plastic finite element analyses, executed concurrently. Wrapper scripts were developed for fully automatic pre-processing, including model and mesh generation, analysis and post-processing. The framework is applied to an isotropic power hardening plasticity using real load/displacement data from multiple steel buckling tests. M. J. D. Powell's BOBYQA constrained optimisation package was used for local optimisation. It is shown that using the real data presents multiple problems to the optimisation process because (1) the objective function can be discontinuous, yet (2) relatively at around multiple local minima, with (3) similar values of the objective function for different local minima. As a consequence the estimate of the global minimum is sensitive to the amount of experimental data and experimental noise. The framework includes the verification step, where the estimate of the global minimum is verified on a different geometry and loading. A tensile test was used for verification in this work. The speed of the method critically depends on the ability to effectively parallelise the finite element solver. Three levels of parallelisation were exploited in this work. The ultimate limitation was the availability of the finite element commercial solver license tokens.
Kashani, Mohammad
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Shterenlikht, Anton
ea2cdbf5-3d8f-4aff-877e-a821cb5d4d0e
Alexander, Nicholas
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Williams, Gethin
dae51051-d05f-4571-bb97-1d6d759595db
Crewe, Adam J
89d119a7-3a3e-489c-8330-cfaf55ac8857
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Shterenlikht, Anton
ea2cdbf5-3d8f-4aff-877e-a821cb5d4d0e
Alexander, Nicholas
1427c28c-d5ed-4b3f-a40d-6a4c6be67c6b
Williams, Gethin
dae51051-d05f-4571-bb97-1d6d759595db
Crewe, Adam J
89d119a7-3a3e-489c-8330-cfaf55ac8857

Kashani, Mohammad, Shterenlikht, Anton, Alexander, Nicholas, Williams, Gethin and Crewe, Adam J (2017) Auto-tuning of isotropic hardening constitutive models on real steel buckling data with finite element based multistart global optimisation on parallel computers. Modelling and Simulation in Engineering, 2017, [6132106]. (doi:10.1155/2017/6132106).

Record type: Article

Abstract

An automatic framework for tuning plastic constitutive models is proposed. It is based on multistart global optimisation method, where the objective function is provided by the results of multiple elasto-plastic finite element analyses, executed concurrently. Wrapper scripts were developed for fully automatic pre-processing, including model and mesh generation, analysis and post-processing. The framework is applied to an isotropic power hardening plasticity using real load/displacement data from multiple steel buckling tests. M. J. D. Powell's BOBYQA constrained optimisation package was used for local optimisation. It is shown that using the real data presents multiple problems to the optimisation process because (1) the objective function can be discontinuous, yet (2) relatively at around multiple local minima, with (3) similar values of the objective function for different local minima. As a consequence the estimate of the global minimum is sensitive to the amount of experimental data and experimental noise. The framework includes the verification step, where the estimate of the global minimum is verified on a different geometry and loading. A tensile test was used for verification in this work. The speed of the method critically depends on the ability to effectively parallelise the finite element solver. Three levels of parallelisation were exploited in this work. The ultimate limitation was the availability of the finite element commercial solver license tokens.

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More information

Accepted/In Press date: 1 December 2016
Published date: 16 January 2017
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 406365
URI: http://eprints.soton.ac.uk/id/eprint/406365
PURE UUID: c33b6c26-c8aa-47bd-a355-bb0328c01566
ORCID for Mohammad Kashani: ORCID iD orcid.org/0000-0003-0008-0007

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Date deposited: 10 Mar 2017 10:45
Last modified: 16 Mar 2024 04:29

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Contributors

Author: Anton Shterenlikht
Author: Nicholas Alexander
Author: Gethin Williams
Author: Adam J Crewe

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