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High strain rate elasto-plasticity identification using the Image-Based Inertial Impact (IBII) test part 1: Error quantification

High strain rate elasto-plasticity identification using the Image-Based Inertial Impact (IBII) test part 1: Error quantification
High strain rate elasto-plasticity identification using the Image-Based Inertial Impact (IBII) test part 1: Error quantification
Current high strain rate testing procedures generally rely on the split Hopkinson bar (SHB). In order to gain accurate material data with this technique it is necessary to assume the test sample is in a state of quasi-static equilibrium so that inertial effects can be neglected. During the early portion of an SHB test it is difficult to satisfy this assumption making it challenging to investigate the elastic-plastic transition for metals. With the development of ultra-high speed imaging technology the image-based inertial impact (IBII) test has emerged as an alternative to the SHB. This technique uses full-field measurements coupled with the virtual fields method to identify material properties without requiring the assumption of quasi-static equilibrium. The purpose of this work is to develop the IBII method for the identification of elastoplasticity in metals. In this paper (part 1) the focus is on using synthetic image deformation simulations to analyse identification errors for two plasticity models, a simple linear hardening model and a modified Voce model. Additionally, two types of virtual fields are investigated, a simple rigid body virtual field and the recently developed sensitivity-based virtual fields. The results of these simulations are then used to select optimal processing parameters for the experimental data analysed in part 2.
1475-1305
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Davis, Frances M
20f89066-bbac-42dc-908d-d89a747dc399
Dreuilhe, Sarah Marie
9f97edf5-6f14-4668-8c1f-7ceb88734542
Marek, Aleksander
6d758ff6-6423-462d-88e9-d44e71df4c3d
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Davis, Frances M
20f89066-bbac-42dc-908d-d89a747dc399
Dreuilhe, Sarah Marie
9f97edf5-6f14-4668-8c1f-7ceb88734542
Marek, Aleksander
6d758ff6-6423-462d-88e9-d44e71df4c3d
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Fletcher, Lloyd, Davis, Frances M, Dreuilhe, Sarah Marie, Marek, Aleksander and Pierron, Fabrice (2020) High strain rate elasto-plasticity identification using the Image-Based Inertial Impact (IBII) test part 1: Error quantification. Strain. (In Press)

Record type: Article

Abstract

Current high strain rate testing procedures generally rely on the split Hopkinson bar (SHB). In order to gain accurate material data with this technique it is necessary to assume the test sample is in a state of quasi-static equilibrium so that inertial effects can be neglected. During the early portion of an SHB test it is difficult to satisfy this assumption making it challenging to investigate the elastic-plastic transition for metals. With the development of ultra-high speed imaging technology the image-based inertial impact (IBII) test has emerged as an alternative to the SHB. This technique uses full-field measurements coupled with the virtual fields method to identify material properties without requiring the assumption of quasi-static equilibrium. The purpose of this work is to develop the IBII method for the identification of elastoplasticity in metals. In this paper (part 1) the focus is on using synthetic image deformation simulations to analyse identification errors for two plasticity models, a simple linear hardening model and a modified Voce model. Additionally, two types of virtual fields are investigated, a simple rigid body virtual field and the recently developed sensitivity-based virtual fields. The results of these simulations are then used to select optimal processing parameters for the experimental data analysed in part 2.

Text
Fletcheretal_2020_ElastoPlasIBII_Part1 - Accepted Manuscript
Restricted to Repository staff only until 21 December 2021.
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Accepted/In Press date: 21 December 2020

Identifiers

Local EPrints ID: 446212
URI: http://eprints.soton.ac.uk/id/eprint/446212
ISSN: 1475-1305
PURE UUID: 23c6801b-3953-415e-8eb2-04731af31e3b
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994

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Date deposited: 28 Jan 2021 17:32
Last modified: 18 Feb 2021 17:14

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Contributors

Author: Lloyd Fletcher
Author: Frances M Davis
Author: Sarah Marie Dreuilhe
Author: Aleksander Marek
Author: Fabrice Pierron ORCID iD

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