The University of Southampton
University of Southampton Institutional Repository

Identification of heterogeneous constitutive parameters in a welded specimen: uniform stress and virtual fields methods for material property estimation

Identification of heterogeneous constitutive parameters in a welded specimen: uniform stress and virtual fields methods for material property estimation
Identification of heterogeneous constitutive parameters in a welded specimen: uniform stress and virtual fields methods for material property estimation
Local strain data obtained throughout the entire weld region encompassing both the weld nugget and heat affected zones (HAZs) are processed using two methodologies, uniform stress and virtual fields, to estimate specific heterogeneous material properties throughout the weld zone. Results indicate that (a) the heterogeneous stress–strain behavior obtained by using a relatively simple virtual fields model offers a theoretically sound approach for modeling stress–strain behavior in heterogeneous materials, (b) the local stress–strain results obtained using both a uniform stress assumption and a simplified uniaxial virtual fields model are in good agreement for strains ? xx?<?0.025, (c) the weld nugget region has a higher hardening coefficient, higher initial yield stress and a higher hardening exponent, consistent with the fact that the steel weld is overmatched and (d) for ? xx?>?0.025, strain localization occurs in the HAZ region of the specimen, resulting in necking and structural effects that complicate the extraction of local stress strain behavior using either of the relatively simple models.
material parameter identification, heterogeneous weld zone, virtual fields method, computer vision, digital image correlation
1741-2765
451-464
Sutton, M.A.
9683ede4-2649-4e2f-bdf1-cd746a0ecfc5
Yan, J.H.
d29ccdce-5ab1-4607-b1d2-dbb6848ac98d
Avril, S.
6c8490e9-2ae9-41c3-9bf8-bfbb3836c097
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Adeeb, S.M.
ab4eef3a-04a7-4ae6-83cf-0ee25049cd71
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Lo, Yu-Lung
97ef6446-ff06-46c3-9b64-700f1937462d
Sutton, M.A.
9683ede4-2649-4e2f-bdf1-cd746a0ecfc5
Yan, J.H.
d29ccdce-5ab1-4607-b1d2-dbb6848ac98d
Avril, S.
6c8490e9-2ae9-41c3-9bf8-bfbb3836c097
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Adeeb, S.M.
ab4eef3a-04a7-4ae6-83cf-0ee25049cd71
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Lo, Yu-Lung
97ef6446-ff06-46c3-9b64-700f1937462d

Sutton, M.A., Yan, J.H., Avril, S., Pierron, F. and Adeeb, S.M. , Pierron, F. and Lo, Yu-Lung (eds.) (2008) Identification of heterogeneous constitutive parameters in a welded specimen: uniform stress and virtual fields methods for material property estimation. [in special issue: Inverse Problems in Experimental Mechanic] Experimental Mechanics, 48 (4), 451-464. (doi:10.1007/s11340-008-9132-6).

Record type: Article

Abstract

Local strain data obtained throughout the entire weld region encompassing both the weld nugget and heat affected zones (HAZs) are processed using two methodologies, uniform stress and virtual fields, to estimate specific heterogeneous material properties throughout the weld zone. Results indicate that (a) the heterogeneous stress–strain behavior obtained by using a relatively simple virtual fields model offers a theoretically sound approach for modeling stress–strain behavior in heterogeneous materials, (b) the local stress–strain results obtained using both a uniform stress assumption and a simplified uniaxial virtual fields model are in good agreement for strains ? xx?<?0.025, (c) the weld nugget region has a higher hardening coefficient, higher initial yield stress and a higher hardening exponent, consistent with the fact that the steel weld is overmatched and (d) for ? xx?>?0.025, strain localization occurs in the HAZ region of the specimen, resulting in necking and structural effects that complicate the extraction of local stress strain behavior using either of the relatively simple models.

This record has no associated files available for download.

More information

e-pub ahead of print date: 6 June 2008
Published date: August 2008
Keywords: material parameter identification, heterogeneous weld zone, virtual fields method, computer vision, digital image correlation
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 210621
URI: http://eprints.soton.ac.uk/id/eprint/210621
ISSN: 1741-2765
PURE UUID: cf3124a7-3e3e-480c-8022-08053aec5a5c
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 14 Feb 2012 16:55
Last modified: 15 Mar 2024 03:35

Export record

Altmetrics

Contributors

Author: M.A. Sutton
Author: J.H. Yan
Author: S. Avril
Author: F. Pierron ORCID iD
Author: S.M. Adeeb
Editor: F. Pierron ORCID iD
Editor: Yu-Lung Lo

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×