Vol. 4, No. 2, 2009

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ISSN: 1559-3959
Fields of stored energy associated with localized necking of steel

André Chrysochoos, Bertrand Wattrisse, Jean-Michel Muracciole and Yves El Kaïm

Vol. 4 (2009), No. 2, 245–262
Abstract

This paper describes an experimental procedure for the simultaneous determination of heat sources and mechanical energy involved locally during a heterogeneous tensile test. This procedure involves two complementary imaging techniques: digital image correlation (DIC) and infrared thermography (IRT). The first technique gives displacement fields from which strains are derived while the second provides temperature fields with which the heat sources are estimated using a local form of the heat equation. Moreover, a method based on integration of equilibrium equations under the plane stress assumption is used to determine the stress distribution during the test. The distribution of the local deformation energy developed by the material is then assessed using stress and strain-rate fields.

Tensile tests were performed on thin flat steel samples. The results revealed early and gradual development of strain localization within the gauge part of the specimen. Energy balances were performed inside and outside the necking zone based on the assumption that the thermoelastic part of the behaviour remains linear and isotropic. Finally, indirect estimate of the stored energy led us to compute the time course of the local Taylor–Quinney coefficient.

Keywords
digitial image correlation, infrared thermography, dissipation, stored energy, plasticity, localization
Milestones
Received: 18 December 2007
Revised: 9 June 2008
Accepted: 19 June 2008
Published: 12 April 2009
Authors
André Chrysochoos
LMGC UM 5508 CNRS UMII, CC 081
Université Montpellier II
Place E. Bataillon
34095 Montpellier Cedex
France
Bertrand Wattrisse
LMGC UM 5508 CNRS UMII, CC 081
Université Montpellier II
Place E. Bataillon
34095 Montpellier Cedex
France
Jean-Michel Muracciole
LMGC UM 5508 CNRS UMII, CC 081
Université Montpellier II
Place E. Bataillon
34095 Montpellier Cedex
France
Yves El Kaïm
LMGC UM 5508 CNRS UMII, CC 081
Université Montpellier II
Place E. Bataillon
34095 Montpellier Cedex
France