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Full-field evaluation of the onset of microplasticity in a steel specimen

Full-field evaluation of the onset of microplasticity in a steel specimen
Full-field evaluation of the onset of microplasticity in a steel specimen
This work deals with the study of the local onset of microplasticity in a steel specimen under tensile test through the use of a full-field strain measurement method at the micrometric scale. The kinematic measurements were performed by the so called grid method. In order to produce the gratings, direct interferential photolithography was used. The gratings were digitized through the use of a white-light interferometric microscope. An adapted image stitching algorithm, applied to the phase maps, has been developed and implemented in order to extend the size of the region of interest. With this method, and by paying a particular attention to the conduct of the mechanical tests, the strain resolution obtained ranges from 1 to 2 × 10?3 for a spatial resolution of about 20 ?m. In this paper, the method was applied to the study of the onset of local elasto-plastic strains in a ferritic steel coupon. The results show that the method is well suited to study small localized strains, for which few alternatives exist. To the best knowledge of the authors, it is the first time that white-light interferometric microscopy is used to measure full-field strains. The technique is reasonably easy to set up although a number of limitations exist. The paper is concluded by some considerations about further work required to extend the range of applicability of the method
0167-6636
1207-1222
Moulart, Raphaël
2d4f008e-a8a6-4e95-9e18-ee0c464787ed
Rotinat, René
e91eb3ac-786d-48dd-b46d-390287afd705
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Moulart, Raphaël
2d4f008e-a8a6-4e95-9e18-ee0c464787ed
Rotinat, René
e91eb3ac-786d-48dd-b46d-390287afd705
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Moulart, Raphaël, Rotinat, René and Pierron, Fabrice (2009) Full-field evaluation of the onset of microplasticity in a steel specimen. Mechanics of Materials, 41 (11), 1207-1222. (doi:10.1016/j.mechmat.2009.07.002).

Record type: Article

Abstract

This work deals with the study of the local onset of microplasticity in a steel specimen under tensile test through the use of a full-field strain measurement method at the micrometric scale. The kinematic measurements were performed by the so called grid method. In order to produce the gratings, direct interferential photolithography was used. The gratings were digitized through the use of a white-light interferometric microscope. An adapted image stitching algorithm, applied to the phase maps, has been developed and implemented in order to extend the size of the region of interest. With this method, and by paying a particular attention to the conduct of the mechanical tests, the strain resolution obtained ranges from 1 to 2 × 10?3 for a spatial resolution of about 20 ?m. In this paper, the method was applied to the study of the onset of local elasto-plastic strains in a ferritic steel coupon. The results show that the method is well suited to study small localized strains, for which few alternatives exist. To the best knowledge of the authors, it is the first time that white-light interferometric microscopy is used to measure full-field strains. The technique is reasonably easy to set up although a number of limitations exist. The paper is concluded by some considerations about further work required to extend the range of applicability of the method

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More information

e-pub ahead of print date: 18 July 2009
Published date: November 2009
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 210613
URI: https://eprints.soton.ac.uk/id/eprint/210613
ISSN: 0167-6636
PURE UUID: 04df11bd-2776-45bb-8e9d-c2956f82d246
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 13 Feb 2012 11:27
Last modified: 06 Jun 2018 12:34

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