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Comparisons of elastic and creep deformation linearly dependent upon stress

Greenwood, G.W (2009) Comparisons of elastic and creep deformation linearly dependent upon stress. Materials Science and Technology -London-, 25 (4). pp. 533-541. ISSN 0267-0836

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Abstract

The theory of linear elasticity provides a complete description of reversible deformation under small stresses for both isotropic and anisotropic solids. At elevated temperatures, creep deformation sometimes occurs at a rate that is linearly dependent upon stress. When this form of creep arises from vacancy movement, there is possibility of anisotropic behaviour through the orientational dependence of average grain dimensions. This indicates that the elasticity theory may be utilised to provide comparable descriptions of such creep deformation, with creep strain built up of equal increments of strain occurring in equal intervals of time. The extent of this analogy is explored with the conclusion that its usefulness is substantial when grains are small in relation to geometrical features of the component but it is no longer applicable when the grains approach the size of these features and where there is a high gradient of stress.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Institute of Materials, published by Maney on behalf of the Institute. Reproduced in accordance with the publisher's self-archiving policy.
Keywords: Elasticity; Anisotropy; Creep; Deformation geometry
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 13 Jul 2009 08:20
Last Modified: 07 Jun 2014 08:39
Published Version: http://dx.doi.org/10.1179/174328408X322105
Status: Published
Publisher: INSTITUTE OF MATERIALS
Identification Number: 10.1179/174328408X322105
URI: http://eprints.whiterose.ac.uk/id/eprint/9000

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