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A model problem concerning recoverable strains of shape-memory polycrystals

Bhattacharya, K. and Suquet, P. M. (2005) A model problem concerning recoverable strains of shape-memory polycrystals. Proceedings of the Royal Society A: Mathematical, physical, and engineering sciences, 461 (2061). pp. 2797-2816. ISSN 1364-5021.

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This paper addresses a model problem of nonlinear homogenization motivated by the study of the shape-memory effect in polycrystalline media. Specifically, it numerically computes the set of recoverable strains in a polycrystal given the set of recoverable strains of a single crystal in the two-dimensional scalar (or antiplane shear) setting. This problem shares a direct analogy with crystal plasticity. The paper considers typical or random polycrystals where the grains are generated by a Voronoi tesselation of a set of random points and are randomly oriented. The numerical results show that for such microstructures, the Taylor bound appears to be the most accurate (though pessimistic) bound when the anisotropy is moderate, and that recent Kohn–Little–Goldsztein outer bounds overestimate the recoverable strains when the anisotropy is large. The results also show that the stress tends to localize on tortuous paths that traverse (poorly oriented) grains as the polycrystal reaches its limit of recoverable strain.

Item Type:Article
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URLURL TypeDescription DOIArticle
Bhattacharya, K.0000-0003-2908-5469
Additional Information:© 2005 The Royal Society. Published online 28 July 2005. This research was initiated when P.S. spent a sabbatical in Caltech during 2000 and 2001. We gratefully acknowledge the partial financial support of the US National Science Foundation, US Air Force Office of Scientific Research, Centre National de la Recherche Scientifique, French Délégation Générale à l’Armement during this work.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Délégation Générale à l’ArmementUNSPECIFIED
Subject Keywords:shape-memory effect; homogenization; plasticity; locking materials; stress localization; strain localization
Issue or Number:2061
Record Number:CaltechAUTHORS:20131007-125756465
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41714
Deposited By: Tony Diaz
Deposited On:07 Oct 2013 20:11
Last Modified:03 Oct 2019 05:51

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