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Stress–elastic strain relation for a two-phase isotropic strain gradient plastic composite

Published online by Cambridge University Press:  01 August 2009

VIET HA HOANG
VIET HA HOANG*
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, UK email: V.H.Hoang@damtp.cam.ac.uk
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Abstract

The stress–elastic strain relationship is studied for a composite under a plastic deformation. The constitutive law of each component is described by a deformation theory of strain gradient plasticity which introduces an internal length scale. The conventional deformation plastic theory is obtained when the internal length scale tends to 0. The Hashin–Shtrikman upper bound for a two-phase composite governed by a power law is derived. It is predicted, by differentiating the bounds, that in most cases, the stress and the elastic strain follow a non-linear relation immediately after the elastic range. However, for some particular values of the ratio of the internal length scale and the micro-scale of the composite, this relation is linear. The prediction is illustrated by various numerical examples.

Type
Papers
Information
European Journal of Applied Mathematics , Volume 20 , Issue 4 , August 2009 , pp. 319 - 342
Copyright
Copyright © Cambridge University Press 2009

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