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Intrinsic and Extrinsic Size Effects in Plasticity by Dislocation Glide

Published online by Cambridge University Press:  21 March 2011

J. Gil Sevillano
J. Gil Sevillano*
Affiliation:
CEIT (Centro de Estudios e Investigaciones Técnicas de Guípúzcoa) and Faculty of Engineering, University of Navarra. P.O. Box 1555, 20080 San Sebastián, Spain
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Abstract

A classification of size effects (SE) in plasticity is attempted. ”Intrinsic” SE are perceived when any internal length scale directly influencing some process or property interferes with the size of the material region where the process is going on or when two internal length scales directly affecting the same process or property interfere. ”Extrinsic” SE arise from the external imposition of spatial gradients in the plastic process or by the building up of internal gradients by the (externally induced) process itself. In dislocation-mediated plasticity plastic strain gradients are resolved by the storage of geometrically necessary dislocations (GND) leading to prominent size effects. Of course, mixed effects with intrinsic and extrinsic contributions can be found as well as superposed effects involving more than two characteristic lengths (i.e., size effects on size effects).The inclusion of both types of SE in continuum or crystallographic theories is commented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 653: Symposium Z – Multiscale Modeling of Materials-2000 , 2000 , Z8.5.1
Copyright
Copyright © Materials Research Society 2001

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