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Title: Modeling dislocation sources and size effects at initial yield in continuum plasticity
Authors: Puri, Saurabh
Roy, Anish
Acharya, Amit
Dimiduk, Dennis
Keywords: Continuum plasticity
Finite elements
Issue Date: 2009
Publisher: Mathematical Sciences Publishers
Citation: PURI, S. ... et al, 2009. Modeling dislocation sources and size effects at initial yield in continuum plasticity. Journal of Mechanics of Materials and Structures, 4 (9), pp. 1603 - 1618.
Abstract: Size effects at initial yield (prior to stage II) of idealized micron-sized specimens are modeled within a continuum model of plasticity. Two different aspects are considered: specification of a density of dislocation sources that represent the emission of dislocation dipoles, and the presence of an initial, spatially inhomogeneous excess dislocation content. Discreteness of the source distribution appears to lead to a stochastic response in stress-strain curves, with the stochasticity diminishing as the number of sources increases. Variability in stress-strain response due to variations of source distribution is also shown. These size effects at initial yield are inferred to be due to physical length scales in dislocation mobility and the discrete description of sources that induce internal-stress-related effects, and not due to length-scale effects in the mean-field strain-hardening response (as represented through a constitutive equation).
Description: First published in Journal of Mechanics of Materials and Structures in 2009 vol 4 pt. 9, published by Mathematical Sciences Publishers.
Version: Published
DOI: 10.2140/jomms.2009.4.1603
URI: https://dspace.lboro.ac.uk/2134/14892
Publisher Link: http://dx.doi.org/10.2140/jomms.2009.4.1603
ISSN: 1559-3959
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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