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Title: Further development of the hybrid model for polycrystal deformation

Abstract

The Kocks-Mecking hybrid model for polycrystal deformation has been developed further, in order to obtain an easy definition of polycrystalline behavior, from knowledge of the single crystal stress-strain curves. The hybrid model is a one-parameter theory that considers the flow stress governed by total dislocation density. This is the addition of the statistically stored dislocations, independent of the grain size, and the geometrical dislocations, necessary to accommodate the deformation, and thus dependent on the grain size (as proposed by Ashby). The condition for the onset of necking is used to determine the parameters of the equation of the model. The analytical description of the resulting flow law was used to analyze the tensile behavior of copper sheets, with five different grain sizes, which were deformed at three different strain rates.

Authors:
;
Publication Date:
Research Org.:
Univ. de Coimbra (PT)
OSTI Identifier:
20075943
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEFORMATION; METALS; MATHEMATICAL MODELS; DISLOCATIONS; FLOW STRESS; STRAIN RATE; GRAIN SIZE

Citation Formats

Fernandes, J.V., and Vieira, M.F. Further development of the hybrid model for polycrystal deformation. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00466-8.
Fernandes, J.V., & Vieira, M.F. Further development of the hybrid model for polycrystal deformation. United States. doi:10.1016/S1359-6454(99)00466-8.
Fernandes, J.V., and Vieira, M.F. Thu . "Further development of the hybrid model for polycrystal deformation". United States. doi:10.1016/S1359-6454(99)00466-8.
@article{osti_20075943,
title = {Further development of the hybrid model for polycrystal deformation},
author = {Fernandes, J.V. and Vieira, M.F.},
abstractNote = {The Kocks-Mecking hybrid model for polycrystal deformation has been developed further, in order to obtain an easy definition of polycrystalline behavior, from knowledge of the single crystal stress-strain curves. The hybrid model is a one-parameter theory that considers the flow stress governed by total dislocation density. This is the addition of the statistically stored dislocations, independent of the grain size, and the geometrical dislocations, necessary to accommodate the deformation, and thus dependent on the grain size (as proposed by Ashby). The condition for the onset of necking is used to determine the parameters of the equation of the model. The analytical description of the resulting flow law was used to analyze the tensile behavior of copper sheets, with five different grain sizes, which were deformed at three different strain rates.},
doi = {10.1016/S1359-6454(99)00466-8},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}