Abstract
We present a variational two-phase constitutive model capable of capturing the enhanced rate sensitivity in nanocrystalline (nc) and ultrafine-grained (ufg) fcc metals. The nc/ufg-material consists of a grain interior phase and a grain boundary affected zone (GBAZ). The behavior of the GBAZ is described by a rate-dependent isotropic porous plasticity model, whereas a rate-independent crystal-plasticity model which accounts for the transition from partial dislocation to full dislocation mediated plasticity is employed for the grain interior. The scale bridging from a single grain to a polycrystal is done by a Taylor-type homogenization. It is shown that the enhanced rate sensitivity caused by the grain size refinement is successfully captured by the proposed model. © 2011 Elsevier Ltd. All rights reserved.
Original language | English (US) |
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Pages (from-to) | 1610-1616 |
Number of pages | 7 |
Journal | International Journal of Solids and Structures |
Volume | 48 |
Issue number | 10 |
DOIs | |
State | Published - May 2011 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: This work was fully funded by the KAUST baseline fund.
ASJC Scopus subject areas
- Mechanics of Materials
- Modeling and Simulation
- General Materials Science
- Mechanical Engineering
- Applied Mathematics
- Condensed Matter Physics