Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals
dc.contributor.author | Gurses, Ercan | |
dc.contributor.author | El Sayed, Tamer S. | |
dc.date.accessioned | 2015-08-03T09:04:02Z | |
dc.date.available | 2015-08-03T09:04:02Z | |
dc.date.issued | 2011-05 | |
dc.identifier.issn | 00207683 | |
dc.identifier.doi | 10.1016/j.ijsolstr.2011.02.013 | |
dc.identifier.uri | http://hdl.handle.net/10754/561762 | |
dc.description.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. | |
dc.description.sponsorship | This work was fully funded by the KAUST baseline fund. | |
dc.publisher | Elsevier BV | |
dc.subject | Constitutive modeling | |
dc.subject | Crystal plasticity | |
dc.subject | Grain size | |
dc.subject | Nanocrystals | |
dc.subject | Rate dependence | |
dc.title | Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals | |
dc.type | Article | |
dc.contributor.department | Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division | |
dc.contributor.department | Physical Science and Engineering (PSE) Division | |
dc.identifier.journal | International Journal of Solids and Structures | |
kaust.person | Gurses, Ercan | |
kaust.person | El Sayed, Tamer S. |
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