Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals

Handle URI:
http://hdl.handle.net/10754/561762
Title:
Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals
Authors:
Gurses, Ercan; El Sayed, Tamer S.
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.
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Physical Sciences and Engineering (PSE) Division
Publisher:
Elsevier BV
Journal:
International Journal of Solids and Structures
Issue Date:
May-2011
DOI:
10.1016/j.ijsolstr.2011.02.013
Type:
Article
ISSN:
00207683
Sponsors:
This work was fully funded by the KAUST baseline fund.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorGurses, Ercanen
dc.contributor.authorEl Sayed, Tamer S.en
dc.date.accessioned2015-08-03T09:04:02Zen
dc.date.available2015-08-03T09:04:02Zen
dc.date.issued2011-05en
dc.identifier.issn00207683en
dc.identifier.doi10.1016/j.ijsolstr.2011.02.013en
dc.identifier.urihttp://hdl.handle.net/10754/561762en
dc.description.abstractWe 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.en
dc.description.sponsorshipThis work was fully funded by the KAUST baseline fund.en
dc.publisherElsevier BVen
dc.subjectConstitutive modelingen
dc.subjectCrystal plasticityen
dc.subjectGrain sizeen
dc.subjectNanocrystalsen
dc.subjectRate dependenceen
dc.titleConstitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystalsen
dc.typeArticleen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalInternational Journal of Solids and Structuresen
kaust.authorGurses, Ercanen
kaust.authorEl Sayed, Tamer S.en
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