Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals
Type
ArticleAuthors
Gurses, ErcanEl Sayed, Tamer S.
KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionPhysical Science and Engineering (PSE) Division
Date
2011-05Permanent link to this record
http://hdl.handle.net/10754/561762
Metadata
Show full item recordAbstract
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.Citation
Gürses, E., & El Sayed, T. (2011). Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals. International Journal of Solids and Structures, 48(10), 1610–1616. doi:10.1016/j.ijsolstr.2011.02.013Sponsors
This work was fully funded by the KAUST baseline fund.Publisher
Elsevier BVae974a485f413a2113503eed53cd6c53
10.1016/j.ijsolstr.2011.02.013