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

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    Type
    Article
    Authors
    Gurses, Ercan
    El Sayed, Tamer S.
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Physical Science and Engineering (PSE) Division
    Date
    2011-05
    Permanent link to this record
    http://hdl.handle.net/10754/561762
    
    Metadata
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    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.
    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.2011.02.013
    Sponsors
    This work was fully funded by the KAUST baseline fund.
    Publisher
    Elsevier BV
    Journal
    International Journal of Solids and Structures
    DOI
    10.1016/j.ijsolstr.2011.02.013
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijsolstr.2011.02.013
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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