A phenomenological variational multiscale constitutive model for intergranular failure in nanocrystalline materials

Handle URI:
http://hdl.handle.net/10754/594294
Title:
A phenomenological variational multiscale constitutive model for intergranular failure in nanocrystalline materials
Authors:
Siddiq, A.; El Sayed, Tamer S.
Abstract:
We present a variational multiscale constitutive model that accounts for intergranular failure in nanocrystalline fcc metals due to void growth and coalescence in the grain boundary region. Following previous work by the authors, a nanocrystalline material is modeled as a two-phase material consisting of a grain interior phase and a grain boundary affected zone (GBAZ). A crystal plasticity model that accounts for the transition from partial dislocation to full dislocation mediated plasticity is used for the grain interior. Isotropic porous plasticity model with further extension to account for failure due to the void coalescence was used for the GBAZ. The extended model contains all the deformation phases, i.e. elastic deformation, plastic deformation including deviatoric and volumetric plasticity (void growth) followed by damage initiation and evolution due to void coalescence. Parametric studies have been performed to assess the model's dependence on the different input parameters. The model is then validated against uniaxial loading experiments for different materials. Lastly we show the model's ability to predict the damage and fracture of a dog-bone shaped specimen as observed experimentally. © 2013 Elsevier B.V.
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Physical Sciences and Engineering (PSE) Division
Citation:
Siddiq A, El Sayed T (2013) A phenomenological variational multiscale constitutive model for intergranular failure in nanocrystalline materials. Materials Letters 107: 56–59. Available: http://dx.doi.org/10.1016/j.matlet.2013.05.097.
Publisher:
Elsevier BV
Journal:
Materials Letters
Issue Date:
Sep-2013
DOI:
10.1016/j.matlet.2013.05.097
Type:
Article
ISSN:
0167-577X
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.authorSiddiq, A.en
dc.contributor.authorEl Sayed, Tamer S.en
dc.date.accessioned2016-01-19T14:45:24Zen
dc.date.available2016-01-19T14:45:24Zen
dc.date.issued2013-09en
dc.identifier.citationSiddiq A, El Sayed T (2013) A phenomenological variational multiscale constitutive model for intergranular failure in nanocrystalline materials. Materials Letters 107: 56–59. Available: http://dx.doi.org/10.1016/j.matlet.2013.05.097.en
dc.identifier.issn0167-577Xen
dc.identifier.doi10.1016/j.matlet.2013.05.097en
dc.identifier.urihttp://hdl.handle.net/10754/594294en
dc.description.abstractWe present a variational multiscale constitutive model that accounts for intergranular failure in nanocrystalline fcc metals due to void growth and coalescence in the grain boundary region. Following previous work by the authors, a nanocrystalline material is modeled as a two-phase material consisting of a grain interior phase and a grain boundary affected zone (GBAZ). A crystal plasticity model that accounts for the transition from partial dislocation to full dislocation mediated plasticity is used for the grain interior. Isotropic porous plasticity model with further extension to account for failure due to the void coalescence was used for the GBAZ. The extended model contains all the deformation phases, i.e. elastic deformation, plastic deformation including deviatoric and volumetric plasticity (void growth) followed by damage initiation and evolution due to void coalescence. Parametric studies have been performed to assess the model's dependence on the different input parameters. The model is then validated against uniaxial loading experiments for different materials. Lastly we show the model's ability to predict the damage and fracture of a dog-bone shaped specimen as observed experimentally. © 2013 Elsevier B.V.en
dc.description.sponsorshipThis work was fully funded by the KAUST baseline fund.en
dc.publisherElsevier BVen
dc.subjectCrystal plasticity theoryen
dc.subjectIntergranular failureen
dc.subjectNanocrystalline materialsen
dc.subjectVariational updatesen
dc.titleA phenomenological variational multiscale constitutive model for intergranular failure in nanocrystalline materialsen
dc.typeArticleen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalMaterials Lettersen
dc.contributor.institutionDepartment of Design, Manufacture and Engineering Management, University of Strathclyde, Glasgow G1 1XQ, United Kingdomen
kaust.authorSiddiq, A.en
kaust.authorEl Sayed, Tamer S.en
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