Reference : A two-scale model predicting the mechanical behavior of nanocrystalline solids
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/147765
A two-scale model predicting the mechanical behavior of nanocrystalline solids
English
Péron-Lührs, Vincent mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Milieux continus et thermomécanique >]
Jérusalem, Antoine [University of Oxford > > > >]
Sansoz, Frédéric [University of Vermont > > > >]
Stainier, Laurent [Ecole Centrale de Nantes > > > >]
Noels, Ludovic mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3) >]
Sep-2013
Journal of the Mechanics and Physics of Solids
Pergamon Press - An Imprint of Elsevier Science
61
9
1895-1914
Yes (verified by ORBi)
International
0022-5096
Oxford
United Kingdom
[en] Nanocrystal ; Grain boundary deformation ; Crystal plasticity ; Quasicontinuum method ; Finite element method ; LIMARC
[en] Polycrystalline materials, with nanosized grains (<100 nm), exhibit superior strength exceeding those of their coarse-grained counterparts. With such small grains, the deformation mechanisms taking place at grain boundaries (GBs) become dominant compared to the intragranular crystal plasticity. Recent studies have revealed that the deformation mechanisms are influenced by the GB network. For instance, a high yield stress in nanostructured metals can be obtained by choosing the relevant grain boundary character distribution (GBCD). In this paper we present an original numerical multiscale approach to predict the mechanical behavior of nanostructured metals according to their GBCD composed of either high angle (HA) GBs (HAB) or low angle (LA) GBs (LAB). Molecular simulations using the quasicontinuum method (QC) are performed to obtain the mechanical response at the nanoscale of GB undergoing simple shear (GB sliding behavior) and tensile loads (GB opening behavior). To simulate the grain behavior, a mechanical model of dislocation motions through a forest dislocation is calibrated using a nanoindentation simulation performed with QC. These QC results are then used in a finite element code (direct numerical simulation-DNS) as a GB constitutive model and as a grain constitutive model. This two-scale framework does not suffer from length scale limitations conventionally encountered when considering the two scales separately.
Computational & Multiscale Mechanics of Materials
CECI
Researchers ; Professionals
http://hdl.handle.net/2268/147765
10.1016/j.jmps.2013.04.009
http://dx.doi.org/10.1016/j.jmps.2013.04.009
NOTICE: this is the author’s version of a work that was accepted for publication in Journal of the Mechanics and Physics of Solids . Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of the Mechanics and Physics of Solids , 61(9),2013, DOI: 10.1016/j.jmps.2013.04.009

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