A two-scale model predicting the mechanical behavior of nanocrystalline solids
| Autor: | Frederic Sansoz, Laurent Stainier, Ludovic Noels, Vincent Péron-Lührs, Antoine Jérusalem |
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| Přispěvatelé: | Aerospace and Mechanical Engineering Department [Liège] (LTAS), Université de Liège, University of Oxford [Oxford], University of Vermont [Burlington], Institut de Recherche en Génie Civil et Mécanique (GeM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
Length scale
Finite element method Materials science Crystal plasticity Constitutive equation 02 engineering and technology Nanocrystal [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph] 01 natural sciences Quasicontinuum method Grain boundary deformation 0103 physical sciences Composite material 010302 applied physics Mechanical Engineering Metallurgy Nanoindentation 021001 nanoscience & nanotechnology Condensed Matter Physics Simple shear Deformation mechanism Mechanics of Materials Grain boundary Crystallite Dislocation 0210 nano-technology |
| Zdroj: | Journal of the Mechanics and Physics of Solids Journal of the Mechanics and Physics of Solids, Elsevier, 2013, 61 (9), pp.1895-1914. ⟨10.1016/j.jmps.2013.04.009⟩ |
| ISSN: | 0022-5096 |
| DOI: | 10.1016/j.jmps.2013.04.009 |
| Popis: | 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. © 2013 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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