A two-scale model predicting the mechanical behavior of nanocrystalline solids
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 plastici...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2013
|
| _version_ | 1797102453645115392 |
|---|---|
| author | Péron-Lührs, V Jérusalem, A Sansoz, F Stainier, L Noels, L |
| author_facet | Péron-Lührs, V Jérusalem, A Sansoz, F Stainier, L Noels, L |
| author_sort | Péron-Lührs, V |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T06:06:16Z |
| format | Journal article |
| id | oxford-uuid:edf527a7-c823-4b3d-b3d7-269096bd7876 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:06:16Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | oxford-uuid:edf527a7-c823-4b3d-b3d7-269096bd78762022-03-27T11:29:02ZA two-scale model predicting the mechanical behavior of nanocrystalline solidsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:edf527a7-c823-4b3d-b3d7-269096bd7876EnglishSymplectic Elements at Oxford2013Péron-Lührs, VJérusalem, ASansoz, FStainier, LNoels, LPolycrystalline 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. |
| spellingShingle | Péron-Lührs, V Jérusalem, A Sansoz, F Stainier, L Noels, L A two-scale model predicting the mechanical behavior of nanocrystalline solids |
| title | A two-scale model predicting the mechanical behavior of nanocrystalline solids |
| title_full | A two-scale model predicting the mechanical behavior of nanocrystalline solids |
| title_fullStr | A two-scale model predicting the mechanical behavior of nanocrystalline solids |
| title_full_unstemmed | A two-scale model predicting the mechanical behavior of nanocrystalline solids |
| title_short | A two-scale model predicting the mechanical behavior of nanocrystalline solids |
| title_sort | two scale model predicting the mechanical behavior of nanocrystalline solids |
| work_keys_str_mv | AT peronluhrsv atwoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT jerusalema atwoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT sansozf atwoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT stainierl atwoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT noelsl atwoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT peronluhrsv twoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT jerusalema twoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT sansozf twoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT stainierl twoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids AT noelsl twoscalemodelpredictingthemechanicalbehaviorofnanocrystallinesolids |