Ensemble averaging stress-strain fields in polycrystalline aggregates with a constrained surface microstructure-Part 1: Computational tools and application to anisotropic elastic behaviour - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Philosophical Magazine Année : 2007

Ensemble averaging stress-strain fields in polycrystalline aggregates with a constrained surface microstructure-Part 1: Computational tools and application to anisotropic elastic behaviour

Asmahana Zeghadi
  • Fonction : Auteur
  • PersonId : 877551
Franck N'Guyen
Samuel Forest
Connectez-vous pour contacter l'auteur
Olivier Bouaziz

Résumé

The effect of three-dimensional grain morphology on the deformation at a free surface in polycrystalline aggregates is investigated by means of a large scale finite element and statistical approach. For a given 2D surface at z=0 containing 39 grains with given lattice orientations, 17 random 3D polycrystalline aggregates are constructed having different 3D grain shapes and orientations except at z=0, based on an original 3D image analysis procedure. They are subjected to overall tensile loading conditions. The resulting stress-strain fields at the free surface z=0 are analysed. Ensemble average and variance maps of the stress field at the observed surface are computed. In the case of an anisotropic elastic behaviour of the grains, fluctuations ranging between 5% and 60% are found in the equivalent stress level at a given material point of the observed surface from one realization of the microstructure to another. The obtained fields are compared to the prediction based on the associated columnar grain microstructure, often used in literature. These results have important implications in the way of comparing finite element simulations and surface strain field measurements in metal polycrystals.

Domaines

Matériaux
Fichier principal
Vignette du fichier
PEER_stage2_10.1080%2F14786430601009509.pdf (3.38 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00513781 , version 1 (01-09-2010)

Identifiants

Citer

Asmahana Zeghadi, Franck N'Guyen, Samuel Forest, Anne-Françoise Gourgues, Olivier Bouaziz. Ensemble averaging stress-strain fields in polycrystalline aggregates with a constrained surface microstructure-Part 1: Computational tools and application to anisotropic elastic behaviour. Philosophical Magazine, 2007, 87, pp.1401-1424. ⟨10.1080/14786430601009509⟩. ⟨hal-00513781⟩
195 Consultations
157 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More