Titre :

From Electron Tomography of Dislocations to Field Dislocation Mechanics: Application to Olivine

Auteur(s) :

Weidner, Timmo [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Taupin, Vincent [Auteur]
Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
Demouchy, Sylvie [Auteur]
Géosciences Montpellier
Laboratoire Magmas et Volcans [LMV]
Gouriet, Karine [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Guitton, Antoine [Auteur]
Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Mussi, Alexandre [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207

Titre de la revue :

Modelling and Simulation in Materials Science and Engineering

Nom court de la revue :

Modelling Simul. Mater. Sci. Eng.

Numéro :

32

Pagination :

015004

Éditeur :

IOP Publishing

Date de publication :

2023-11-07

Discipline(s) HAL :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

Résumé en anglais : [en]

We propose a new procedure to extract information from electron tomography and use them as an input in a field dislocation mechanics. Dislocation electron tomography is an experimental technique that provides three-dimensional ...
Lire la suite >We propose a new procedure to extract information from electron tomography and use them as an input in a field dislocation mechanics. Dislocation electron tomography is an experimental technique that provides three-dimensional information on dislocation lines and Burgers vectors within a thin foil. The characterized 3D dislocation lines are used to construct the spatial distribution of the equivalent Nye dislocation density tensor. The model dislocation lattice incompatibility equation and stress balance equation are solved with a spectral code based on fast Fourier transform algorithms. As an output of the model, one obtains the three-dimensional distribution of mechanical fields, such as strains, rotations, stresses, resolved shear stresses and energy, inside the material. To assess the potential of the method, we consider two regions from a previously compressed olivine sample. Our results reveal significant local variations in local stress fields and resolved shear stresses in various slip systems, which can impact the strong plastic anisotropy of olivine and the activation of different dislocation slip systems. It also evidences the built-up of kinematic hardening down to the nanometre scale.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Projet Européen :

Rheology of Earth materials: closing the gap between TIMEscales in the laboratory and in the MANtle

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Plasticité

Date de dépôt :

2023-11-24T17:07:57Z
2023-12-14T09:08:48Z