Title :

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

Author(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]
Laboratoire Magmas et Volcans [LMV]
Géosciences Montpellier
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

Journal title :

Modelling and Simulation in Materials Science and Engineering

Abbreviated title :

Modelling Simul. Mater. Sci. Eng.

Volume number :

32

Pages :

015004

Publisher :

IOP Publishing

Publication date :

2023-11-07

HAL domain(s) :

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

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

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

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Plasticité

Submission date :

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