Thomas Chauve

Thomas Chauve
Université Grenoble Alpes · Institut des Géosciences de l'Environnement

PhD
https://gricad-gitlab.univ-grenoble-alpes.fr/mecaiceige

About

22
Publications
4,385
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169
Citations
Additional affiliations
January 2018 - January 2020
University of Oslo
Position
  • PostDoc Position

Publications

Publications (22)
Article
Full-text available
Nucleation mechanisms occurring during discontinuous dynamic recrystallization (DDRX) is investigated by Digital Image Correlation (DIC) during creep experiment on polycrystalline columnar ice. Thanks to the columnar microstructure, discrimination of the nucleus can be done without ambiguity comparing pre-and post-deformation texture. In-situ DIC a...
Preprint
Full-text available
We explore the links between the evolutions of the strain field and microstructure in coarse-grained Ih ice. Using digital image correlation (DIC), we monitored the evolution of the strain field in two columnar ice samples deformed by creep (uniaxial compression at constant load) at −7 °C and 0.5 MPa up to 9.5% bulk shortening. After a brief transi...
Article
Full-text available
The process of primary migration, which controls the transfer of hydrocarbons from source to reservoir rocks, necessitates the existence of fluid pathways in low permeability sedimentary formations. Primary migration starts with the maturation of organic matter that produces fluids which increase the effective stress locally. The interactions betwe...
Article
Full-text available
Torsion experiments were performed in polycrystalline ice at high temperature (0.97 Tm) to reproduce the simple shear kinematics that are believed to dominate in ice streams and at the base of fast-flowing glaciers. As clearly documented more than 30 years ago, under simple shear ice develops a two-maxima c axis crystallographic preferred orientati...
Conference Paper
Full-text available
Primary migration in shales controls the expulsion of gas and oil from the source rock into a reservoir and the long term permeability of caprocks. Experimental studies that use dynamic in-situ X-ray tomography have shown that, under heating, an immature shale produces hydrocarbon that is expelled through the formation of microfractures that increa...
Article
Full-text available
Torsion experiments were performed in polycrystalline ice at high temperature (0.97⋅Tm) to reproduce simple shear conditions close to those encountered in ice streams and at the base of fast flowing glaciers. As well documented more than 30 years ago (Hudleston, 1977; Bouchez and Duval, 1982), under simple shear ice develops a two-maxima c-axis tex...
Article
Full-text available
This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanis...
Article
Prediction of ice mass flow and associated dynamics is pivotal at a time of climate change. Ice flow is dominantly accommodated by the motion of crystal defects – the dislocations. In the specific case of ice, their observation is not always accessible by means of the classical tools such as X-ray diffraction or transmission electron microscopy (TE...
Article
We studied the evolution of the microstructure of ice-Ih during static recrystallization by stepwise annealing experiments. We alternated thermal annealing and electron backscatter diffraction (EBSD) analyses on polycrystalline columnar ice pre-deformed in uniaxial compression at temperature of −7 °C to macroscopic strains of 3.0–5.2. Annealing exp...
Article
Full-text available
This paper presents, for the first time, the evolution of local strain fields around intragranular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at crack tips is relaxed by plastic mechanisms associated with dyn...
Article
Full-text available
A model based on the elastic theory of continuously distributed dislocations, accounting for the transport of geometrically necessary dislocations (GND) on slip systems is developed. It allows keeping the crystallographic nature of glide by allocating velocities specific to slip systems to GND. At grain boundaries, the dislocation transport equatio...
Article
Full-text available
Nucleation mechanisms occurring during dynamic recrystallization play a crucial role in the evolution of microstructures and textures during high temperature deformation. In polycrystalline ice, the strong viscoplastic anisotropy induces high strain heterogeneities between grains which control the recrystallization mechanisms. Here, we study the nu...
Thesis
Full-text available
Ice is an hexagonal material in which deformation mainly occurs by dislocation glide along the basal plane conferring a strong viscoplastic anisotropy to the single crystal. Hence, during polycrystalline ice deformation the incompatibility between grains lead to highly heterogeneous strain. During ice creep at high temperature, dynamic recrystallis...
Data
Full-text available
Article
Full-text available
This ESM provide a detailled description of some tilt sub-grain boundary observed, and a reflexion, and energy calculation, supporting the selected transition between sub-grain boundary and grain boundary
Article
Full-text available
This ESM provide a detailled description of some tilt sub-grain boundary observed, and a reflexion, and energy calculation, supporting the selected transition between sub-grain boundary and grain boundary
Article
Full-text available
We present high resolution observations of microstructure and texture evolution during dynamic recrystallization (DRX) of ice polycrystals deformed in the laboratory at high temperature (≈0.98Tm). Ice possesses a significant viscoplastic anisotropy that induces strong strain heterogeneities, which result in an early occurrence of DRX mechanisms. It...
Conference Paper
Dynamic recrystallization (DRX) strongly affects the evolution of microstructure (grain size and shape) and texture (crystal preferred orientation) during deformation at high temperature. Since texturing leads to anisotropic physical properties, predicting the effect of DRX in metals is essential for industrial applications, in rocks for interpreti...
Conference Paper
Water ice Ih is a material with very high plastic anisotropy where deformation is mainly accommodated by dislocation glide on the (0001) plane. This anisotropy gives rise to strong strain incompatibilities between grains during deformation, and therefore impacts texture and microstructure evolution. Accurate understanding of ice mechanical properti...