Elastoviscoplastic micromechanical modeling of the transient creep of ice
International audience A salient feature of the rheology of isotropic polycrystalline ices is the decrease of the strain rate by more than 2 orders of magnitude during transient creep tests to reach a secondary creep regime at a strain which is systematically of ∼1%. We use a recent (so-called “affi...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2008
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329/document https://hal-insu.archives-ouvertes.fr/insu-00378329/file/2008JB005751.pdf https://doi.org/10.1029/2008JB005751 |
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ftunivnantes:oai:HAL:insu-00378329v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
micromechanic polycrystal homogenization [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
micromechanic polycrystal homogenization [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Castelnau, Olivier Duval, Paul Montagnat, Maurine Brenner, Renald Elastoviscoplastic micromechanical modeling of the transient creep of ice |
topic_facet |
micromechanic polycrystal homogenization [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience A salient feature of the rheology of isotropic polycrystalline ices is the decrease of the strain rate by more than 2 orders of magnitude during transient creep tests to reach a secondary creep regime at a strain which is systematically of ∼1%. We use a recent (so-called “affine”) version of the self-consistent mean-field theory to model the elastoviscoplastic behavior of ice. The model aims at bridging scales between the rheology of single grain and the one of polycrystals by evaluating the intergranular interactions. It takes into account the long-term memory effects, which manifests itself by the fact that local stress and strain rate in grains depend on the whole mechanical history of the polycrystal. It is shown that the strong hardening amplitude during the transient creep is entirely explained by the stress redistribution within the specimen, from an almost uniform stress distribution upon instantaneous loading (purely elastic response) to strong interphase and intraphase heterogeneities in the stationary regime (purely viscoplastic response). The experimental hardening kinetic is much too slow to be explained by the same process; it is attributed to the hardening of hard glide slip systems (prismatic slip) in the transient regime. Moreover, the model very well reproduces the permanent creep rate of several highly anisotropic specimens of the Greenland Ice Core Project ice core (pronounced crystallographic textures), when accounting for a single-grain rheology that well matches the experimental one. Our results are consistent with recent findings concerning dislocation dynamics in ice. |
author2 |
Propriétés mécaniques et thermodynamiques des matériaux (PMTM) Centre National de la Recherche Scientifique (CNRS) Institute of Geophysics and Planetary Physics San Diego (IGPP) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC)-University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Castelnau, Olivier Duval, Paul Montagnat, Maurine Brenner, Renald |
author_facet |
Castelnau, Olivier Duval, Paul Montagnat, Maurine Brenner, Renald |
author_sort |
Castelnau, Olivier |
title |
Elastoviscoplastic micromechanical modeling of the transient creep of ice |
title_short |
Elastoviscoplastic micromechanical modeling of the transient creep of ice |
title_full |
Elastoviscoplastic micromechanical modeling of the transient creep of ice |
title_fullStr |
Elastoviscoplastic micromechanical modeling of the transient creep of ice |
title_full_unstemmed |
Elastoviscoplastic micromechanical modeling of the transient creep of ice |
title_sort |
elastoviscoplastic micromechanical modeling of the transient creep of ice |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329/document https://hal-insu.archives-ouvertes.fr/insu-00378329/file/2008JB005751.pdf https://doi.org/10.1029/2008JB005751 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project ice core |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project ice core |
op_source |
ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal-insu.archives-ouvertes.fr/insu-00378329 Journal of Geophysical Research : Solid Earth, 2008, 113 (B11203), 1 à 14 p. ⟨10.1029/2008JB005751⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JB005751 insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329/document https://hal-insu.archives-ouvertes.fr/insu-00378329/file/2008JB005751.pdf doi:10.1029/2008JB005751 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2008JB005751 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
B11 |
_version_ |
1766019611837333504 |
spelling |
ftunivnantes:oai:HAL:insu-00378329v1 2023-05-15T16:29:54+02:00 Elastoviscoplastic micromechanical modeling of the transient creep of ice Castelnau, Olivier Duval, Paul Montagnat, Maurine Brenner, Renald Propriétés mécaniques et thermodynamiques des matériaux (PMTM) Centre National de la Recherche Scientifique (CNRS) Institute of Geophysics and Planetary Physics San Diego (IGPP) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC)-University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal-insu.archives-ouvertes.fr/insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329/document https://hal-insu.archives-ouvertes.fr/insu-00378329/file/2008JB005751.pdf https://doi.org/10.1029/2008JB005751 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JB005751 insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329 https://hal-insu.archives-ouvertes.fr/insu-00378329/document https://hal-insu.archives-ouvertes.fr/insu-00378329/file/2008JB005751.pdf doi:10.1029/2008JB005751 info:eu-repo/semantics/OpenAccess ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal-insu.archives-ouvertes.fr/insu-00378329 Journal of Geophysical Research : Solid Earth, 2008, 113 (B11203), 1 à 14 p. ⟨10.1029/2008JB005751⟩ micromechanic polycrystal homogenization [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2008 ftunivnantes https://doi.org/10.1029/2008JB005751 2022-12-07T01:04:09Z International audience A salient feature of the rheology of isotropic polycrystalline ices is the decrease of the strain rate by more than 2 orders of magnitude during transient creep tests to reach a secondary creep regime at a strain which is systematically of ∼1%. We use a recent (so-called “affine”) version of the self-consistent mean-field theory to model the elastoviscoplastic behavior of ice. The model aims at bridging scales between the rheology of single grain and the one of polycrystals by evaluating the intergranular interactions. It takes into account the long-term memory effects, which manifests itself by the fact that local stress and strain rate in grains depend on the whole mechanical history of the polycrystal. It is shown that the strong hardening amplitude during the transient creep is entirely explained by the stress redistribution within the specimen, from an almost uniform stress distribution upon instantaneous loading (purely elastic response) to strong interphase and intraphase heterogeneities in the stationary regime (purely viscoplastic response). The experimental hardening kinetic is much too slow to be explained by the same process; it is attributed to the hardening of hard glide slip systems (prismatic slip) in the transient regime. Moreover, the model very well reproduces the permanent creep rate of several highly anisotropic specimens of the Greenland Ice Core Project ice core (pronounced crystallographic textures), when accounting for a single-grain rheology that well matches the experimental one. Our results are consistent with recent findings concerning dislocation dynamics in ice. Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project ice core Université de Nantes: HAL-UNIV-NANTES Greenland Journal of Geophysical Research 113 B11 |