A Maxwell elasto-brittle rheology for sea ice modelling
A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the mat...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-10-1339-2016 https://tc.copernicus.org/articles/10/1339/2016/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc48129 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc48129 2023-05-15T18:17:26+02:00 A Maxwell elasto-brittle rheology for sea ice modelling Dansereau, Véronique Weiss, Jérôme Saramito, Pierre Lattes, Philippe 2018-09-27 application/pdf https://doi.org/10.5194/tc-10-1339-2016 https://tc.copernicus.org/articles/10/1339/2016/ eng eng doi:10.5194/tc-10-1339-2016 https://tc.copernicus.org/articles/10/1339/2016/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-10-1339-2016 2020-07-20T16:24:06Z A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the material is highly damaged and fragmented. A viscous-like relaxation term is added to the linear-elastic constitutive law together with an effective viscosity that evolves according to the local level of damage of the material, like its elastic modulus. The coupling between the level of damage and both mechanical parameters is such that within an undamaged ice cover the viscosity is infinitely large and deformations are strictly elastic, while along highly damaged zones the elastic modulus vanishes and most of the stress is dissipated through permanent deformations. A healing mechanism is also introduced, counterbalancing the effects of damaging over large timescales. In this new model, named Maxwell-EB after the Maxwell rheology, the irreversible and reversible deformations are solved for simultaneously; hence drift velocities are defined naturally. First idealized simulations without advection show that the model reproduces the main characteristics of sea ice mechanics and deformation: strain localization, anisotropy, intermittency and associated scaling laws. Text Sea ice Copernicus Publications: E-Journals The Cryosphere 10 3 1339 1359 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the material is highly damaged and fragmented. A viscous-like relaxation term is added to the linear-elastic constitutive law together with an effective viscosity that evolves according to the local level of damage of the material, like its elastic modulus. The coupling between the level of damage and both mechanical parameters is such that within an undamaged ice cover the viscosity is infinitely large and deformations are strictly elastic, while along highly damaged zones the elastic modulus vanishes and most of the stress is dissipated through permanent deformations. A healing mechanism is also introduced, counterbalancing the effects of damaging over large timescales. In this new model, named Maxwell-EB after the Maxwell rheology, the irreversible and reversible deformations are solved for simultaneously; hence drift velocities are defined naturally. First idealized simulations without advection show that the model reproduces the main characteristics of sea ice mechanics and deformation: strain localization, anisotropy, intermittency and associated scaling laws. |
format |
Text |
author |
Dansereau, Véronique Weiss, Jérôme Saramito, Pierre Lattes, Philippe |
spellingShingle |
Dansereau, Véronique Weiss, Jérôme Saramito, Pierre Lattes, Philippe A Maxwell elasto-brittle rheology for sea ice modelling |
author_facet |
Dansereau, Véronique Weiss, Jérôme Saramito, Pierre Lattes, Philippe |
author_sort |
Dansereau, Véronique |
title |
A Maxwell elasto-brittle rheology for sea ice modelling |
title_short |
A Maxwell elasto-brittle rheology for sea ice modelling |
title_full |
A Maxwell elasto-brittle rheology for sea ice modelling |
title_fullStr |
A Maxwell elasto-brittle rheology for sea ice modelling |
title_full_unstemmed |
A Maxwell elasto-brittle rheology for sea ice modelling |
title_sort |
maxwell elasto-brittle rheology for sea ice modelling |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-10-1339-2016 https://tc.copernicus.org/articles/10/1339/2016/ |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-10-1339-2016 https://tc.copernicus.org/articles/10/1339/2016/ |
op_doi |
https://doi.org/10.5194/tc-10-1339-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
3 |
container_start_page |
1339 |
op_container_end_page |
1359 |
_version_ |
1766191656697069568 |