Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study
We performed numerical simulations on the microdynamics of ice with air inclusions as a second phase. Our aim was to investigate the rheological effects of air inclusions and explain the onset of dynamic recrystallization in the permeable firn. The simulations employ a full-field theory crystal plas...
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ftcopernicus:oai:publications.copernicus.org:tc53565 2023-05-15T13:54:27+02:00 Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study Steinbach, Florian Bons, Paul D. Griera, Albert Jansen, Daniela Llorens, Maria-Gema Roessiger, Jens Weikusat, Ilka 2018-09-27 application/pdf https://doi.org/10.5194/tc-10-3071-2016 https://tc.copernicus.org/articles/10/3071/2016/ eng eng doi:10.5194/tc-10-3071-2016 https://tc.copernicus.org/articles/10/3071/2016/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-10-3071-2016 2020-07-20T16:23:54Z We performed numerical simulations on the microdynamics of ice with air inclusions as a second phase. Our aim was to investigate the rheological effects of air inclusions and explain the onset of dynamic recrystallization in the permeable firn. The simulations employ a full-field theory crystal plasticity code coupled to codes simulating dynamic recrystallization processes and predict time-resolved microstructure evolution in terms of lattice orientations, strain distribution, grain sizes and grain-boundary network. Results show heterogeneous deformation throughout the simulations and indicate the importance of strain localization controlled by air inclusions. This strain localization gives rise to locally increased energies that drive dynamic recrystallization and induce heterogeneous microstructures that are coherent with natural firn microstructures from EPICA Dronning Maud Land ice coring site in Antarctica. We conclude that although overall strains and stresses in firn are low, strain localization associated with locally increased strain energies can explain the occurrence of dynamic recrystallization. Text Antarc* Antarctica Dronning Maud Land EPICA Copernicus Publications: E-Journals Dronning Maud Land The Cryosphere 10 6 3071 3089 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We performed numerical simulations on the microdynamics of ice with air inclusions as a second phase. Our aim was to investigate the rheological effects of air inclusions and explain the onset of dynamic recrystallization in the permeable firn. The simulations employ a full-field theory crystal plasticity code coupled to codes simulating dynamic recrystallization processes and predict time-resolved microstructure evolution in terms of lattice orientations, strain distribution, grain sizes and grain-boundary network. Results show heterogeneous deformation throughout the simulations and indicate the importance of strain localization controlled by air inclusions. This strain localization gives rise to locally increased energies that drive dynamic recrystallization and induce heterogeneous microstructures that are coherent with natural firn microstructures from EPICA Dronning Maud Land ice coring site in Antarctica. We conclude that although overall strains and stresses in firn are low, strain localization associated with locally increased strain energies can explain the occurrence of dynamic recrystallization. |
format |
Text |
author |
Steinbach, Florian Bons, Paul D. Griera, Albert Jansen, Daniela Llorens, Maria-Gema Roessiger, Jens Weikusat, Ilka |
spellingShingle |
Steinbach, Florian Bons, Paul D. Griera, Albert Jansen, Daniela Llorens, Maria-Gema Roessiger, Jens Weikusat, Ilka Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
author_facet |
Steinbach, Florian Bons, Paul D. Griera, Albert Jansen, Daniela Llorens, Maria-Gema Roessiger, Jens Weikusat, Ilka |
author_sort |
Steinbach, Florian |
title |
Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
title_short |
Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
title_full |
Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
title_fullStr |
Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
title_full_unstemmed |
Strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
title_sort |
strain localization and dynamic recrystallization in the ice–air aggregate: a numerical study |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-10-3071-2016 https://tc.copernicus.org/articles/10/3071/2016/ |
geographic |
Dronning Maud Land |
geographic_facet |
Dronning Maud Land |
genre |
Antarc* Antarctica Dronning Maud Land EPICA |
genre_facet |
Antarc* Antarctica Dronning Maud Land EPICA |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-10-3071-2016 https://tc.copernicus.org/articles/10/3071/2016/ |
op_doi |
https://doi.org/10.5194/tc-10-3071-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
6 |
container_start_page |
3071 |
op_container_end_page |
3089 |
_version_ |
1766260330142367744 |