Rheology of discrete failure regimes of anisotropic sea ice
A rheological model of sea ice is presented that incorporates the orientational distribution of ice thickness in leads embedded in isotropic floe ice. Sea ice internal stress is determined by coulombic, ridging and tensile failure at orientations where corresponding failure criteria are satisfied at...
Published in: | Journal of Physical Oceanography |
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Language: | English |
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American Meteorological Society
2012
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Online Access: | https://centaur.reading.ac.uk/34580/ https://centaur.reading.ac.uk/34580/1/jpo-d-11-0178.1.pdf |
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ftunivreading:oai:centaur.reading.ac.uk:34580 2024-06-23T07:50:38+00:00 Rheology of discrete failure regimes of anisotropic sea ice Wilchinsky, Alexander V. Feltham, Daniel L. 2012-07 text https://centaur.reading.ac.uk/34580/ https://centaur.reading.ac.uk/34580/1/jpo-d-11-0178.1.pdf en eng American Meteorological Society https://centaur.reading.ac.uk/34580/1/jpo-d-11-0178.1.pdf Wilchinsky, A. V. and Feltham, D. L. <https://centaur.reading.ac.uk/view/creators/90004991.html> orcid:0000-0003-2289-014X (2012) Rheology of discrete failure regimes of anisotropic sea ice. Journal of Physical Oceanography, 42 (7). pp. 1065-1082. ISSN 1520-0485 doi: https://doi.org/10.1175/JPO-D-11-0178.1 <https://doi.org/10.1175/JPO-D-11-0178.1> Article PeerReviewed 2012 ftunivreading https://doi.org/10.1175/JPO-D-11-0178.1 2024-06-11T15:01:09Z A rheological model of sea ice is presented that incorporates the orientational distribution of ice thickness in leads embedded in isotropic floe ice. Sea ice internal stress is determined by coulombic, ridging and tensile failure at orientations where corresponding failure criteria are satisfied at minimum stresses. Because sea ice traction increases in thinner leads and cohesion is finite, such failure line angles are determined by the orientational distribution of sea ice thickness relative to the imposed stresses. In contrast to the isotropic case, sea ice thickness anisotropy results in these failure lines becoming dependent on the stress magnitude. Although generally a given failure criteria type can be satisfied at many directions, only two at most are considered. The strain rate is determined by shearing along slip lines accompanied by dilatancy and closing or opening across orientations affected by ridging or tensile failure. The rheology is illustrated by a yield curve determined by combining coulombic and ridging failure for the case of two pairs of isotropically formed leads of different thicknesses rotated with regard to each other, which models two events of coulombic failure followed by dilatancy and refreezing. The yield curve consists of linear segments describing coulombic and ridging yield as failure switches from one lead to another as the stress grows. Because sliding along slip lines is accompanied by dilatancy, at typical Arctic sea ice deformation rates a one-day-long deformation event produces enough open water that these freshly formed slip lines are preferential places of ridging failure. Article in Journal/Newspaper Arctic Sea ice CentAUR: Central Archive at the University of Reading Arctic Journal of Physical Oceanography 42 7 1065 1082 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
A rheological model of sea ice is presented that incorporates the orientational distribution of ice thickness in leads embedded in isotropic floe ice. Sea ice internal stress is determined by coulombic, ridging and tensile failure at orientations where corresponding failure criteria are satisfied at minimum stresses. Because sea ice traction increases in thinner leads and cohesion is finite, such failure line angles are determined by the orientational distribution of sea ice thickness relative to the imposed stresses. In contrast to the isotropic case, sea ice thickness anisotropy results in these failure lines becoming dependent on the stress magnitude. Although generally a given failure criteria type can be satisfied at many directions, only two at most are considered. The strain rate is determined by shearing along slip lines accompanied by dilatancy and closing or opening across orientations affected by ridging or tensile failure. The rheology is illustrated by a yield curve determined by combining coulombic and ridging failure for the case of two pairs of isotropically formed leads of different thicknesses rotated with regard to each other, which models two events of coulombic failure followed by dilatancy and refreezing. The yield curve consists of linear segments describing coulombic and ridging yield as failure switches from one lead to another as the stress grows. Because sliding along slip lines is accompanied by dilatancy, at typical Arctic sea ice deformation rates a one-day-long deformation event produces enough open water that these freshly formed slip lines are preferential places of ridging failure. |
format |
Article in Journal/Newspaper |
author |
Wilchinsky, Alexander V. Feltham, Daniel L. |
spellingShingle |
Wilchinsky, Alexander V. Feltham, Daniel L. Rheology of discrete failure regimes of anisotropic sea ice |
author_facet |
Wilchinsky, Alexander V. Feltham, Daniel L. |
author_sort |
Wilchinsky, Alexander V. |
title |
Rheology of discrete failure regimes of anisotropic sea ice |
title_short |
Rheology of discrete failure regimes of anisotropic sea ice |
title_full |
Rheology of discrete failure regimes of anisotropic sea ice |
title_fullStr |
Rheology of discrete failure regimes of anisotropic sea ice |
title_full_unstemmed |
Rheology of discrete failure regimes of anisotropic sea ice |
title_sort |
rheology of discrete failure regimes of anisotropic sea ice |
publisher |
American Meteorological Society |
publishDate |
2012 |
url |
https://centaur.reading.ac.uk/34580/ https://centaur.reading.ac.uk/34580/1/jpo-d-11-0178.1.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
https://centaur.reading.ac.uk/34580/1/jpo-d-11-0178.1.pdf Wilchinsky, A. V. and Feltham, D. L. <https://centaur.reading.ac.uk/view/creators/90004991.html> orcid:0000-0003-2289-014X (2012) Rheology of discrete failure regimes of anisotropic sea ice. Journal of Physical Oceanography, 42 (7). pp. 1065-1082. ISSN 1520-0485 doi: https://doi.org/10.1175/JPO-D-11-0178.1 <https://doi.org/10.1175/JPO-D-11-0178.1> |
op_doi |
https://doi.org/10.1175/JPO-D-11-0178.1 |
container_title |
Journal of Physical Oceanography |
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42 |
container_issue |
7 |
container_start_page |
1065 |
op_container_end_page |
1082 |
_version_ |
1802641551492382720 |