Effect of shear rupture on aggregate scale formation in sea ice
A discrete element model is used to study shear rupture of sea ice under convergent wind stresses. The model includes compressive, tensile, and shear rupture of viscous elastic joints connecting floes that move under the action of the wind stresses. The adopted shear rupture is governed by Coulomb’s...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2010
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/11795/ https://nora.nerc.ac.uk/id/eprint/11795/1/jgrc11646.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2009JC006043 |
id |
ftnerc:oai:nora.nerc.ac.uk:11795 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:11795 2023-05-15T16:39:32+02:00 Effect of shear rupture on aggregate scale formation in sea ice Wilchinsky, Alexander V. Feltham, Daniel L. Hopkins, Mark A. 2010-10 text http://nora.nerc.ac.uk/id/eprint/11795/ https://nora.nerc.ac.uk/id/eprint/11795/1/jgrc11646.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2009JC006043 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/11795/1/jgrc11646.pdf Wilchinsky, Alexander V.; Feltham, Daniel L.; Hopkins, Mark A. 2010 Effect of shear rupture on aggregate scale formation in sea ice. Journal of Geophysical Research, 115 (C10), C10002. 13, pp. https://doi.org/10.1029/2009JC006043 <https://doi.org/10.1029/2009JC006043> Marine Sciences Meteorology and Climatology Glaciology Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1029/2009JC006043 2023-02-04T19:27:34Z A discrete element model is used to study shear rupture of sea ice under convergent wind stresses. The model includes compressive, tensile, and shear rupture of viscous elastic joints connecting floes that move under the action of the wind stresses. The adopted shear rupture is governed by Coulomb’s criterion. The ice pack is a 400 km long square domain consisting of 4 km size floes. In the standard case with tensile strength 10 times smaller than the compressive strength, under uniaxial compression the failure regime is mainly shear rupture with the most probable scenario corresponding to that with the minimum failure work. The orientation of cracks delineating formed aggregates is bimodal with the peaks around the angles given by the wing crack theory determining diamond-shaped blocks. The ice block (floe aggregate) size decreases as the wind stress gradient increases since the elastic strain energy grows faster leading to a higher speed of crack propagation. As the tensile strength grows, shear rupture becomes harder to attain and compressive failure becomes equally important leading to elongation of blocks perpendicular to the compression direction and the blocks grow larger. In the standard case, as the wind stress confinement ratio increases the failure mode changes at a confinement ratio within 0.2–0.4, which corresponds to the analytical critical confinement ratio of 0.32. Below this value, the cracks are bimodal delineating diamond shape aggregates, while above this value failure becomes isotropic and is determined by small-scale stress anomalies due to irregularities in floe shape. Article in Journal/Newspaper ice pack Sea ice Natural Environment Research Council: NERC Open Research Archive Journal of Geophysical Research: Oceans 115 C10 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences Meteorology and Climatology Glaciology |
spellingShingle |
Marine Sciences Meteorology and Climatology Glaciology Wilchinsky, Alexander V. Feltham, Daniel L. Hopkins, Mark A. Effect of shear rupture on aggregate scale formation in sea ice |
topic_facet |
Marine Sciences Meteorology and Climatology Glaciology |
description |
A discrete element model is used to study shear rupture of sea ice under convergent wind stresses. The model includes compressive, tensile, and shear rupture of viscous elastic joints connecting floes that move under the action of the wind stresses. The adopted shear rupture is governed by Coulomb’s criterion. The ice pack is a 400 km long square domain consisting of 4 km size floes. In the standard case with tensile strength 10 times smaller than the compressive strength, under uniaxial compression the failure regime is mainly shear rupture with the most probable scenario corresponding to that with the minimum failure work. The orientation of cracks delineating formed aggregates is bimodal with the peaks around the angles given by the wing crack theory determining diamond-shaped blocks. The ice block (floe aggregate) size decreases as the wind stress gradient increases since the elastic strain energy grows faster leading to a higher speed of crack propagation. As the tensile strength grows, shear rupture becomes harder to attain and compressive failure becomes equally important leading to elongation of blocks perpendicular to the compression direction and the blocks grow larger. In the standard case, as the wind stress confinement ratio increases the failure mode changes at a confinement ratio within 0.2–0.4, which corresponds to the analytical critical confinement ratio of 0.32. Below this value, the cracks are bimodal delineating diamond shape aggregates, while above this value failure becomes isotropic and is determined by small-scale stress anomalies due to irregularities in floe shape. |
format |
Article in Journal/Newspaper |
author |
Wilchinsky, Alexander V. Feltham, Daniel L. Hopkins, Mark A. |
author_facet |
Wilchinsky, Alexander V. Feltham, Daniel L. Hopkins, Mark A. |
author_sort |
Wilchinsky, Alexander V. |
title |
Effect of shear rupture on aggregate scale formation in sea ice |
title_short |
Effect of shear rupture on aggregate scale formation in sea ice |
title_full |
Effect of shear rupture on aggregate scale formation in sea ice |
title_fullStr |
Effect of shear rupture on aggregate scale formation in sea ice |
title_full_unstemmed |
Effect of shear rupture on aggregate scale formation in sea ice |
title_sort |
effect of shear rupture on aggregate scale formation in sea ice |
publisher |
American Geophysical Union |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/11795/ https://nora.nerc.ac.uk/id/eprint/11795/1/jgrc11646.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2009JC006043 |
genre |
ice pack Sea ice |
genre_facet |
ice pack Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/11795/1/jgrc11646.pdf Wilchinsky, Alexander V.; Feltham, Daniel L.; Hopkins, Mark A. 2010 Effect of shear rupture on aggregate scale formation in sea ice. Journal of Geophysical Research, 115 (C10), C10002. 13, pp. https://doi.org/10.1029/2009JC006043 <https://doi.org/10.1029/2009JC006043> |
op_doi |
https://doi.org/10.1029/2009JC006043 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
115 |
container_issue |
C10 |
_version_ |
1766029868201410560 |