Failure strength of glacier ice inferred from Greenland crevasses
Ice fractures when subject to stress that exceeds the material failure strength. Previous studies have found that a von Mises failure criterion, which places a bound on the second invariant of the deviatoric stress tensor, is consistent with empirical data. Other studies have suggested that a scalin...
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00068912 2023-10-09T21:51:45+02:00 Failure strength of glacier ice inferred from Greenland crevasses Grinsted, Aslak Rathmann, Nicholas Mossor Mottram, Ruth Solgaard, Anne Munck Mathiesen, Joachim Hvidberg, Christine Schøtt 2023-09 electronic https://doi.org/10.5194/egusphere-2023-1957 https://noa.gwlb.de/receive/cop_mods_00068912 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067321/egusphere-2023-1957.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1957/egusphere-2023-1957.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-1957 https://noa.gwlb.de/receive/cop_mods_00068912 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067321/egusphere-2023-1957.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1957/egusphere-2023-1957.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-1957 2023-09-24T23:21:37Z Ice fractures when subject to stress that exceeds the material failure strength. Previous studies have found that a von Mises failure criterion, which places a bound on the second invariant of the deviatoric stress tensor, is consistent with empirical data. Other studies have suggested that a scaling effect exists, such that larger sample specimens have a substantially lower failure strength, implying that estimating material strength from laboratory-scale experiments may be insufficient for glacier-scale modelling. In this paper, we analyze the stress conditions in crevasse onset regions to better understand the failure criterion and strength relevant for large-scale modelling. The local deviatoric stress is inferred using surface velocities and reanalysis temperatures, and crevasse onset regions are extracted from a remotely sensed crevasse density map. We project the stress state onto the failure plane spanned by Haigh–Westergaard coordinates, showing how failure depends on mode of stress. We find that existing crevasse data is consistent with a Schmidt–Ishlinsky failure criterion that places a bound on the absolute value of the maximal principal deviatoric stress, estimated to be (158 ± 44) kPa. Although the traditional von Mises failure criterion also provides an adequate fit to the data with a von Mises strength of (265 ± 73) kPa, it depends only on stress magnitude and is indifferent to the specific stress state, unlike Schmidt–Ishlinsky failure which has a larger shear failure strength compared to tensile strength. Implications for large-scale ice-flow and fracture modelling are discussed. Article in Journal/Newspaper glacier Greenland Niedersächsisches Online-Archiv NOA Greenland |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Grinsted, Aslak Rathmann, Nicholas Mossor Mottram, Ruth Solgaard, Anne Munck Mathiesen, Joachim Hvidberg, Christine Schøtt Failure strength of glacier ice inferred from Greenland crevasses |
topic_facet |
article Verlagsveröffentlichung |
description |
Ice fractures when subject to stress that exceeds the material failure strength. Previous studies have found that a von Mises failure criterion, which places a bound on the second invariant of the deviatoric stress tensor, is consistent with empirical data. Other studies have suggested that a scaling effect exists, such that larger sample specimens have a substantially lower failure strength, implying that estimating material strength from laboratory-scale experiments may be insufficient for glacier-scale modelling. In this paper, we analyze the stress conditions in crevasse onset regions to better understand the failure criterion and strength relevant for large-scale modelling. The local deviatoric stress is inferred using surface velocities and reanalysis temperatures, and crevasse onset regions are extracted from a remotely sensed crevasse density map. We project the stress state onto the failure plane spanned by Haigh–Westergaard coordinates, showing how failure depends on mode of stress. We find that existing crevasse data is consistent with a Schmidt–Ishlinsky failure criterion that places a bound on the absolute value of the maximal principal deviatoric stress, estimated to be (158 ± 44) kPa. Although the traditional von Mises failure criterion also provides an adequate fit to the data with a von Mises strength of (265 ± 73) kPa, it depends only on stress magnitude and is indifferent to the specific stress state, unlike Schmidt–Ishlinsky failure which has a larger shear failure strength compared to tensile strength. Implications for large-scale ice-flow and fracture modelling are discussed. |
format |
Article in Journal/Newspaper |
author |
Grinsted, Aslak Rathmann, Nicholas Mossor Mottram, Ruth Solgaard, Anne Munck Mathiesen, Joachim Hvidberg, Christine Schøtt |
author_facet |
Grinsted, Aslak Rathmann, Nicholas Mossor Mottram, Ruth Solgaard, Anne Munck Mathiesen, Joachim Hvidberg, Christine Schøtt |
author_sort |
Grinsted, Aslak |
title |
Failure strength of glacier ice inferred from Greenland crevasses |
title_short |
Failure strength of glacier ice inferred from Greenland crevasses |
title_full |
Failure strength of glacier ice inferred from Greenland crevasses |
title_fullStr |
Failure strength of glacier ice inferred from Greenland crevasses |
title_full_unstemmed |
Failure strength of glacier ice inferred from Greenland crevasses |
title_sort |
failure strength of glacier ice inferred from greenland crevasses |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-1957 https://noa.gwlb.de/receive/cop_mods_00068912 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067321/egusphere-2023-1957.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1957/egusphere-2023-1957.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland |
genre_facet |
glacier Greenland |
op_relation |
https://doi.org/10.5194/egusphere-2023-1957 https://noa.gwlb.de/receive/cop_mods_00068912 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067321/egusphere-2023-1957.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1957/egusphere-2023-1957.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-1957 |
_version_ |
1779314863484436480 |