On the physical basis for the creep of ice: the high temperature regime
This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics. An analysis of quasistatic and dynamic cyclic loading data for several ice types leads to the conclusion that high temperature (e.g. T...
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Cambridge University Press
2020
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ftdoajarticles:oai:doaj.org/article:9df8a7d51d294cb59e064b32a249f6fd 2023-05-15T16:57:36+02:00 On the physical basis for the creep of ice: the high temperature regime D.M. Cole 2020-06-01T00:00:00Z https://doi.org/10.1017/jog.2020.15 https://doaj.org/article/9df8a7d51d294cb59e064b32a249f6fd EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143020000155/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.15 0022-1430 1727-5652 https://doaj.org/article/9df8a7d51d294cb59e064b32a249f6fd Journal of Glaciology, Vol 66, Pp 401-414 (2020) Ice dynamics ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/jog.2020.15 2023-03-12T01:30:57Z This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics. An analysis of quasistatic and dynamic cyclic loading data for several ice types leads to the conclusion that high temperature (e.g. T ≥ −8°C) behavior is the result of a thermally induced increase in the number of mobile dislocations rather than an increase in the activation energy of dislocation glide or the introduction of a new deformation mechanism. The relationship between dislocation density and temperature is quantified and the model is shown to adequately represent the published minimum creep rate vs stress data for isotropic granular freshwater ice for −48 ≤ T ≤ −0.01°C. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 66 257 401 414 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice dynamics ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Ice dynamics ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 D.M. Cole On the physical basis for the creep of ice: the high temperature regime |
topic_facet |
Ice dynamics ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics. An analysis of quasistatic and dynamic cyclic loading data for several ice types leads to the conclusion that high temperature (e.g. T ≥ −8°C) behavior is the result of a thermally induced increase in the number of mobile dislocations rather than an increase in the activation energy of dislocation glide or the introduction of a new deformation mechanism. The relationship between dislocation density and temperature is quantified and the model is shown to adequately represent the published minimum creep rate vs stress data for isotropic granular freshwater ice for −48 ≤ T ≤ −0.01°C. |
format |
Article in Journal/Newspaper |
author |
D.M. Cole |
author_facet |
D.M. Cole |
author_sort |
D.M. Cole |
title |
On the physical basis for the creep of ice: the high temperature regime |
title_short |
On the physical basis for the creep of ice: the high temperature regime |
title_full |
On the physical basis for the creep of ice: the high temperature regime |
title_fullStr |
On the physical basis for the creep of ice: the high temperature regime |
title_full_unstemmed |
On the physical basis for the creep of ice: the high temperature regime |
title_sort |
on the physical basis for the creep of ice: the high temperature regime |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2020.15 https://doaj.org/article/9df8a7d51d294cb59e064b32a249f6fd |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 66, Pp 401-414 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143020000155/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.15 0022-1430 1727-5652 https://doaj.org/article/9df8a7d51d294cb59e064b32a249f6fd |
op_doi |
https://doi.org/10.1017/jog.2020.15 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
257 |
container_start_page |
401 |
op_container_end_page |
414 |
_version_ |
1766049165467451392 |