The Influence of Ice-Crystal Size on Creep
Abstract Uniaxial compression tests were conducted on polycrystalline-ice samples with random c -axis orientation and steady-state creep rates were determined. Experiments were conducted on both inclusion-bearing and inclusion-free ice and were run at constant stress and constant temperature. During...
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Language: | English |
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Cambridge University Press (CUP)
1978
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Online Access: | http://dx.doi.org/10.1017/s0022143000033633 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033633 |
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crcambridgeupr:10.1017/s0022143000033633 2024-03-03T08:45:59+00:00 The Influence of Ice-Crystal Size on Creep Baker, Robert W. 1978 http://dx.doi.org/10.1017/s0022143000033633 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033633 en eng Cambridge University Press (CUP) Journal of Glaciology volume 21, issue 85, page 485-500 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1978 crcambridgeupr https://doi.org/10.1017/s0022143000033633 2024-02-08T08:34:04Z Abstract Uniaxial compression tests were conducted on polycrystalline-ice samples with random c -axis orientation and steady-state creep rates were determined. Experiments were conducted on both inclusion-bearing and inclusion-free ice and were run at constant stress and constant temperature. During freezing, the presence of inclusions in low concentrations inhibits crystal growth; variations in the volume-fraction of inclusions thus result in variations in ice-crystal size. The creep rate of polycrystalline ice at high temperatures and moderate stresses is extremely sensitive to variations in ice-crystal size. Due to an apparent inversion between dislocation-controlled creep and diffusion-controlled creep, the optimum grain size for creep resistance is about 1.0 mm. Increasing or decreasing the average crystal size from this critical value results in an increase in secondary-creep rate. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 21 85 485 500 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Baker, Robert W. The Influence of Ice-Crystal Size on Creep |
topic_facet |
Earth-Surface Processes |
description |
Abstract Uniaxial compression tests were conducted on polycrystalline-ice samples with random c -axis orientation and steady-state creep rates were determined. Experiments were conducted on both inclusion-bearing and inclusion-free ice and were run at constant stress and constant temperature. During freezing, the presence of inclusions in low concentrations inhibits crystal growth; variations in the volume-fraction of inclusions thus result in variations in ice-crystal size. The creep rate of polycrystalline ice at high temperatures and moderate stresses is extremely sensitive to variations in ice-crystal size. Due to an apparent inversion between dislocation-controlled creep and diffusion-controlled creep, the optimum grain size for creep resistance is about 1.0 mm. Increasing or decreasing the average crystal size from this critical value results in an increase in secondary-creep rate. |
format |
Article in Journal/Newspaper |
author |
Baker, Robert W. |
author_facet |
Baker, Robert W. |
author_sort |
Baker, Robert W. |
title |
The Influence of Ice-Crystal Size on Creep |
title_short |
The Influence of Ice-Crystal Size on Creep |
title_full |
The Influence of Ice-Crystal Size on Creep |
title_fullStr |
The Influence of Ice-Crystal Size on Creep |
title_full_unstemmed |
The Influence of Ice-Crystal Size on Creep |
title_sort |
influence of ice-crystal size on creep |
publisher |
Cambridge University Press (CUP) |
publishDate |
1978 |
url |
http://dx.doi.org/10.1017/s0022143000033633 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033633 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 21, issue 85, page 485-500 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000033633 |
container_title |
Journal of Glaciology |
container_volume |
21 |
container_issue |
85 |
container_start_page |
485 |
op_container_end_page |
500 |
_version_ |
1792501734282625024 |