The Creep Activation Energies of Ice
Abstract Monocrystals and bicrystals of ice have been creep tested at temperatures between 4 and — 30°C. The bicrystals had a single grain boundary running parallel to the tensile axis; this configuration inhibited grain-boundary slip between the two grains. The creep tests, which were carried out a...
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Cambridge University Press (CUP)
1978
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Online Access: | http://dx.doi.org/10.1017/s0022143000033591 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033591 |
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crcambridgeupr:10.1017/s0022143000033591 2024-04-07T07:53:42+00:00 The Creep Activation Energies of Ice Homer, D. R. Glen, J. W. 1978 http://dx.doi.org/10.1017/s0022143000033591 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033591 en eng Cambridge University Press (CUP) Journal of Glaciology volume 21, issue 85, page 429-444 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1978 crcambridgeupr https://doi.org/10.1017/s0022143000033591 2024-03-08T00:36:34Z Abstract Monocrystals and bicrystals of ice have been creep tested at temperatures between 4 and — 30°C. The bicrystals had a single grain boundary running parallel to the tensile axis; this configuration inhibited grain-boundary slip between the two grains. The creep tests, which were carried out at constant stress σ and temperature T , yielded data of strain ϵ for time elapsed since the start of the test. These data showed accelerating creep for both monocrystals and bicrystals at all strain levels. Strain-rates were derived at strains of 0.01, 0.05. and 0.10, and these rates were fitted to the expression k is Boltzmann’s constant and E is the creep activation energy. Derived values of n were 1.9 for monocrystals and 2.9 for bicrystals. The creep activation energy was found to be 78 kJ/mol for monocrystals and 75 kJ/mol for bicrystals. The processes of creep deformation in mono-, bi- and polycrystals are discussed. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 21 85 429 444 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Homer, D. R. Glen, J. W. The Creep Activation Energies of Ice |
topic_facet |
Earth-Surface Processes |
description |
Abstract Monocrystals and bicrystals of ice have been creep tested at temperatures between 4 and — 30°C. The bicrystals had a single grain boundary running parallel to the tensile axis; this configuration inhibited grain-boundary slip between the two grains. The creep tests, which were carried out at constant stress σ and temperature T , yielded data of strain ϵ for time elapsed since the start of the test. These data showed accelerating creep for both monocrystals and bicrystals at all strain levels. Strain-rates were derived at strains of 0.01, 0.05. and 0.10, and these rates were fitted to the expression k is Boltzmann’s constant and E is the creep activation energy. Derived values of n were 1.9 for monocrystals and 2.9 for bicrystals. The creep activation energy was found to be 78 kJ/mol for monocrystals and 75 kJ/mol for bicrystals. The processes of creep deformation in mono-, bi- and polycrystals are discussed. |
format |
Article in Journal/Newspaper |
author |
Homer, D. R. Glen, J. W. |
author_facet |
Homer, D. R. Glen, J. W. |
author_sort |
Homer, D. R. |
title |
The Creep Activation Energies of Ice |
title_short |
The Creep Activation Energies of Ice |
title_full |
The Creep Activation Energies of Ice |
title_fullStr |
The Creep Activation Energies of Ice |
title_full_unstemmed |
The Creep Activation Energies of Ice |
title_sort |
creep activation energies of ice |
publisher |
Cambridge University Press (CUP) |
publishDate |
1978 |
url |
http://dx.doi.org/10.1017/s0022143000033591 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033591 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 21, issue 85, page 429-444 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000033591 |
container_title |
Journal of Glaciology |
container_volume |
21 |
container_issue |
85 |
container_start_page |
429 |
op_container_end_page |
444 |
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1795669775378022400 |