Strengthening of columnar-grained freshwater ice through cyclic flexural loading
Systematic experiments reveal that the flexural strength of freshwater S2 columnar-grained ice loaded normal to the columns increases upon cyclic loading. Specifically, over the range of stress amplitudes 0.1–2.6 MPa the flexural strength increases linearly with increasing stress amplitude. The expe...
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Cambridge University Press
2020
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ftdoajarticles:oai:doaj.org/article:3cdb39a91e0b441fa2992d7ed80d42bf 2023-05-15T16:57:33+02:00 Strengthening of columnar-grained freshwater ice through cyclic flexural loading Andrii Murdza Erland M. Schulson Carl E. Renshaw 2020-08-01T00:00:00Z https://doi.org/10.1017/jog.2020.31 https://doaj.org/article/3cdb39a91e0b441fa2992d7ed80d42bf EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143020000313/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.31 0022-1430 1727-5652 https://doaj.org/article/3cdb39a91e0b441fa2992d7ed80d42bf Journal of Glaciology, Vol 66, Pp 556-566 (2020) Ice engineering ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/jog.2020.31 2023-03-12T01:30:57Z Systematic experiments reveal that the flexural strength of freshwater S2 columnar-grained ice loaded normal to the columns increases upon cyclic loading. Specifically, over the range of stress amplitudes 0.1–2.6 MPa the flexural strength increases linearly with increasing stress amplitude. The experiments were conducted upon both reversed and non-reversed cyclic loading over ranges of frequencies from 0.03 to 2 Hz and temperatures from −25 to −3°C. Strengthening can also be imparted through bending-induced creep. The fundamental requirement for strengthening is that the surface that undergoes maximum tensile stress during failure must have been pre-stressed in tension. Flexural strength is governed by crack nucleation. We suggest that the process is resisted by an internal back-stress that opposes the applied stress and builds up through either crystal dislocations piling up or grain boundaries sliding. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 66 258 556 566 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice engineering ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Ice engineering ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Andrii Murdza Erland M. Schulson Carl E. Renshaw Strengthening of columnar-grained freshwater ice through cyclic flexural loading |
topic_facet |
Ice engineering ice physics ice rheology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Systematic experiments reveal that the flexural strength of freshwater S2 columnar-grained ice loaded normal to the columns increases upon cyclic loading. Specifically, over the range of stress amplitudes 0.1–2.6 MPa the flexural strength increases linearly with increasing stress amplitude. The experiments were conducted upon both reversed and non-reversed cyclic loading over ranges of frequencies from 0.03 to 2 Hz and temperatures from −25 to −3°C. Strengthening can also be imparted through bending-induced creep. The fundamental requirement for strengthening is that the surface that undergoes maximum tensile stress during failure must have been pre-stressed in tension. Flexural strength is governed by crack nucleation. We suggest that the process is resisted by an internal back-stress that opposes the applied stress and builds up through either crystal dislocations piling up or grain boundaries sliding. |
format |
Article in Journal/Newspaper |
author |
Andrii Murdza Erland M. Schulson Carl E. Renshaw |
author_facet |
Andrii Murdza Erland M. Schulson Carl E. Renshaw |
author_sort |
Andrii Murdza |
title |
Strengthening of columnar-grained freshwater ice through cyclic flexural loading |
title_short |
Strengthening of columnar-grained freshwater ice through cyclic flexural loading |
title_full |
Strengthening of columnar-grained freshwater ice through cyclic flexural loading |
title_fullStr |
Strengthening of columnar-grained freshwater ice through cyclic flexural loading |
title_full_unstemmed |
Strengthening of columnar-grained freshwater ice through cyclic flexural loading |
title_sort |
strengthening of columnar-grained freshwater ice through cyclic flexural loading |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2020.31 https://doaj.org/article/3cdb39a91e0b441fa2992d7ed80d42bf |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 66, Pp 556-566 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143020000313/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.31 0022-1430 1727-5652 https://doaj.org/article/3cdb39a91e0b441fa2992d7ed80d42bf |
op_doi |
https://doi.org/10.1017/jog.2020.31 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
258 |
container_start_page |
556 |
op_container_end_page |
566 |
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1766049107839811584 |