Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams
Large, simply supported beams of temperate lake ice were found, generally, to yield significantly higher flexural strengths than the same beams tested in the cantilever mode. Data support the view that a significant stress concentration may exist at the fixed corners of the cantilever beams. Maximum...
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ftdtic:ADA054218 2023-05-15T16:37:12+02:00 Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams Gow,A J Ueda,H T Ricard,J A COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1978-04 text/html http://www.dtic.mil/docs/citations/ADA054218 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA054218 en eng http://www.dtic.mil/docs/citations/ADA054218 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost *ICE *FLEXURAL STRENGTH CRYSTAL STRUCTURE BEAMS(STRUCTURAL) LAKES STRESS CONCENTRATION WU001 PE61102A AST24 Text 1978 ftdtic 2016-02-20T13:03:46Z Large, simply supported beams of temperate lake ice were found, generally, to yield significantly higher flexural strengths than the same beams tested in the cantilever mode. Data support the view that a significant stress concentration may exist at the fixed corners of the cantilever beams. Maximum effects are experienced with beams of cold, brittle ice substantially free of structural imperfections; for this kind of ice the strength difference factor, here attributed to the effect of stress concentrations, may exceed 2.0; that is, simply supported beams test a factor of 2 or more stronger than the same beams tested in the cantilever mode. In ice that has undergone extensive thermal degradation, the stress concentration effect may be eliminated entirely. Simply supported beams generally yield higher strengths when the top surfaces are placed in tension. This behavior is attributed to differences in ice type; the fine-grained, crack-free top layer of snow-ice which constituted up to 50% of the ice cover in the current series of tests usually reacted more strongly in tension than the coarse-grained crack-prone bottom lake ice. (Author) Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Snow Ice and Permafrost *ICE *FLEXURAL STRENGTH CRYSTAL STRUCTURE BEAMS(STRUCTURAL) LAKES STRESS CONCENTRATION WU001 PE61102A AST24 |
spellingShingle |
Snow Ice and Permafrost *ICE *FLEXURAL STRENGTH CRYSTAL STRUCTURE BEAMS(STRUCTURAL) LAKES STRESS CONCENTRATION WU001 PE61102A AST24 Gow,A J Ueda,H T Ricard,J A Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams |
topic_facet |
Snow Ice and Permafrost *ICE *FLEXURAL STRENGTH CRYSTAL STRUCTURE BEAMS(STRUCTURAL) LAKES STRESS CONCENTRATION WU001 PE61102A AST24 |
description |
Large, simply supported beams of temperate lake ice were found, generally, to yield significantly higher flexural strengths than the same beams tested in the cantilever mode. Data support the view that a significant stress concentration may exist at the fixed corners of the cantilever beams. Maximum effects are experienced with beams of cold, brittle ice substantially free of structural imperfections; for this kind of ice the strength difference factor, here attributed to the effect of stress concentrations, may exceed 2.0; that is, simply supported beams test a factor of 2 or more stronger than the same beams tested in the cantilever mode. In ice that has undergone extensive thermal degradation, the stress concentration effect may be eliminated entirely. Simply supported beams generally yield higher strengths when the top surfaces are placed in tension. This behavior is attributed to differences in ice type; the fine-grained, crack-free top layer of snow-ice which constituted up to 50% of the ice cover in the current series of tests usually reacted more strongly in tension than the coarse-grained crack-prone bottom lake ice. (Author) |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
Gow,A J Ueda,H T Ricard,J A |
author_facet |
Gow,A J Ueda,H T Ricard,J A |
author_sort |
Gow,A J |
title |
Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams |
title_short |
Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams |
title_full |
Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams |
title_fullStr |
Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams |
title_full_unstemmed |
Flexural Strength of Ice on Temperate Lakes: Comparative Tests of Large Cantilever and Simply Supported Beams |
title_sort |
flexural strength of ice on temperate lakes: comparative tests of large cantilever and simply supported beams |
publishDate |
1978 |
url |
http://www.dtic.mil/docs/citations/ADA054218 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA054218 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA054218 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027495119781888 |