Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System.
Tensile strength envelopes were developed for horizontally and vertically oriented specimens of saline ice. The upper boundary limit in each case represents 1- to 2-ppt salinity ice for temperature range -4C to -27C, while the lower boundary represents 7- to 9-ppt salinity ice for the same temperatu...
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ftdtic:AD0874807 2023-05-15T13:59:40+02:00 Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. Dykins, J. E. NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA 1970-07 text/html http://www.dtic.mil/docs/citations/AD0874807 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0874807 en eng http://www.dtic.mil/docs/citations/AD0874807 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Mechanics (*SEA ICE TENSILE PROPERTIES) CRYSTAL STRUCTURE SALINITY DENSITY STRUCTURAL PROPERTIES THICKNESS FLEXURAL STRENGTH MODULUS OF ELASTICITY CREEP SHEAR STRESSES NAVAL OPERATIONS ARCTIC REGIONS ANTARCTIC REGIONS *ICE ENGINEERING SEA ICE BREAKTHROUGH Text 1970 ftdtic 2016-02-19T06:22:25Z Tensile strength envelopes were developed for horizontally and vertically oriented specimens of saline ice. The upper boundary limit in each case represents 1- to 2-ppt salinity ice for temperature range -4C to -27C, while the lower boundary represents 7- to 9-ppt salinity ice for the same temperature. The salinity, density, and petrographic structure of the 7- to 9-ppt natural seawater ice, which was grown in the laboratory, are closely identifiable with the characteristics of sea ice formed in a natural environment. This observation was based on comparison of the upper 44 cm of laboratory ice with a similar thickness of natural sea ice. The tensile strength was found to be a nonlinear function of temperature; there were strong implications, however, that a linear relationship with salinity may exist. The strength was found to be dependent on orientation of the stress field with both the grain (crystal) and subgrain (platelet) structure. Limited study indicates that the tensile strength of saline ice is appreciably reduced as stress rates increase above 25 psi/sec. (Author) Text Antarc* Antarctic Arctic Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database Antarctic Arctic Psi ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Mechanics (*SEA ICE TENSILE PROPERTIES) CRYSTAL STRUCTURE SALINITY DENSITY STRUCTURAL PROPERTIES THICKNESS FLEXURAL STRENGTH MODULUS OF ELASTICITY CREEP SHEAR STRESSES NAVAL OPERATIONS ARCTIC REGIONS ANTARCTIC REGIONS *ICE ENGINEERING SEA ICE BREAKTHROUGH |
spellingShingle |
Snow Ice and Permafrost Mechanics (*SEA ICE TENSILE PROPERTIES) CRYSTAL STRUCTURE SALINITY DENSITY STRUCTURAL PROPERTIES THICKNESS FLEXURAL STRENGTH MODULUS OF ELASTICITY CREEP SHEAR STRESSES NAVAL OPERATIONS ARCTIC REGIONS ANTARCTIC REGIONS *ICE ENGINEERING SEA ICE BREAKTHROUGH Dykins, J. E. Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. |
topic_facet |
Snow Ice and Permafrost Mechanics (*SEA ICE TENSILE PROPERTIES) CRYSTAL STRUCTURE SALINITY DENSITY STRUCTURAL PROPERTIES THICKNESS FLEXURAL STRENGTH MODULUS OF ELASTICITY CREEP SHEAR STRESSES NAVAL OPERATIONS ARCTIC REGIONS ANTARCTIC REGIONS *ICE ENGINEERING SEA ICE BREAKTHROUGH |
description |
Tensile strength envelopes were developed for horizontally and vertically oriented specimens of saline ice. The upper boundary limit in each case represents 1- to 2-ppt salinity ice for temperature range -4C to -27C, while the lower boundary represents 7- to 9-ppt salinity ice for the same temperature. The salinity, density, and petrographic structure of the 7- to 9-ppt natural seawater ice, which was grown in the laboratory, are closely identifiable with the characteristics of sea ice formed in a natural environment. This observation was based on comparison of the upper 44 cm of laboratory ice with a similar thickness of natural sea ice. The tensile strength was found to be a nonlinear function of temperature; there were strong implications, however, that a linear relationship with salinity may exist. The strength was found to be dependent on orientation of the stress field with both the grain (crystal) and subgrain (platelet) structure. Limited study indicates that the tensile strength of saline ice is appreciably reduced as stress rates increase above 25 psi/sec. (Author) |
author2 |
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA |
format |
Text |
author |
Dykins, J. E. |
author_facet |
Dykins, J. E. |
author_sort |
Dykins, J. E. |
title |
Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. |
title_short |
Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. |
title_full |
Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. |
title_fullStr |
Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. |
title_full_unstemmed |
Ice Engineering - Tensile Properties of Sea Ice Grown in a Confined System. |
title_sort |
ice engineering - tensile properties of sea ice grown in a confined system. |
publishDate |
1970 |
url |
http://www.dtic.mil/docs/citations/AD0874807 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0874807 |
long_lat |
ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
geographic |
Antarctic Arctic Psi |
geographic_facet |
Antarctic Arctic Psi |
genre |
Antarc* Antarctic Arctic Ice permafrost Sea ice |
genre_facet |
Antarc* Antarctic Arctic Ice permafrost Sea ice |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0874807 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766268335233695744 |