RING TENSILE STRENGTH OF SEA ICE
A floating ice sheet, when loaded beyond its bearing capacity, should break under tension. The last decade or so has there-fore seen considerable effort devoted to so-called largescale tests of ultimate tensile strength. An in situ cantilever beam test, for instance, involves the making of two paral...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
| Published: |
1963
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| Subjects: | |
| Online Access: | http://www.dtic.mil/docs/citations/AD0452492 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0452492 |
| Summary: | A floating ice sheet, when loaded beyond its bearing capacity, should break under tension. The last decade or so has there-fore seen considerable effort devoted to so-called largescale tests of ultimate tensile strength. An in situ cantilever beam test, for instance, involves the making of two parallel cuts at the sides of the beam and another cut at its free end. The beam is then loaded at its free end at a rapid rate until failure occurs. When the ice sheet is more than a few inches thick, and many of these tests have been carried out on ice up to 6 feet thick, an effort of considerable magnitude is required. Hence, one finds these tests being performed solely by government agencies that have the necessary manpower and facilities. Results are further-more not as reproducible as one would like, being influenced by flaws or weak points that are invariably present in large samples. Even under the best of circumstances, since a sheet of sea ice will, in general, have its salinity and temperature, and hence its brine content, varying with depth, the data can be related only to the gross features of the ice. Small-scale tests, on the other hand, can be performed with relative ease and rapidity, particularly if a procedure that is becoming standard is adopted. This is a test of ultimate ring tensile strength, and the procedure is described in detail by Butkovich. (Author) |
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