ELASTIC PARAMETERS OF SEA ICE

• Main Authors: Langleben, M. P., Pounder, E. R.
• Other Authors: MCGILL UNIV MONTREAL (QUEBEC)
• Format: Text
• Language: English
• Published: 1961
• Subjects: (*ICE; ELASTIC PROPERTIES); SEA WATER; DENSITY; TESTS; VISCOSITY; DEFORMATION; SALINITY; TEMPERATURE; TEST METHODS; ACOUSTIC PROPERTIES; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/AD0452490; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0452490

The elastic behavior of sea ice has been investigated in a variety of ways, including static loading tests on small samples and on ice sheets in situ, dynamic tests on small samples, and seismic studies of ice covers. Because of its viscoelastic nature, ice suffers permanent deformation readily, and the results of static tests usually show great scatter. The most consistent results are obtained from acoustic and seismic methods. Anderson (3) has reviewed the various methods and attempted to relate the values of Young's modulus E found by various workers with the brine content nu of the ice. Brine content is the fraction of the volume of the ice occupied by liquid brine or air. It is calculable from a knowledge of the salinity, temperature, and density, and in fact, if the volume of entrapped air is negligible, it is a unique function of salinity and temperature. Anderson showed that E decreases with increasing brine content, but the data were too few to determine the form of the function. Results to be given in this paper show a fairly good fit for a linear relationship between E and nu for cold ice. A similar linear relation with different coefficients was found for ''warm'' polar ice. (Author)