MECHANICAL PROPERTIES OF SEA ICE WITH REFERENCE TO STRUCTURAL BEHAVIOR OF ICE SHEETS.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A phenomenological approach must be followed in studying the mechanical behavior of sea ice. The material should be first studied at the level of the solid continuum before considering the behavioral contributions from defects and impurities in the structure as well as grain boundary interference. Experimental evidence suggests that the mechanical behavior of sea ice is quite similar to other solids at near-melting temperature. A reasonable starting point for developing constitutive equations for the mechanical behavior of sea ice would be the fundamental theories advanced in the research of metals at elevated temperatures. In some areas, the advanced theory appears to be adaptable to the study of mechanical behavior of sea ice, while in others, constitutive equations will have to be developed. Emphasis is needed in researching the problems of short-term behavior, long-time creep and parametric effects of temperature, age and brine content on strength, as well as repeated loading and cumulative damage. A major effort is needed to develop basic data on behavior of sea ice in simple bending and bending under 2- and possibly 3-dimensional states of stress. This includes investigation of mechanical behavior of small beams, model ice sheets, and the in situ condition. Author