Author(s): M. O. Jeffries; W. M. Sackinger; R. M. W. Frederking; G. W. Timco
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Abstract: Data are presented on ice salinity, density, grain size and morphology, uniaxial compressive strength and failure modulus for old sea and brackish ice specimens from Ward Hunt Ice Shelf, Ellesmere Island, Canada. Brackish ice mean salinity (0.3ppt) is an order of magnitude less than that of sea ice (1.59ppt), and brackish ice structure is much more variable than sea ice. At a nominal strain rate of 1 x 10-5 s-1 ice strength and failure modulus range from 1.7 to 8.9 MPa and 0.9 to 2.6 GPa respectively. At a nominal strain rate of 1 x 10-3 s-1 ice strength and failure modulus range from 3-8 to 15.0 MPa and 1.1 to 8.3 GPa respectively. The sea ice specimens have higher strength values than the brackish ice specimens, and the ice strength and failure modulus do not appear to differ significantly from "modern" ice. The physical-structural properties of the sea and brackish ice are discussed with respect to their differing mechanical properties, and the validity of comparing ice that differs significantly in age.
Year: 1988