Author(s): R. Frederking; D. Sudom
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Abstract: Medium Scale Field Indentation tests on multi-year ice at Hobson’s Choice Ice Island in 1990 were examined and local ice pressure distributions determined. Maximum loads of about 10 MN on contact areas of about 1 m2 were generated in a loading time of 1 to 2 s on multi-year ice. Local pressures of the order of 60 MPa were measured on areas of 0.003 m2 and less. For areas in the range 0.003 m2 to 0.1 m2, the upper bound to local ice pressures is described by the equation Ps = 8A-0.35 where Ps is local pressure in MPa and A is local area, in m2, over which the local pressure is averaged. This local pressure-area relation is consistent with pressure-area relations for larger areas. Over the time range of the tests spatial distributions of local pressure were relatively stable, however some high pressure areas were observed to move from one area to another during the test period. The size of these high pressure areas was from 0.01 m2 to 0.03 m2.
Year: 2008