Localized crushing in ice-structure interaction

Meaney, Richard Benedict (1991) Localized crushing in ice-structure interaction. Masters thesis, Memorial University of Newfoundland.

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Abstract

The National Research Council of Canada conducted a medium-scale ice-indentation test program on Hobson's Choice Ice Island in May, 1990. This test series was performed as an extension to a similar program of the previous year. A description of the 1990 test program along with an extensive characterization study of the observed failure surface is presented. More specifically, this study included measurements of the pulverized layer thickness, comparative density analysis of ice taken from the pulverized layer to undamaged ice, sieve analysis of ejected particles and microstructural studies of damage and pressure melting. -- Ice samples, both undamaged multi-year sea ice and ice from the pulverized layer, were collected and transported to the Ice-Structures Laboratory of Memorial University of Newfoundland. Uniaxial compression tests, including constant strain rate tests and creep tests, were conducted. Estimates of peak stress, elastic strain, delayed elastic strain and permanent viscous creep were determined and comparisons were made between undamaged, predamaged and pulverized ice. Substantial creep enhancement was observed, that is total creep strain appeared to be heavily influenced by the damage state. -- Utilizing measured parameters of the uniaxial compression test program, field observations and a damaging viscoelastic material model, finite element simulations were conducted. This finite element analysis focused on the behaviour of an intermediate layer of highly damaged ice at the ice-structure interface. Indentation test NRC-06 of the 1989 test program was chosen as the verification test.

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