Author(s): B. L. Parsons; J. B. Snellen; D. B. Muggeridge
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Abstract: The initiation and arrest stress intensity factors of ice were measured for the first time. Data was collected in the field using Double Torsion fracture specimens (0.04m x 0.5m x 1.0m) prepared frcm first year colunnar sea ice. No stable sub-critical growth was observed, rather cracks extended in a slip-stick manner. No creep fracture was observed. The initiation stress intensity factor was found to increase with decreasing loading rate, but the arrest stress intensity factor is time independent. The crack growth length depends on the drop frcm initiation to arrest value during the event, but showed no significant dependence on load rate. Arrest was observed to occur in brine drainage channels and not at grain boundaries. The results show that the arrest stress intensity factor should be used in crack length predictions during indentation phenomena, not critical stress intensity factor. Crack growth in ice is unstable, dynamic and supplies significant kinetic energy to the ice.
Year: 1988