Loads and Vibration Induced by Compressive Failure of Ice

by I. J. Jordaan, Memorial Univ of Newfoundland, St John's, Canada,
K. P. Kennedy, Memorial Univ of Newfoundland, St John's, Canada,
R. F. McKenna, Memorial Univ of Newfoundland, St John's, Canada,
M. A. Maes, Memorial Univ of Newfoundland, St John's, Canada,



Document Type: Proceeding Paper

Part of: Cold Regions Engineering

Abstract: In earlier work, attention was focussed on the narrow length of crushed ice adjacent to the structure, which was seen as the seat of vibration associated with ice crushing. Crushed ice was modelled as a viscous material, following the pioneering work of Kheisin and his coworkers. The present paper deals with refinements to the previous model. Local high pressure zones are included by modelling the ice as sintered yet damaged. Lower pressure areas with wider extrusion spaces or areas of zero pressure (spalls) also exist. Upon pulverization in the high pressure areas, rapid extrusion and a pressure drop occur followed by solidification of the ice structure, possibly associated with refreezing of water that melted under high pressure. Ice in the high-pressure zone is analyzed as a damaging viscoelastic material for the load increase. A viscous approximation may be appropriate for certain time-scales. The method potentially will account for scale effects under conditions of compressive fracture, including the effect of flaws.

Subject Headings: Ice loads | Vibration | Failure analysis | Approximation methods | Compression | Spalling

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