Author(s): Jing Xiao; Ian J. Jordaan; Sanjay K. Singh
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Keywords: No Keywords
Abstract: The present work is principally concerned with the load oscillations induced by ice crushing failure against a structure. Evidence of pressure melting has been reported from both laboratory and medium-scale field indentation tests. Possible effects of pressure melting on ice-induced vibrations has been investigated. When pressure melting occurs, both viscosity and friction of the ice are reduced. As a result, the strength of crushed ice at the interface is reduced, and the pressure exerted on the structure drops. Once the pressure is released, the ice will refreeze, resulting in the recovery of the viscous and frictional properties, and the load rebounds. Repeating this process results in load oscillation. This hypothesis is implemented into finite element models. Two trial test cases are carried out to simulate the extrusion of crushed ice in the laboratory and field indentation tests. An ice damage model has been included to address the material response under the influence of microcracking. Preliminary analyses have shown promising results in the light of experimental programs where load oscillations have been observed.
Year: 1992