Author(s): Andrew Palmer; John Dempsey
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Keywords: No Keywords
Abstract: There is much field, laboratory and theoretical evidence that the contact force between ice and a structure during a crushing or spalling event is very far from uniformly distributed, but that most of it is concentrated in localised high-pressure zones (‘hot spots’). This behavior is expected for brittle materials, and is confirmed by the JOIA field-scale experiments using tactile sensors, and by Sodhi’s laboratory results. It has important implications for the structural design of Arctic offshore structures, and for the understanding of pressure/area relationships. The paper presents new work on high-pressure zones and how they link to total forces in contact events with wide structures, and relates them to alternative modes such as indentation spalling and buckling. The results make it possible to develop mode maps consistent with dimensional analysis and based on fundamental parameters such as fracture toughness.
Year: 2002