Author(s): D. S. Sodhi
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Keywords: No Keywords
Abstract: We discuss the results of medium-scale and small-scale indentation tests, which were conducted by pushing flat indentors against the edges of freshwater ice sheets. In these tests, we installed grid-based tactile pressure sensors at the ice-structure interface to measure the pressure generated during an interaction. The experimental data show that there is ductile deformation of ice at low indentation speeds and continuous brittle crushing at high indentation speeds. During a typical cycle of the dynamic ice-structure interaction at intermediate speeds, the tactile sensor data indicate that the ice deforms in a ductile manner during the loading phase, and fails in a brittle manner during extrusion phase. For continuous brittle crushing, theoretical estimates of global force are derived in terms of the average and the standard deviation of non-simultaneous local force per unit width. For high rates of indentation, we find the effective pressure measured during small-scale indentation tests to be close to those measured on full-scale structures.
Year: 2000