Analysis of compressive ice failure and ice crushing dynamics during medium-scale indentation tests

Birajdar, Pranav Rajshekhar (2017) Analysis of compressive ice failure and ice crushing dynamics during medium-scale indentation tests. Masters thesis, Memorial University of Newfoundland.

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Abstract

Medium-scale laboratory tests have been carried out with an aim to improve the understanding of compressive ice failure phenomena and links between the formation of high-pressure zones and the occurrence of ice-induced structural vibrations under controlled conditions. The tests presented in this thesis focus on the indentation of ice using a single spherical indenter mounted on rigid and compliant indentation systems. Fifteen indentation tests were performed to investigate the effects of ice temperature, indenter size and structural feedback on ice failure processes associated with high-pressure zone formation and evolution during dynamic ice crushing tests. It was observed that ice at warm temperatures was more prone to ductile type failure with lower, less dynamic pressures. By contrast, results from tests conducted at colder temperatures were characterized by a combination of spalling and crushing failure, which associate more with large-amplitude, sawtooth load cycles. In terms of scale effects, it was observed for the same indentation rate and temperature, smaller indenters produced higher amplitude, higher frequency sawtooth loading than was observed for larger diameter indenters. It was also observed that the structural compliance aids in the formation and development of cyclic loading patterns. Results presented in this thesis will be used to guide the remainder of the ice crushing dynamics research program.

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