Author(s): D. L. Bentley; J. P. Dempsey; D. S. Sodhi; Y. Wei
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Abstract: A series of 30 fracture toughness tests were performed on laboratory-grown S2 columnar freshwater ice at high homologous temperatures (-2 to 0°C). The floating double cantilever beam specimen used and the monitoring of the crack mouth opening displacement in addition to the applied load provided a means for obtaining an apparent fracture toughness, an effective elastic modulus, a lower-bound estimate of the crack speed, and a side-loaded flexural strength of the ice. An expression for the apparent fracture toughness as a function of the applied load, specimen geometry, and ice thickness was developed using a finite element program. This allowed comparison with previously published values for the toughness of freshwater ice. The small range of scatter in apparent fracture toughness values as well as the ability to measure other mechanical properties of the ice indicates the usefulness of such tests.
Year: 1988