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Statistical characteristics for the strain-dependent density and the spatial position for deformation-induced cracks in columnar-grain ice

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Observations on the spatial distribution and on the strain dependence of the crack density are given for cracks formed during compressive, unidirectional, constant-strain-rate deformtion of columnar-grain ice. Specimens, in the grain-size range of about 2 9 mm, were stramed at the nom mal rates of 103,101 and 105. s1 at 10°C. The axis of hexagonal crystallographic symmetry of each specimen grain tended to be in the plane perpendicular to the long direction of the grains and to have a random orientation in that plane. For stress applied perpendicular to the long direction of the grains, the deformation was practically two-dimensional. It was found that the log-normal distribution function provided a good approximation to the strain dependence of the crack density. Statistical characteristics of the distribution had a maximum in the same range of strain rate as found for the strength of columnar-grain ice. Analysis of tbe spatial distribution of the cracks indicated some deviation from randomness for specimens of grain-size less than 5 mm and total strain less than 50 x 104 The observations provide further evidence that crack formation under the experimental conditions is a random process.

Document Type: Research Article


Publication date: June 1, 1999

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  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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