Author(s): G. A. Kuehn; E. M. Schulson; W. A. Nixon
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Keywords: No Keywords
Abstract: Experiments have established that pre-strain under conditions where ice is ductile raises the strain rate at which the material undergoes the ductile-to-brittle transition under compression. For instance, .. . for columnar saline ice at -10°C compressed along the columns is increased from one to two orders of magnitude (i. e., 3 x 10-5 --> 10-4s-1 to 10-3 -->3 x 10-3s-1) upon prestraining -0.035 at 10-5 s-1. When prestrained the same amount by compressing in a direction normal to the column, .. . is increased by about one order of magnitude. Correspondingly, the strength is generally reduced. These effects are attributed to changes within the internal structure of the ice caused by the prestrain.
Year: 1988