Mechanical properties of single crystals of ice. part 1, geometry of deformation
Nakaya, Ukichirō, 1900-1962.
Research ReportSummary: Bending tests were performed on nearly 300 rectangular bars of glacier ice cut from large single crystals (up to 16 in.) at varying orientations, and deformation was studied through measurements of vertical displacement of a median loaded wedge by means of a screw micrometer. The deformation was complex, sometimes varying with slight changes in crystallographic orientation in the sample. The phenomena observed can be explained by assuming that: single crystals of ice have a layer structure stacked in the direction of the optic axis; plasticity is due to gliding between these elementary layers; a small-angle boundary is likely to occur at the point of intense stress concentration (upon which the sample deforms like an assembly of blocks); and the elementary layer is flexible but not stretchable. These assumptions are also valid for compression or elongation. NOTE: This file is large. Allow your browser several minutes to download the file
U.S. Army Snow, Ice, and Permafrost Research Establishment.Engineer Research and Development Center (U.S.)
Ice; Ice crystals; Deformation; Ice mechanics; Plasticity; Glacier Ice; Glaciers; Glaciology
Research report (U.S. Army Snow
Approved for public release; distribution is unlimited.