INTERNAL FRICTION OF H2O, D2O AND NATURAL GLACIER ICE

• Main Author: Kuroiwa,Daisuke
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1965
• Subjects: *GLACIERS; ICE; INTERNAL FRICTION; WATER; HEAVY WATER; IMPURITIES; VISCOSITY; CRYSTAL LATTICES; Canada; Greenland; Antarc*; Antarctica; glacier; glacier*
• Online Access: http://www.dtic.mil/docs/citations/AD0615732; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0615732

The three parts of this report are entitled (1) internal friction of pure H2O, D2O and doped ice crystals, (2) internal friction at crystal boundaries, and (3) the internal friction of natural glacier ice. Part 1 uses the flexural vibration method and expresses internal friction as a logarithmic decrement of free oscillation. Equations are given for the logarithmic decrement, internal friction, and the resonant frequency of a rectangular bar. In Part 2 the grain boundary internal friction of ice grown from a melt was measured by cutting blocks containing individual crystal boundaries from polycrystalline ice and inlaying these in single crystal bars. This friction depends upon concentrated chemical impurities. In Part 3 the internal friction of glacier ice was measured in specimens form Antarctica, Greenland, and Le Conte Glacier, Canada. Distinctively different curves were obtained for the specimens. These differences can be attributed to (1) environmental conditions at the time of formation, and (2) the environmental conditions that acted on the sample from the time of formation until the time of sampling. (Author)