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https://hdl.handle.net/11681/5931| Title: | Internal friction of single-crystal ice |
| Authors: | VanDevender, J. P. Itagaki, Kazuhiko |
| Keywords: | Acoustic wave propagation Crystal dislocation Detection of seismic waves Internal friction damping Single-crystal ice Ice Ice crystals Ice crystal dislocation Ice friction |
| Publisher: | Cold Regions Research and Engineering Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Research report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 243. |
| Description: | Research Report Abstract: The internal friction of single-crystal ice has been attributed to reorientation of the water molecule under periodic stress. However, the theory for damped dislocations, which offers another mechanism for the internal friction of ice, has not been investigated. The effects of scratching the surface of 41 ice samples and X-irradiating and plastically deforming them were evaluated. The effects observed on the internal friction of pure, single-crystal ice, in the flexure mode of oscillation between 400 and 1400 Hz, supported the existence of a dislocation-controlled mechanism, with the drag produced by the interaction of the dislocation with the protons in the crystal. In addition, analysis of the detailed shape of the data curve showed two peaks of tan delta as a function of temperature. The second peak, which had not been previously reported, had an activation energy of 0.16 eV and a relaxation time of 1.7 x 10^8 sec at infinite temperature. These experiments indicated that both peaks vrere controlled by the dislocation mechanism described above. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/5931 |
| Appears in Collections: | Research Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| CRREL-Research-Report-243.pdf | 2.03 MB | Adobe PDF |  View/Open |