Internal Friction of Single-Crystal Ice.

• Main Authors: VanDevender,J. P., Itagaki,K.
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1973
• Subjects: Snow; Ice and Permafrost; Solid State Physics; (*ICE; *INTERNAL FRICTION); SINGLE CRYSTALS; DISLOCATIONS; MECHANICAL WAVES; DAMPING; COMPUTER PROGRAMS; X RAY IRRADIATION; PLASTIC DEFORMATION; STRESS WAVES; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/AD0759930; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0759930

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 ice samples and X-irradiating andplastically 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. (Author Modified Abstract)