Accession Number : ADA018015
Title : Work-Hardening and Strain Rate Sensitivity of Flow Stress in High Purity Ice Single Crystals.
Descriptive Note : Research rept.,
Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Personal Author(s) : Parameswaran,V. R.
Report Date : OCT 1975
Pagination or Media Count : 16
Abstract : Single crystals of high purity ice deformed by uniaxial compression on an Instron machine showed remarkable work- hardening after about 8% strain. By changing the strain rate during compression tests in the plastic region of the stress-strain curve, an apparent activation volume V* and a dislocation mobility exponent m were calculated from the strain rate sensitivity of flow stress. The large work-hardening and the rapid increase in the value of m beyond about 10% strain indicate that the plastic flow in this region is controlled by dislocation intersections and nonconservative motion of jogs. (Author)
Descriptors : *Single crystals, *Ice, Strain rate, High purity, Dislocations, Hardening, Hardness, Motion, Plastic properties, Laboratory tests, Flow, Compression
Subject Categories : Snow, Ice and Permafrost
Distribution Statement : APPROVED FOR PUBLIC RELEASE