Work-Hardening and Strain Rate Sensitivity of Flow Stress in High Purity Ice Single Crystals.

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...

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Bibliographic Details
Main Author: Parameswaran,V. R.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1975
Subjects:
Snow
Ice and Permafrost
Crystallography
*Single crystals
*Ice
Strain rate
High purity
Dislocations
Hardening
Hardness
Motion
Plastic properties
Laboratory tests
Flow
Compression
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA018015
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA018015
Description
Summary: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)

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