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):

Report Date:

1975-10-01

Pagination or Media Count:

16.0

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

Subject Categories:

  • Snow, Ice and Permafrost
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE