Work-hardening and strain rate sensitivity of flow stress in high purity ice single crystals
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.
- Publication:
-
Research Report Army Cold Regions Research and Engineering Lab
- Pub Date:
- October 1975
- Bibcode:
- 1975army.rept.....P
- Keywords:
-
- Ice;
- Single Crystals;
- Strain Rate;
- Crystal Dislocations;
- Strain Hardening;
- Solid-State Physics