High-strain-rate measurements of dislocation mobility
Conference
·
OSTI ID:6814065
The strain rate sensitivity in a variety of metals is known to increase dramatically when the strain rate exceeds about 10/sup 3/ s/sup -1/. In copper, this behavior is analyzed in terms of the transition in rate controlling deformation mechanism from thermal activation to dislocation drag. Experimental results can be made to agree with a model of this transition, which leads to several observations regarding dislocation mobility at these high strain rates. The mobile dislocation density is estimated to be a mildly increasing function of stress or strain rate at any one strain and is roughly independent of strain for 0.05 less than or equal to epsilon less than or equal to 0.20.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6814065
- Report Number(s):
- LA-UR-84-1621; CONF-8308172-1; ON: DE84012448
- Resource Relation:
- Conference: International symposium on mechanics of dislocations, Houghton, MI, USA, 28 Aug 1983; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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·
OSTI ID:6814065