Some observations relating to recovery of internal friction during fatigue of aluminum
- Creators
- Valluri, S. R.
Abstract
Recovery of internal friction during periods of rest in specimens subjected to fatigue stresses in torsion bas been studied experimentally with high-purity aluminum. The effective heat of activation for the process is found to be about 10,000 calories per gram molecule or less. The idea is presented that the dislocations responsible for the recovery of internal friction are the same as those responsible for fine slip which, according to one existing theory, is the mechanism responsible for fatigue failure. Experimental results indicate that obtaining a recovery factor independent of stressing history may possibly be associated with installing a cyclic process in which the subgrain structure is well established. The basic process then occurring may be one of indefinite to-and-fro motion of some free dislocations within a framework of immobilized arrays of dislocations responsible for the general plastic flow and the substructure.
Additional Information
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Published - VALnacatn4371.pdf
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Additional details
- Eprint ID
- 48204
- Resolver ID
- CaltechAUTHORS:20140807-151119753
- Created
-
2014-08-07Created from EPrint's datestamp field
- Updated
-
2019-10-03Created from EPrint's last_modified field
- Other Numbering System Name
- NACA Technical Note
- Other Numbering System Identifier
- 4371