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Some observations relating to recovery of internal friction during fatigue of aluminum

Valluri, S. R. (1958) Some observations relating to recovery of internal friction during fatigue of aluminum. National Advisory Committee for Aeronautics , Washington, DC.

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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.

Item Type:Report or Paper (Technical Report)
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NACA Technical Note4371
Record Number:CaltechAUTHORS:20140807-151119753
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ID Code:48204
Deposited By: George Porter
Deposited On:07 Aug 2014 22:22
Last Modified:03 Oct 2019 07:01

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