Abstract
The stress relaxation behaviour of aluminium (99.99%) was investigated at three temperatures (295, 363 and 433 K). In addition to the customary experimental procedure, by which the total strain of the specimen is held constant during the test, the influence of cyclic unloading on stress relaxation behaviour was examined. A systematic study of the influence of the unloading amplitude, rate and frequency as well as of the test temperature demonstrated that both acceleration and deceleration of stress relaxation may be observed, depending on the test conditions. Empirical regularities are summarized and discussed. In particular, the phenomenological description of stress relaxation owing to Hart and Solomon ( Acta Metall. 21 (1973) 295–307) is extended to the case of cyclic relaxation. Deviations from the Hart-Solomon relation are also reported.
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