Abstract
A number of experimental observations, supported by some theoretical considerations, have suggested the existence of a threshold stress for deformation, which signifies that an effective stress, rather than the applied stress, is responsible for the observed creep rate. In addition, recent experimental evidence shows that under some conditions of deformation the threshold stress varies strongly with temperature. The effect of the temperature dependence of the threshold stress on the measured values of the activation energy and the stress exponent is examined and it is shown that this temperature dependence may complicate various creep plots. Also, consideration of the nature of the interaction between different creep processes suggests that under certain experimental conditions it may be difficult to distinguish the difference between the operation of two sequential mechanisms and the operation of a threshold stress process.
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