On the Measurement of Recovery Rates during High-Temperature Creep

Abstract

The theoretical grounds for measuring the recovery rate during creep by the stress-drop method have been examined in terms of a recovery creep model. Reasonably good values for the recovery rate are obtained when certain experimental restrictions are applied. One important finding is that the method can be utilized only when the creep test has reached steady state, and is therefore invalid during the primary-creep stage. When the stress-drop method is employed in the primary-creep stage, the measured “recovery rate” and the actual rate change inversely i.e. the measured rate decreases gradually whereas the actual rate increases.