Prediction of stress relaxation from creep data in terms of average creep rate

Abstract

A new prediction model of stress relaxation from creep data in terms of average creep rate was established. An incremental calculation procedure has been further established to obtain stress relaxation data from creep data. To validate the effectiveness of the proposed conversion models, the predicted results were compared with those obtained by the previous continuum damage mechanics model as well as the stress relaxation experimental data using 1Cr10NiMoW2VNbN steel. Results showed that the creep–stress relaxation conversion model based on the average creep rate is better than that based on the continuum damage mechanics model because the former avoids the dispersion effect of fracture strain data, although the predicted results from the two models are both well in agreement with the experiment data.