A New Predictive Method of Stress Relaxation Behavior for High Temperature Structural Materials

摘要

An estimation method to predict the stress relaxation behavior of high temperature structural materials has been proposed. The stress relaxation behavior is predicted by creep constitutive equations and the strain hardening flow rule. In order to validate the approach, the predicted results are compared to the experimental results of uniaxial isothermal stress relaxation tests conducted on G-X12Cr Mo W V NbN 10 1 1 steel at temperatures of 580, 600 and 620℃ and initial strain level of 0.8%. The calculated stress versus time curves were in good agreement with the measured curves at respective temperatures. The procedure of the estimation method, results of analyses and the accuracy of the prediction have been discussed in this paper.