Creep-Rupture Properties Under Conditions of Constant and Varying Stresses

An analytical model has been developed for using creep data at a constant stress to predict creep behavior under a linearly increasing stress. The applicability of this technique to several refractory alloys has been demonstrated by comparing predicted and observed behavior. It was found that the model does not apply equally well to all materials and that it is necessary to perform limited tests to demonstrate its applicability to a given material.