Candidate creep-recovery model for 2 1/4 Cr--1 Mo steel and its experimental implementation

A uniaxial, creep-recovery model due to R. Lagneborg is recast into a form which facilitates its implementation through a testing program which is entirely phenomenological. The model is being considered under the High- Temperature Structural Design Program at ORNL as a candidate model for 2$sup 1$/ $sub 4$ Cr--1 Mo steel at high temperature. A specific experimental program is proposed for the determination of the several material parameters of the model. Generalization of the uniaxial formulation to that for general states of stress is briefly discussed. (auth)