Abstract

The paper presents a model for creep basing on the so-called characteristic creep strain and illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model relating the stress exponent with the creep rupture strength and current stress. Creep strain is a function of the above two quantities, i.e. rupture strength and current stress, and a characteristic creep strain which is material constant for a given time and temperature. Computational examples regard the rotating and pressure components analysed using the finite element method.