Low cycle fatigue life prediction of steam turbine rotor based on a new CDM model

Low cycle fatigue life of a steam turbine rotor is predicted using a new CDM model. A simulation experiment is made to compute the damage accumulation of a 300MW steam turbine rotor under cold start. Adopting the cyclic stress-strain relation, this new continuum damage mechanics model exhibits a conservative character. Comparison with result of the linear accumulation theory and practical test data indicates that present new nonlinear CDM model describes the damage accumulation more precisely and reasonably in engineering.