Through nonlinear numerical analysis and simulated calculation of the heat-stress coupled field for home-made 300MW peak-reguling steam turbine’s rotor under typical starting-up operation

the stress and temperature fields’ distribution on the rotor of said steam turbine during the course of starting-up has been obtained

and the low cycle fatigue damage of the said turbine having been analysed by using continuous damage model. Taking the effects of muti-axial stress into account

the damage evolvement equation has been obtained

and the residual service-life of the said rotor being evaluated

providing a certain theoritical basis for the on-line monitoring and service-life management of steam turbine unit

and an operational proposal for its application in engineering.