The temperature field

thermal stress field

and mechanical stress under different operating conditions before and after crack[CD*2-ing of the rotor for 50 MW steam turbine in one power plant have been calculated through the finite element analysis. The results of calculation show that the crack to be situated at location of max. stress occurred on the rotor. After turning

the elastic slot at the crack position makes the max. stress on the rotor to be lowered

the size of elastic slot affects greatly the factor of stress concentration. The results of calculation provide technical data for rotor’s crack-turning fabricating scheme and for safety assessment.