A damage-mechanics coupling analysis based life assessment method on common material of large steam turbine rotor

A damage-mechanics coupling analysis based life assessment method on low-alloyed material (30Cr2MoV), which is always being used for manufacturing turbine rotors, was presented in this paper. It has been considered in the method that the material´s performance is deteriorated with the damaging process. The method was realized based on finite element technology by a computer code, which was developed with FORTRAN language and applied to a sample. The result was compared with those by conventional life evaluation method. The conclusion is that coupling method is reliable and can reduce the complexity of the conventional local-stress based fatigue life evaluation method. The method also exhibits more accuracy in description of fatigue phenomenon.