Design Criteria of Strength Finite Element Analysis for Steam Turbine Components

According to many achievements in scientific research on the generality technology of strength finite element(FE) analysis for steam turbine components,the nine kinds of design criteria of strength FE calculation results for steam turbine components are presented.The type for loads and stresses,as well as the design principle of the FE analysis is described.It also provides design criteria for steady maximum load strength,over speed strength of rotary components,creep strength and stiffness,stress corrosion strength,high cycle fatigue strength,axial clearance,crack initiation life and crack propagation life of steam turbine components with FE calculation results.The allowable range of local stresses and the application field of the design criteria are provided.By means of the design criteria in steam turbines,the safety for the strength and life design of steam turbine components can be checked and analyzed.The suggesting method may provide a scientific basis for construction design,safety assessment and optimizing improvement of steam turbine components.