STRAP: Steam Turbine Rotor Analysis Program. Part 1. General Information Manual

摘要

The automated Steam Turbine Rotor Analysis Program (STRAP) has been developed to facilitate the prediction of rotor lifetime given the duty cycle of the turbine and the results of ultrasonic examination from the rotor bore. STRAP consists in part of a preprocessor that generates the boundary conditions and finite element mesh for transient and steady-state temperature and stress analysis. The input thus generated is utilized by ANSYS, a general purpose, finite element structural analysis program. A postprocessor within the STRAP system contains fracture toughness, stress-rupture, yield strength, and fatigue crack growth rate data for air-melted CrMoV forgings, on the basis of which ANSYS-calculated stress and temperature values are screened to determine critical crack size, initial crack size that could grow to critical size within a specified number of hours or cycles, and minimum area fraction of defects which could link to result in a significant crack.