Analysis of Multi Axial Creep–Fatigue Damage on an Outer Cylinder of a 1000 MW Supercritical Steam Turbine

Abstract

A multiaxial continuum damage mechanics (CDM) model was proposed to calculate the multiaxial creep–fatigue damage of a high temperature component. A specific outer cylinder of a 1000 MW supercritical steam turbine was used in this study, and the interaction of the creep and fatigue behavior of the outer cylinder was numerically investigated under a startup–running–shutdown process. To this end, the multiaxial stress–strain behavior of the outer cylinder was numerically studied using Abaqus. The insite measured temperatures were provided to validate the heat transfer coefficients, which were used to calculate the temperature field of the outer cylinder. The multiaxial mechanics behavior of the outer cylinder was investigated in detail, with regard to the temperature, Mises stress, hydrostatic stress, multiaxial toughness factor, multiaxial creep strain, and damage. The results demonstrated that multiaxial mechanics behavior reduced the total damage.