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

Abstract

A multi-axial continuum damage mechanics (CDM) model was proposed to calculate the multi-axial creep-fatigue damage o f a high temperature component. A specific outer cyl inder o f a 1000M W supercritical steam turbine was used in this study, and the interac tion o f the creep and fatigue behavior o f the outer cylinder was numerically investigated under a startup-running-shutdown process. To this end, the multi-axial stress-strain behavior o f the outer cylinder was numerically studied using A baqus. The in-site meas ured temperatures were provided to validate the heat transfer coefficients, which were used to calculate the temperature field o f the outer cylinder. The multi-axial mechanics behavior o f the outer cylinder was investigated in detail, with regard to the temperature, Mises stress, hydrostatic stress, multi-axial toughness factor, multi-axial creep strain, and damage. The results demonstrated that multi-axial mechanics behavior reduced the total damage.

Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel

“…The average grain size was determined by optical microscopy studies of 12% Cr steel (Dong et al, 2013;Yaso et al, 2009). Temperature-dependent physical properties of the material are available in (Wang, 2014). A set of random crystallographic orientations was assigned to each grain, with the inverse pole figure shown in Periodic boundary conditions were imposed on the four lateral faces (X 0 , X 1 , Z 0 and Z 1 ) as shown in Fig.…”

Creep-fatigue endurance of a superheater tube plate under non-isothermal loading and multi-dwell condition

“…Many researchers have addressed various approaches to assess creep and fatigue behaviour for engineering components within the steam power plant system, including casings [4,5], rotors [6] and bolts [7], but many other researches doing creep-fatigue assessment are limited within the scope of material. On the other side, in terms of the scope of structure, the overall structural response can vary significantly if single or multiple creep dwell is considered under a cyclic loading condition [8].…”