Research On Numerical Simulation And Lifetime Of High-temperature Components Creep Damage Under Multiaxial Stress State

In this paper, metallic multiaxial creep and uniaxial creep have been investigated basedon P91 steel of experiment data in ANSYS. With respect of user-defined routine ofcommercial structure analysis code ANSYS, a creep damage constitutive model based onFORTRAN programs is implemented, which the tertiary stages can be simulated inconsideration of creep damage. A good coincidence between simulation results andexperimental data can also be observed. Under high Temperature-Pressure, skeletal pointstress and the relationship between the rupture time of multiaxial creep and uniaxial creep areinvestigated, and stress redistribution of Elbow creep is studied and analyzed. By means ofskeletal point stress analysis, the creep effect and creep wastage variation on elbow aremanifested. In a word, the paper can create an academic base for hight-temperaturecomponents creep lifetime forecast.