Considering the isotropic damage

the principal of strain-equivalence was utilized to constitute the multi-axial creep equations together with the time-hardening creep law.The method of determining material parameters was developed through uni-axial creep test data.Numerical simulations were conducted by implementing them into ABAQUS using a user subroutine UMAT through a self-adaptive forward Euler integrate algorithm.Analysis was carried out for the evolution of creep damage and the influences of temperature and load.