THE DEVELOPMENT OF A SINGLE CRYSTAL CREEP MODEL FOR THE ANALYSIS OF TURBINE BLADE APPLICATIONS

摘要

Gas turbine blades are being manufactured increasingly from nickel-based single crystal superalloys due to the higher temperature capability and longer component lives provided. A constitutive model has been developed to calculate creep strains for single crystal materials that assumes that the inelastic deformation is due to crystalline slip. Results are compared with experimental data for various orientations and for a range of temperatures and stresses. The model has been coded as an ABAQUS user material subroutine. Predictions for the anisotropic creep behaviour of a number of specimen and blade designs have been made.