Abstract:The double shear specimen was designed for the study of the creep behavior of nickel base single crystal superalloys at high temperature. The creep stress and strain distributions and the influence of boundary conditions for the specimen are studied in the present paper. The results show that a preliminary analysis, by using the finite element code ABAQUS and RIGID SURFACE as a boundary condition for loading is conservative because a homogeneous state of shear stress is maintained only up to shear strains of the order of 10%. Using a more realistic boundary condition for loading (ABAQUS option: CONTACT PAIR), the homogeneous state of shear stress in the double shear specimen is maintained throughout creep up to much higher shear strains than that of the originally estimated. A macrorelationship has been built between the material creep properties (Norton law) and the macrobehavior of the double shear behavior, so that the material creep properties can be derived from the creep experiments of double shear specimens, and corresponding equations have been presented. Therefore, the further work on crystallographic anisotropic finite element creep stress analysis of our double shear creep specimen will be based on the more realistic loading condition which is represented by the ABAQUS option CONTACT PAIR A good agreement has been obtained between the creep behavior of the double shear damage specimen of the experiment and finite element analysis on nickel base single crystal superalloys.