Abstarct: Abstract In this thesis, the creep behavior of a gas turbine blade made of IN792 superalloy has been investigated. For a more precise analysis, the advanced Theta Projection method was employed. This method, as an innovative approach in creep modeling, enables a more detailed and comprehensive examination of the phenomenon. Initially, the Theta model parameters were obtained through experimental tests from a reliable source. In this stage, material behavior curves under different loading conditions were analyzed using curve fitting techniques in MATLAB to extract accurate Theta parameters. These parameters were then utilized as key inputs in determining the material constants. In the next step, a dedicated subroutine was developed to transfer the obtained data into the ABAQUS. This subroutine allowed for a more accurate simulation of the creep behavior of the IN792 superalloy under operational conditions. Using this simulation, the creep phenomenon in gas turbine blades was examined, and the material behavior under various rotational speeds was analyzed. The results of this study demonstrated that the Theta Projection method is a powerful tool with high capability in predicting and modeling the creep behavior of advanced superalloys. Furthermore, this research highlighted that integrating experimental data with numerical simulations significantly enhances the accuracy and efficiency of creep models. Ultimately, the findings of this study can serve as a foundation for designing and optimizing gas turbine blades in the aerospace and energy industries.