Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 57 8 2025 10 23 Predicting the Creep–Fatigue life of a high-pressure gas turbine blade considering Fluid–Structure interaction Predicting the Creep–Fatigue life of a high-pressure gas turbine blade considering Fluid–Structure interaction 1037 1068 5976 10.22060/mej.2026.24927.7909 FA Ali Zolfaghari Department of Solid Mechanics, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran Amir Reza Shahani Department of Solid Mechanics, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran Narges Asadpour Department of Solid Mechanics, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran Journal Article 2025 10 19 To study the multiaxial low-cycle creep-fatigue life of high-pressure turbine blades, a multiaxial low-cycle fatigue life prediction model based on a new critical plate damage parameter is presented in this paper. First, by performing a three-dimensional thermal-structural coupling analysis of high-pressure turbine blades, the stress and strain distributions under different loadings including centrifugal force, thermal loading, and aerodynamic loading were obtained. Then, the multiaxial low-cycle fatigue life prediction model and the Larson-Miller equation were applied to predict the fatigue life and creep life of the blade separately. In addition, to investigate the fatigue damage mechanism in creep-fatigue interaction under high temperature conditions, the experimental methods available in previous studies were applied, and the creep-fatigue interaction life prediction model was also developed simultaneously Furthermore, the results of creep-fatigue life prediction indicated that in case of considering the creep-fatigue interaction, the life of the gas turbine blade was reduced by 43.7% , compared to the case where the interaction was not considered. Also, the maximum fatigue damage was concentrated at point A and the maximum creep damage was concentrated at point B. Finally, the results revealed that the multiaxial low-cycle fatigue life prediction model was reasonable and the creep-fatigue interaction should not be ignored. To study the multiaxial low-cycle creep-fatigue life of high-pressure turbine blades, a multiaxial low-cycle fatigue life prediction model based on a new critical plate damage parameter is presented in this paper. First, by performing a three-dimensional thermal-structural coupling analysis of high-pressure turbine blades, the stress and strain distributions under different loadings including centrifugal force, thermal loading, and aerodynamic loading were obtained. Then, the multiaxial low-cycle fatigue life prediction model and the Larson-Miller equation were applied to predict the fatigue life and creep life of the blade separately. In addition, to investigate the fatigue damage mechanism in creep-fatigue interaction under high temperature conditions, the experimental methods available in previous studies were applied, and the creep-fatigue interaction life prediction model was also developed simultaneously Furthermore, the results of creep-fatigue life prediction indicated that in case of considering the creep-fatigue interaction, the life of the gas turbine blade was reduced by 43.7% , compared to the case where the interaction was not considered. Also, the maximum fatigue damage was concentrated at point A and the maximum creep damage was concentrated at point B. Finally, the results revealed that the multiaxial low-cycle fatigue life prediction model was reasonable and the creep-fatigue interaction should not be ignored. https://mej.aut.ac.ir/article_5976_e10534dd65cf727692c0f9c44ba613f8.pdf