Predicting the Creep–Fatigue life of a high-pressure gas turbine blade considering Fluid–Structure interaction

Document Type : Research Article

Authors

Department of Solid Mechanics, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran

Abstract

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.

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Amirkabir Journal of Mechanical Engineering
Volume 57, Issue 8
November 2025
Pages 1037-1068

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