Developing a CDM Based Model for Creep-Fatigue Life Assessment of a Gas Turbine Blade

Document Type : Research Article

Authors

1 School of Mechanical Engineering Iran University of Science &Technology

2 Student of Master of Science, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

Abstract

The aim of this research is to propose a procedure for predicting the creep-fatigue life of gas turbine blade. Components in gas turbine hot section such combustion chamber and turbine get damaged under effect of thermomechanical loadings. These damages developed via fatigue and creep together, thus it is necessary to identify their interaction with each other. Chaboche’s elasto-viscoplastic model which is an appropriate model for simulating the behavior of nickel alloys is used. Damage evolution rules for fatigue and creep which introduced by Chaboche and Kachanov, respectively, added to viscoplastic model and implemented in ABAQUS by developing an appropriate UMAT. After verification of developed subroutine, the creep-fatigue life of a rotor blade in last stage of a low-pressure turbine was assessed. The predicted life has presented in three ways as (1) the operating hours, (2) the number of starts and (3) the equivalent operation hours which are the common ways of announcing gas turbines life. Comparison the obtained results with common gas turbine lifetimes represents the capability and practicality of proposed model.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 10
January 2021
Pages 2951-2966

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