Abstract
The effect of the fatigue damage parameter on the cumulative life of a high-speed turbine rotor has been estimated through finite element approach. Two most commonly used multiaxial fatigue damage models based on critical plane approach-Fatemi Socie (FS) model, and Kandil Brown and Miller model (KBM) have been used to estimate the fatigue life. Structural integrity test was carried out in spin test facility to validate the simulation results. KBM model for fatigue life estimation and LMP model for creep damage predicted a cumulative life within a factor of 1.5 scatter band of the experimental value. The combination of FS model for fatigue life estimation and LMP model could predict cumulative life only within a scatter band of 2. Some of the shortcomings attributed to LDS method can be obviated using a suitable fatigue damage parameter. The study provides invaluable input and confidence for the life prediction of high-speed gas turbine rotors.
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Abbreviations
- b :
-
Fatigue strength exponent
- c :
-
Fatigue ductility exponent
- σ ′f :
-
Fatigue strength coefficient
- ɛ ′f :
-
Fatigue ductility coefficient
- b o :
-
Fatigue strength exponent in torsion
- τ ′f :
-
Shear fatigue strength coefficient
- γ ′f :
-
Shear fatigue ductility coefficient
- c o :
-
Fatigue ductility exponent in torsion
- E :
-
Young's modulus
- G :
-
Shear modulus
- ∆ɛ eq :
-
Equivalent von Mises strain range
- ∆γ eq :
-
Equivalent shear strain range
- ∆ɛ 1 :
-
Maximum principal strain range
- σ n,max :
-
Maximum normal stress
- ∆ɛ n :
-
Maximum normal strain range
- σ m :
-
Mean stress
- σ a :
-
Alternating stress
- ∆γ max :
-
Maximum shear strain range
- k :
-
Material constant
- S :
-
Material constant
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Dileep, S., Esakki Muthu, S., Udayanan, P. et al. Effect of Fatigue Damage Parameter on the Cumulative Life of a Turbine Rotor Under Multiaxial Loading. J Fail. Anal. and Preven. 16, 612–621 (2016). https://doi.org/10.1007/s11668-016-0127-9
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DOI: https://doi.org/10.1007/s11668-016-0127-9