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Journal of Failure Analysis and Prevention

, Volume 18, Issue 6, pp 1361–1368 | Cite as

Thermo-Mechanical Fatigue Life Assessment of a Gas Turbine Rotor Through Reliability Approach

  • S. Esakki MuthuEmail author
  • Raghu V. Prakash
  • R. K. Mishra
  • A. Sakthivel
Technical Article---Peer-Reviewed

Abstract

Turbine rotor is a critical and life-limiting component in gas turbine engines. The thermo-mechanical fatigue (TMF) life of a turbine rotor was studied using reliability method. The fatigue life was estimated using (a) Marrow’s model and (b) Smith–Watson–Topper model. The creep life was estimated based on Larson Miller equations and finite element analysis. The cumulative fatigue–creep damage was estimated, and the turbine rotor TMF life was estimated against the data variation. The reliability approach takes care of material property variations, load variations and geometrical variations. These variations bring out the scatter in component stress–strain and further into life. The scattered life spells out the component reliability. The TMF life was modeled as Weibull distribution, and the reliability was estimated. The component was tested for structural integrity through hot cyclic spin test, and the results were compared with the predictions. The blade growth and strain estimations using Marrow and SWT–creep methods were found in good agreement with the test values.

Keywords

Turbine rotor Fatigue life Creep Weibull Reliability 

List of symbols

SWT

Smith–Watson–Topper method

TMF

Thermo-mechanical fatigue

LCF

Low-cycle fatigue

HCF

High-cycle fatigue

UTS

Ultimate tensile strength

LMP

Larson Miller parameter

c

Fatigue ductility exponent

\( \sigma_{f}^{{\prime }} \)

Fatigue strength coefficient

\( \epsilon_{f}^{{\prime }} \)

Fatigue ductility coefficient

E

Young’s Modulus

εa

Total strain amplitude

εe

Elastic strain amplitude

εp

Plastic strain amplitude

σmax

Maximum stress

η

Weibull scale parameter

β

Weibull shape parameter

Notes

Acknowledgments

The authors acknowledge the Chief Designer of Aero Engine R&D Centre and engineers of Hindustan Aeronautics Limited, Bangalore, India, for their support and permission to publish this work.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • S. Esakki Muthu
    • 1
    Email author
  • Raghu V. Prakash
    • 2
  • R. K. Mishra
    • 3
  • A. Sakthivel
    • 3
  1. 1.Aero Engine R&D CentreHALBangaloreIndia
  2. 2.Indian Institute of Technology MadrasChennaiIndia
  3. 3.Centre for Military AirworthinessBanagloreIndia

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