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Probabilistic TMF Life Evaluation of a Single Crystal Turbine Blade Concerning Uncertainty Quantification

[+] Author Affiliations
Xi Liu, Dianyin Hu, Bin Zhang, Rongqiao Wang

BeiHang University, Beijing, China

Paper No. GT2018-75927, pp. V07AT32A007; 7 pages
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 7A: Structures and Dynamics
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5113-5
  • Copyright © 2018 by ASME


Probabilistic-based design can efficiently quantify the risk and improve the reliability of the turbine blade. In this context, a probabilistic framework concerning the uncertainty quantification for the turbine blade’s TMF life based on the cyclic damage accumulation (CDA) method and Bayesian inference is proposed in this study. Firstly, the damage factors in the critical plane are obtained by the finite element method using Walker constitutive model, during which the discretization error is calibrated using Richardson extrapolation method. After that, the probabilistic TMF life model is established using CDA theory, in which the uncertainty of the material parameters is quantified using Bayesian inference. Finally, TMF life prediction on a single crystal nickel superalloy turbine blade is conducted using the probabilistic framework considering uncertainty quantification. The accuracy and validity of the proposed method is revealed by the comparison between the numerical and experimental results of real turbine blades.

Copyright © 2018 by ASME



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