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Equivalent Initial Flaw Size Distribution Determination for Gas Turbine Blades Based Upon Inspection Data

[+] Author Affiliations
W. S. Johnson, A. C. Wilson, S. Highsmith, Jr.

Georgia Institute of Technology, Atlanta, GA

Paper No. GT2005-69124, pp. 571-577; 7 pages
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2005
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4727-6 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME


A fracture mechanics-based methodology is presented for determining equivalent initial flaw size (EIFS) distributions from field inspection data accounting for different service histories of fracture critical components. The EIFS distribution based on inspection data from a subset of the fleet allows for an assessment of initial material/manufacturing quality and enables a probabilistic fracture mechanics-based fatigue life prediction for the fleet as a whole. The methodology is demonstrated on an industrial gas turbine blade experiencing in-service cracking.

Copyright © 2005 by ASME



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