Evaluation of Damage Tolerance Requirements Using a Probabilistic-Based Life Approach FREE

[+] Author Affiliations
C. G. Annis, Jr., D. T. Hunter, T. Watkins, Jr.

Pratt & Whitney, West Palm Beach, FL

Paper No. 86-GT-266, pp. V002T02A016; 5 pages
  • ASME 1986 International Gas Turbine Conference and Exhibit
  • Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery
  • Dusseldorf, West Germany, June 8–12, 1986
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7929-0
  • Copyright © 1986 by ASME


This paper presents the results of a study using Pratt & Whitney’s probabilistic-based life analysis system to define the impact of damage tolerance requirements now being written into design specifications. An advanced turbine disk design was considered for several combinations of NDE starting with baseline values representative of actual material and NDE capabilities. Significant conclusions are:

(1) Conventional single-valued descriptions of NDE capability (e.g. 90/95, etc.) are incomplete for comparing competing NDE systems.

(2) The scatter about the mean NDE capability has little influence on system behavior.

These conclusions suggest that more complete descriptions of damage tolerance requirements should be considered. NDE requirements, for example, might be better stated in terms of system performance goals – acceptable failure and removal rates – rather than any specific POD/confidence limit requirement.

Copyright © 1986 by ASME
Topics: Damage
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