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The Importance of Batch Effects When Considering Damaged Holes in Manufacture

[+] Author Affiliations
R. S. J. Corran

Rolls-Royce plc, Derby, UK

Paper No. GT2006-90337, pp. 833-839; 7 pages
doi:10.1115/GT2006-90337
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4240-1 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

Anomalies in material condition can arise for Critical Rotating Parts in gas turbines in melt, manufacture and handling. To use a probabilistic approach when designing against burst from such anomalies it is necessary to gather data describing their frequency of occurrence and their size when they do occur. Because of the rare occurrence of such anomalies it is likely that industry data compiled from a wide number of manufacturers will be used to define the exceedance curve. However anomalies may not occur in isolation. Certain causes, such as a worn drill in holemaking, will likely lead to a sequence of damaged holes possibly with increasing depths of distorted material. It is shown that the presence of a batch effect can make a significant difference to the probability of a large anomaly. A method of translating between averaged data gathered from a number of sources and specific component data that recognises the batch effect is described. The examples used here are similar to data gathered from manufacturing anomalies in holes.

Copyright © 2006 by ASME

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