Turbine Disk Retirement-for-Cause: Measurement of Inspection Uncertainty for Disk Eddy Current Inspections

dc.contributor.author	Rau, C
dc.contributor.author	Hopkins, S
dc.contributor.author	Eischen, J
dc.contributor.author	Allison, D
dc.date	2018-02-16T15:58:39.000
dc.date.accessioned	2020-06-30T06:28:10Z
dc.date.available	2020-06-30T06:28:10Z
dc.date.issued	1980
dc.description.abstract	<p>Major cost savings are possible through life extension of high-cost jet engine components until damage develops. Retirement-for-cause (RFC) decisions will be based upon both non-destructive inspection (NDI) to detect and size defects, and engineering analysis to assess defect severity under future usage. Failure Analysis Associates is performing a three-year program for ARPA/AFML to define and verify an optimum RFC strategy for jet engine disks. In depth, quantitative characterization of NDI performance is a major part of this project. This presentation summarizes the quantitative evaluation of inspection (NDI) uncertainty for four independent inspections - two state-of-the-art eddy current inspections of disk bolt holes, one with conventional hardware but improved signal processing, and one higher resolution eddy current inspection system assembled for this project. Separate inspections of the same 490 bolt holes in 49, 3rd stage disks retired from service in TF33 engines were performed with each of the four NDI techniques. Inspection results were compared with each other and with the actual cracks measured by surface plastic replicas and selected destructive metallography. The variation of detection probability and sizing errors with flaw size and indication level is defined in a form suitable.for the probabilistic reliability analysis and RFC strategy formulation. Progress in the other project tasks, especially the stress and fracture mechanics analysis to define the conditional failure probability if a flaw of specified size were present will also be summarized.</p>
dc.format.mimetype	application/pdf
dc.identifier	archive/lib.dr.iastate.edu/qnde/1979/allpapers/76/
dc.identifier.articleid	4630
dc.identifier.contextkey	7266212
dc.identifier.s3bucket	isulib-bepress-aws-west
dc.identifier.submissionpath	qnde/1979/allpapers/76
dc.identifier.uri	https://dr.lib.iastate.edu/handle/20.500.12876/58398
dc.language.iso	en
dc.relation.ispartofseries	Review of Progress in Quantitative Nondestructive Evaluation
dc.source.bitstream	archive/lib.dr.iastate.edu/qnde/1979/allpapers/76/1979_YellowJacket_028_Rau_TurbineDisk.pdf\|\|\|Sat Jan 15 01:50:47 UTC 2022
dc.subject.disciplines	Engineering Mechanics
dc.subject.disciplines	Mechanics of Materials
dc.subject.disciplines	Metallurgy
dc.title	Turbine Disk Retirement-for-Cause: Measurement of Inspection Uncertainty for Disk Eddy Current Inspections
dc.type	event
dc.type.genre	event
dspace.entity.type	Publication
relation.isSeriesOfPublication	289a28b5-887e-4ddb-8c51-a88d07ebc3f3

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