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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