The Emergence of Extended Field Technology in the Air Force

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1996
Authors
Braun, T.
Keppler, E.
Price, L.
Nuxoll, G.
Ghlen, M.
Gehlen, M.
Lyders, D.
Henderson, J.
Stone, R.
Arispe, B.
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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Abstract

The wide-field eddy-current probe was developed to fulfill the inspection requirement of the broach slots in Pratt & Whitney F100-PW-220 Stage-1 and Stage-3 Compressor Disks. The flaw-detection requirement is to inspect an area 0.07 in. from the inner radius of the slot and 0.10 in. from the top and bottom edges for determining the presence of 0.006-and 0.010-in.-deep axially oriented flaws (Figure 1). While the slot is relatively small, the time required for inspection using the previous method is considerable. With this method a D20 (0.029-in.-diameter) split “D” coil is scanned in a “sew-stitch” fashion in the axial direction of the slot. After each scan the probe is indexed one quarter of the coil diameter. A total of 88 scans per slot is required for complete coverage, the time per slot being 20 min; with 40 slots the total inspection time per part is 14 hr when gain-calibration time is taken into account.

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Mon Jan 01 00:00:00 UTC 1996