Automated Eddy Current Detection of Flaws in Shot-Peened Titanium Materials

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1995
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Ko, Ray
Pipenberg, Stephen
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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

Shot-peening metal products is a very common manufacturing practice for various reasons. Shot-peening provides fatigue crack resistance, friction, lubrication, wear and surface finishing. Shot-peened surfaces are also found on many areas on gas turbine engine disks. The rough surfaces caused by the shot-peening process often makes the eddy current inspection of engine disks difficult. This is because the signals from rough surfaces often give strong background readings. In addition to this noisy background due to shot-peened surfaces, the background signals due to the titanium grain structure also makes the inspection complicated. Ko, Xu and Birx [1] used several innovative signal processing techniques to enhance the defect detection in Ti-6A1-4V material, but these techniques are not adequate when the titanium material is heavily shot-peened. De La Pintiere [2] used a multiparameter technique to examine the OD defect of a heat exchanger tube in the presence of ID pilgering noise. The research of the defect inspection on shot-peened surfaces, however, seems sporadic. The purpose of this study is to examine the effect of shot-peened surfaces on eddy current signals at different inspection frequencies and its effect on a titanium engine disk inspection in an automated test environment.

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Sun Jan 01 00:00:00 UTC 1995