Improved Probe-Flaw Interaction Modeling, Inversion Processing, and Surface Roughness Clutter

Auld, B. A.; McFetridge, G.; Riaziat, M.; Jefferies, Steven R.

doi:10.1007/978-1-4615-9421-5_69

Cited by 16 publications

(9 citation statements)

References 7 publications

(3 reference statements)

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“…The inversion procedure developed las t year [ 3 ] s t ar t ed from t he c oncept of a flaw profile : a plot of the magn itude or phase of ~Z along t he length of the flaw. The l ength of the fl aw is then determined from t he physical extent of the fl aw signal (ana l ogo us to imag ing) .…”

Section: Resultsmentioning

confidence: 99%

“…Following the development of the basic analysis for nonuniform probe fields [1], the first comparison of measured eddy current signals with predictions of the theory was made in 1983 [2]. The following year brought development of a full inversion procedure for rectangular flaws [3], which was successfully demonstrated using flaw signals measured for a series of rectangular electrical-discharge machined (EDM) notches in aluminum [4]. This year, in a companion paper [5], the model for interaction of nonuniform probe fields with flaws has been extended to semi-elliptical flaws.…”

mentioning

confidence: 99%

“…The twenty-two flaws studied included six fatigue cracks, eight semi-elliptical EDM notches, and eight rectangular EDM notches in three different materials: 6061 Ai, 7075 Ai, and Ti-6Ai-4V. Although the focus of this study was on semi-elliptical flaws, rectangular notches were included to permit comparisons of the numerical method developed this year [5] with last year's analytical solution for rectangular flaws [3]. Flaw types: F = fatigue crack, S = semi-elliptical EDM notch, R = rectangular EDM notch.…”

mentioning

confidence: 99%

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Semi-Elliptical Surface Flaw EC Interaction and Inversion: Experiment

Moulder

Gerlitz

Auld

et al. 1986

Review of Progress in Quantitative Nondestructive Evaluation

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During recent years, rapid progress has been made in modeling the interaction of nonuniform eddy-current (EC) probe fields with surface flaws and verifying these models by comparisons with experiment. Following the development of the basic analysis for nonuniform probe fields [1], the first comparison of measured eddy current signals with predictions of the theory was made in 1983 [2]. The following year brought development of a full inversion procedure for rectangular flaws [3], which was successfully demonstrated using flaw signals measured for a series of rectangular electrical-discharge machined (EDM) notches in aluminum [4]. This year, in a companion paper [5], the model for interaction of nonuniform probe fields with flaws has been extended to semi-elliptical flaws. The present paper describes an extensive series of measurements of flaw signals for both fatigue cracks and semi-elliptical EDM notches in aluminum and titanium alloys. The measured flaw signals are compared with theoretical predictions and are also used to test the inversion procedure based on the theory [5]. EXPERIMENTThe objective of this study was to make a serjes of carefully controlled measurements of eddy current flaw signals for well characterized, semielliptical flaws in aluminum and titanium alloys to compare with flaw signals calculated using theoretical models described in a companion paper [5]. Both real fatigue cracks and EDM simulations were studied. Most measurements emphasized air-core probes, since the magnetic field distributions for these probes could be calculated using the theory of Dodd and Deeds [6]. One * Contribution of the National Bureau of Standards, not subject to copyright.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Semi-Elliptical Surface Flaw EC Interaction and Inversion: Experiment

Moulder

Gerlitz

Auld

et al. 1986

Review of Progress in Quantitative Nondestructive Evaluation

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“…Namely, we repeat similar calculations for cracks of various aspect ratios at various frequencies, and plot the results together to form a so -called McFetridge chart (Fig. 4) [11]. When a measurement is made, one can get …”

Section: Numerical Resultsmentioning

confidence: 99%

Eddy-Current Detection Methods for Surface-Breaking Tight Cracks

Nakagawa

1989

Review of Progress in Quantitative Nondestructive Evaluation

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“…This approach is particularly useful for developing field inspection applications in nuclear steam generator tubing where the characterization of primary water stress corrosion cracking (PWSCC) has presented a challenge for eddy current inspection technology. Significant progress has been reported recently toward developing analytical models of the eddy current signal structure [4,5] and toward new techniques for inverting crack size from the eddy current signal structure. These models are presently limited in ability to represent real-life complexities, and they also must be experimentally validated.…”

Section: Introductionmentioning

confidence: 99%