Discussion on the equivalent conductivity and resistance of stress corrosion cracks in eddy current simulations

Yusa, Noritaka; Miya, Kenzo

doi:10.1016/j.ndteint.2008.09.007

Cited by 31 publications

(10 citation statements)

References 12 publications

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“…ECT is also used to evaluate defects in various other environments and configurations [14]. These include flaws in steam generator tubes [18][19][20][21][22][23], fatigue cracks [24][25][26], corrosion [27][28][29][30][31][32][33], material microstructure near welds [34], and estimation of pearlite percentages in plain carbon steels [35,36] and in cast irons [37]. High density eddy current C-Scan data has also been used for the analysis of bolt hole eddy current [38] and estimation of micro-crack lengths [39].…”

Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno¹,

Underhill²,

Krause³

et al. 2017

Preprint

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Surface damage on honeycomb aircraft panels is often measured manually, and is therefore subject to variation based on inspection personnel. Eddy current testing (ECT) is sensitive to variations in probe-to-specimen spacing, or lift-off, and is thus promising for high resolution profiling of surface damage on aluminum panels. Lower frequency testing also allows inspection through the face sheet, an advantage over optical 3D scanning methods. This paper presents results from the ECT inspection of surface damage on an approximately flat aluminum honeycomb aircraft panel, and compares the measurements to those taken using optical 3D scanning technology. An ECT C-Scan of the dented panel surface was obtained by attaching the probe to a robotic scanning apparatus. Data was taken simultaneously at four frequencies of 25, 100, 400 and 1,600 kHz. A reference surface was then defined that approximated the original, undamaged panel surface, which also compensated for the effects of specimen tilt and thermal drift within the ECT instrument. Data was converted to lift-off using height calibration curves developed for each probe frequency. A damage region of 22,550 mm 2 area with dents ranging in depth from 0.13-1.01 mm was analyzed. The method was accurate at 1,600 kHz to within 0.05 mm (2σ) when compared with 231 measurements taken via optical 3D scanning. Testing at 25 kHz revealed a 3.2 mm cell size within the honeycomb core, which was confirmed via destructive evaluation. As a result, ECT demonstrates potential for implementation as a method for rapid in-field aircraft panel surface damage assessment.

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Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno¹,

Underhill²,

Krause³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…However, current studies had revealed that the accuracy of evaluation strongly depends on the crack modeling [47,[60][61][62]. In contrast, Hosseini and Lakis [63] used pulsed Eddy current to detect corrosion and cracks in multilayer aluminum structures in aircraft applications.…”

Section: Corrosionmentioning

confidence: 99%

“…The fast crack profile reconstruction methods using transient time and spectral components of PEC signals were carried out on EDM slots of 3 mm, 4 mm, 6 mm, 6 Advances in Mechanical Engineering [18][19][20][21][22][23] E m p l o y e d E C p r o b e s [27] EC probe mounted in a planar probe [28] Optimized EC array technique Fatigue crack [51] EC with operating frequency range between 200 Hz and 100 kHz [52] A uniform EC probe with 23 arrayed detectors [53] I n d u c t i o n P E C T [2,54,55] Eddy current [56] EC with an array probe [57] EC-giant magnetoresistive (EC-GMR) sensor system Corrosion [47,[58][59][60][61][62]71] Eddy current [63,72] P E C [66] Electromagnetic acoustic transducer-Eddy current (EMAT-EC) dual probe Material microstructure [67] Eddy current Estimation of pearlite [68][69][70] Eddy current and 8 mm depth [77]. The method provided initial approximate profiles for crack shape reconstruction using different PEC signals such as amplitude, phase, real and imaginary values of spectral components, and transient slices using reconstruction mean square errors (MSE) which reduces the computing time.…”

Section: Pulsed Eddy Current (Pec)mentioning

confidence: 99%

Defect Characterization Based on Eddy Current Technique: Technical Review

Ghoni

Dollah

Sulaiman

et al. 2014

Advances in Mechanical Engineering

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Eddy current testing is widely used for nondestructive evaluation of metallic structures in characterizing numerous types of defects occurring in various locations. It offers remarkable advantages over other nondestructive techniques because of its ease of implementation. This paper presents a technical review of Eddy current technique in various scope of defect detection. The first part presents Eddy current evaluation on various defects location and orientation such as steam generator tubes, stress crack corrosion, and fatigue cracks. The next section analyzes the use of pulsed Eddy current and pulsed Eddy current thermography as an alternative method for monitoring the growth of cracks with the aid of computational techniques for postsignal analysis.

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“…ECT is also used to evaluate defects in various other environments and configurations [ 14 ]. These include flaws in steam generator tubes [ 18 , 19 , 20 , 21 , 22 , 23 ], fatigue cracks [ 24 , 25 , 26 ], corrosion [ 27 , 28 , 29 , 30 , 31 , 32 , 33 ], material microstructure near welds [ 34 ], and the estimation of pearlite percentages in plain carbon steel [ 35 , 36 ] and in cast iron [ 37 ]. High-density eddy current C-Scan data has also been used for the analysis of bolt hole eddy current [ 38 ] and estimation of micro-crack lengths [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno

Underhill

Krause

et al. 2017

Sensors

View full text Add to dashboard Cite

Surface damage on honeycomb aircraft panels is often measured manually, and is therefore subject to variation based on inspection personnel. Eddy current testing (ECT) is sensitive to variations in probe-to-specimen spacing, or lift-off, and is thus promising for high-resolution profiling of surface damage on aluminum panels. Lower frequency testing also allows inspection through the face sheet, an advantage over optical 3D scanning methods. This paper presents results from the ECT inspection of surface damage on an approximately flat aluminum honeycomb aircraft panel, and compares the measurements to those taken using optical 3D scanning technology. An ECT C-Scan of the dented panel surface was obtained by attaching the probe to a robotic scanning apparatus. Data was taken simultaneously at four frequencies of 25, 100, 400 and 1600 kHz. A reference surface was then defined that approximated the original, undamaged panel surface, which also compensated for the effects of specimen tilt and thermal drift within the ECT instrument. Data was converted to lift-off using height calibration curves developed for each probe frequency. A damage region of 22,550 mm2 area with dents ranging in depth from 0.13–1.01 mm was analyzed. The method was accurate at 1600 kHz to within 0.05 mm (2σ) when compared with 231 measurements taken via optical 3D scanning. Testing at 25 kHz revealed a 3.2 mm cell size within the honeycomb core, which was confirmed via destructive evaluation. As a result, ECT demonstrates potential for implementation as a method for rapid in-field aircraft panel surface damage assessment.

show abstract

Discussion on the equivalent conductivity and resistance of stress corrosion cracks in eddy current simulations

Cited by 31 publications

References 12 publications

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Defect Characterization Based on Eddy Current Technique: Technical Review

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

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