Model-Based Guided Wave NDE: The Evolution of Guided Wave NDE from “Magic” to “Physically Based Engineering Tool”

Cho, Younho

doi:10.1007/s10921-012-0151-y

Cited by 12 publications

(7 citation statements)

References 37 publications

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“…In practice, interest is focused on the case where the second harmonic generated grows with propagation distance, since the cumulative second harmonic plays a dominant role in the second-harmonics field after primary wave propagates a certain distance. [47] The symmetric (S) modes, anti-symmetric (A) modes, and symmetric DFLW (D) modes are shown in Fig. 7, where the phase velocity matching modes can be found in the crossing points.…”

Section: Shg Of Lamb Waves In An Isotropic Platementioning

confidence: 95%

“…(color online) Dispersion curves of primary Lamb waves and the symmetric DFLWs for a given aluminum plate with 1 mm thickness. [47] 4.3. SHG of Lamb waves in a layered planar structure SHG of Lamb wave propagation in a two-layered solid waveguide was studied by combining the modal analyses approach and the nonlinear reflection of acoustic waves at interfaces.…”

Section: Shg Of Lamb Waves In An Isotropic Platementioning

confidence: 99%

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Review on second-harmonic generation of ultrasonic guided waves in solid media (I): Theoretical analyses

Deng

Xiang

2017

Chinese Phys. B

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Considering the high sensitivity of the nonlinear ultrasonic measurement technique and great advantages of the guided wave testing method, the use of nonlinear ultrasonic guided waves provides a promising means for evaluating and characterizing the hidden and/or inaccessible damage/degradation in solid media. Increasing attention on the development of the testing method based on nonlinear ultrasonic guided waves is largely attributed to the theoretical advances of nonlinear guided waves propagation in solid media. One of the typical acoustic nonlinear responses is the generation of second harmonics that can be used to effectively evaluate damage/degradation in materials/structures. In this paper, the theoretical progress of second-harmonic generation (SHG) of ultrasonic guided wave propagation in solid media is reviewed. The advances and developments of theoretical investigations on the effect of SHG of ultrasonic guided wave propagation in different structures are addressed. Some obscure understandings and the ideas in dispute are also discussed.

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Section: Shg Of Lamb Waves In An Isotropic Platementioning

confidence: 95%

Section: Shg Of Lamb Waves In An Isotropic Platementioning

confidence: 99%

Review on second-harmonic generation of ultrasonic guided waves in solid media (I): Theoretical analyses

Deng

Xiang

2017

Chinese Phys. B

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“…In the last two decades substantial progress has been made in GW theory and application (Cho 2012). Guided wave SHM has been extensively researched for short (<1m), medium (about 5m) and long (about 100m) range applications (Cawley 2002).…”

Section: Manuscript -With Author Detailsmentioning

confidence: 99%

Long range guided waves for detecting holes in pipelines

El-Hussein

Harrigan²,

Starkey

2020

Journal of Structural Integrity and Maintenance

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Time domain trace of impulse hammer pulse recorded during the laboratory tests and (b) its corresponding frequency spectrum. Comparison of FE with test data (a) time domain signals and (b) corresponding frequency spectrum Comparison of FE and Lab test propagation characteristics (a) Wavenumber (b) Attenuation and (c) Phase velocity N1 N3 N2 Displacement signals and their corresponding FFT for pipe geometry and centre frequencies (a, b) 1 kHz (c, d) at 1.5 kHz and (e, f) 2.5 kHz Displacement signals and their corresponding FFT for pipe geometry and centre frequencies (a, b) 1 kHz (c, d) at 1.5 kHz and (e, f) 2.5 kHz Displacement signals and their corresponding FFT for pipe geometry and centre frequencies (a, b) 1 kHz (c, d) at 1.5 kHz and (e, f) 2.5 kHz Propagation characteristics at centre frequencies of 2.5 kHz (a) wavenumber (b) attenuation and (c) phase velocity as functions of frequency Attenuation of guided wave along a 12 in (305 mm) pipeline versus potential propagation distance at different centre frequencies Figure 5 (cd): Time and frequency domain displacement signals at 3 locations from (a, b) 6 in diameter pipe using 5 kHz centre frequency with 12 mm wall thickness and (c, Figure 10: Reflections from two inch diameter hole using 2.5 kHz centre frequencies (a) time domain signal and (b) corresponding spectrograph Long range guided waves for detecting holes in pipelines

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“…Inspecting an extended region generally requires multiple scans, moving the system in the two orthogonal directions x and y. Inspection by guided waves represents an exception to such rule, allowing defect detection in arbitrary positions even without moving the source or the detector; nevertheless, this typically applies to low thickness pieces like pipes or thin plates, in which SAWs typically travels a long path without significant attenuation [15,16].…”

Section: Introductionmentioning

confidence: 99%

Signal Enhancement in Surface Crack Detection with Gas-Coupled Laser Acoustic Detection

et al. 2021

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Ultrasonic signal enhancement resulting from constructive interference between direct Rayleigh waves and same waves reflected by a surface defect is exploited to increase crack identification capabilities of the Gas-Coupled Laser Acoustic Detection (GCLAD) non-contact detection technology. Highlights from simulations are provided regarding the interference phenomenon in the solid and its propagation in air, where GCLAD detection occurs. Experimental campaigns are preliminarily performed on a bar to evidence the effect of cracks on the GCLAD acquired signals. Then, a signal enhancement of +30% is reached on a plate, implying that defects are efficiently scanned by moving the GCLAD in proximity of the discontinuity. Since the GCLAD allows monitoring points of a piece belonging to the same line at once, its translation in one direction is sufficient to perform a two-dimensional scan, entailing reduction of inspection time and simple automation of the interrogation layout compared to other traditional or signal enhancement-based techniques.

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Model-Based Guided Wave NDE: The Evolution of Guided Wave NDE from “Magic” to “Physically Based Engineering Tool”

Cited by 12 publications

References 37 publications

Review on second-harmonic generation of ultrasonic guided waves in solid media (I): Theoretical analyses

Review on second-harmonic generation of ultrasonic guided waves in solid media (I): Theoretical analyses

Long range guided waves for detecting holes in pipelines

Signal Enhancement in Surface Crack Detection with Gas-Coupled Laser Acoustic Detection

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