Automated detection of delamination and disbond from wavefield images obtained using a scanning laser vibrometer

Sohn, Hoon; Dutta, Debaditya; Jy, Yang; DeSimio, Martin P.; Olson, Steven E.; Swenson, Eric D.

doi:10.1088/0964-1726/20/4/045017

Cited by 161 publications

(125 citation statements)

References 29 publications

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“…Out of plane measurements were taken by Sohn et al [34] using a 1D scanning laser vibrometer to measure Lamb wave interaction with delaminations in a composite plate after impact as well as Lamb wave interaction with a disbond of a composite spar. In this work, frequency-wavenumber domain and Laplacian image filters were placed over the wave field images to enhance imaging of the defect.…”

Section: Lamb Wave Measurement Using 3d Laser Vibrometrymentioning

confidence: 99%

Lamb Wave Interaction with Adhesively Bonded Stiffeners and Disbonds Using 3D Vibrometry

et al. 2016

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There are many advantages to adhesively bonding stiffeners onto aircraft structures rather than using traditional mechanical fastening methods. However there is a lack of confidence of the structural integrity of adhesively bonded joints over time. Acousto-ultrasonic Lamb waves have shown great potential in structural health monitoring applications in both metallic and composite structures. This paper presents an experimental investigation of the use of acousto-ultrasonic Lamb waves for the monitoring of adhesively bonded joints in metallic structures using 3D scanning laser vibrometry. Two stiffened panels were manufactured, one with an intentional disbonded region. Lamb wave interaction with the healthy and disbonded stiffeners was investigated at three excitation frequencies. A windowed root-mean-squared technique was applied to quantify where Lamb wave energy was reflected, attenuated and transmitted across the structure enabling the size and shape of the defect to be visualised which was verified by traditional ultrasonic inspection techniques.

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Section: Lamb Wave Measurement Using 3d Laser Vibrometrymentioning

confidence: 99%

Lamb Wave Interaction with Adhesively Bonded Stiffeners and Disbonds Using 3D Vibrometry

et al. 2016

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“…Many wavefield imaging studies utilizing guided waves have noted the interaction of guided waves with various types of defects such as cracks [15], corrosion [16], and impact damage [17]. Researchers in the area of structural health monitoring (SHM), also referred to as in situ NDE, are proposing arrays of permanently attached transducers to continuously monitor critical structures using guided waves [18,19], and wavefield imaging has greatly contributed to the understanding of how such waves interact with damage.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic wavefield imaging: Research tool or emerging NDE method?

Michaels¹

2017

AIP Conference Proceedings

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Multi-site delamination detection and quantification in composites through guided wave based global-local sensing AIP Conference Proceedings 1806, 020007 (2017) Abstract. Ultrasonic wavefield imaging refers to acquiring full waveform data over a region of interest for waves generated by a stationary source. Although various implementations of wavefield imaging have existed for many years, the widespread availability of laser Doppler vibrometers that can acquire signals in the high kHz and low MHz range has resulted in a rapid expansion of fundamental research utilizing full wavefield data. In addition, inspection methods based upon wavefield imaging have been proposed for standalone nondestructive evaluation (NDE) with most of these methods coming from the structural health monitoring (SHM) community and based upon guided waves. If transducers are already embedded in or mounted on the structure as part of an SHM system, then a wavefield-based inspection can potentially take place with very little required disassembly. A frequently-proposed paradigm for wavefield NDE is its application as a follow-up inspection method using embedded SHM transducers as guided wave sources if the in situ SHM system generates an alarm. Discussed here is the broad role of wavefield imaging as it relates to ultrasonic NDE, both as a research tool and as an emerging NDE method. Examples of current research are presented based upon both guided and bulk wavefield imaging in metals and composites, drawing primarily from the author's work. Progress towards wavefield NDE is discussed in the context of defect detection and characterization capabilities, scan times, data quality, and required data analysis. Recent research efforts are summarized that can potentially enable wavefield NDE.

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“…In recent years, full time-space wavefields of guided waves, measured by non-contact laser Doppler vibrometers, have been extensively studied for use in damage detection [6][7][8][9][10][11][12]. The various methods developed to process full wavefield data for damage detection include: amplitude based imaging, wave filtering based imaging, and wavenumber based imaging, among others [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Wavenumber based imaging uses intrinsic wavenumber information obtained from the full wavefields for quantitative evaluation of the defects in metals and laminated composites [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Multi-site delamination detection and quantification in composites through guided wave based global-local sensing

Tian¹,

Leckey²,

Yu³

2017

AIP Conference Proceedings

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Abstract. This paper presents a guided wave based global-local sensing method for rapid detection and quantification of multi-site delamination damage in large composite panels. The global-local approach uses a hybrid system consisting of a piezoelectric transducer (PZT) for generating guided waves and a non-contact scanning laser Doppler vibrometer (SLDV) for acquiring guided wave data. The global-local method is performed in two steps. First, a phased array configured of a small number of SLDV scan points (for example 10×10 points in a rectangular grid array) performs inspection over the entire plate to detect and locate damage. Local areas are identified as potential damage regions for the second step. Then high density wavefield measurements are taken over the identified areas and wavefield analysis is performed to quantitatively evaluate the damage. For the proof of concept in case with multi-site damage, the global-local approach is demonstrated on a carbon fiber reinforced polymer (CFRP) composite plate with two sites of impact-induced delamination damage. In the first step, the locations of two delamination sites are detected by the phased array method. In the second step, the delamination size and shape are evaluated using wavefield analysis. The detected delamination location, size and shape agree well with those of ultrasonic C-scan and the method led to a 93% reduction in inspection time compared to a full SLDV dense grid scan.

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Automated detection of delamination and disbond from wavefield images obtained using a scanning laser vibrometer

Cited by 161 publications

References 29 publications

Lamb Wave Interaction with Adhesively Bonded Stiffeners and Disbonds Using 3D Vibrometry

Lamb Wave Interaction with Adhesively Bonded Stiffeners and Disbonds Using 3D Vibrometry

Ultrasonic wavefield imaging: Research tool or emerging NDE method?

Multi-site delamination detection and quantification in composites through guided wave based global-local sensing

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