Detection of kissing bonds by Lamb waves

Kundu, Tribikram; Maji, Arup; Ghosh, T.; Maslov, Konstantin

doi:10.1016/s0041-624x(97)00095-4

Cited by 97 publications

(49 citation statements)

References 14 publications

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“…1 Since GWs are influenced by the mechanical boundary conditions of the guiding structure, they can sense modifications at its interfaces or surfaces. This capacity has been used, e.g., to determine the quality of adhesive bonds 2 and to inspect composite materials such as aircraft parts. 3 Ultrasonic NDT benefits from rapid methods that are sensitive and that provide access to hard-to-reach sites.…”

Section: Introductionmentioning

confidence: 99%

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Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning

Karppinen

Salmi

Moilanen

et al. 2013

Journal of Applied Physics

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(2013). Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning. Journal of Applied Physics, 113 (14) Selecting and tuning modes are useful in ultrasonic guided wave non-destructive testing (NDT) since certain modes at various center frequencies are sensitive to specific types of defects. Ideally one should be able to select both the mode and the center frequency of the launched waves. We demonstrated that an affordable laser diode array can selectively launch either the S 0 or A 0 ultrasonic wave mode at a chosen center frequency into a polymer plate. A fiber-coupled diode array (4 elements) illuminated a 2 mm thick acrylic plate. A predetermined time delay matching the selected mode and frequency was employed between the output of the elements. The generated ultrasound was detected by a 215 kHz piezo receiver. Our results imply that this array permits non-contacting guided wave ultrasonic NDT. The solution is small, affordable, and robust in comparison to conventional pulsed lasers. In addition, it does not require experienced operators. V C 2013 AIP Publishing LLC.[http://dx

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Section: Introductionmentioning

confidence: 99%

“…Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning Pasi Karppinen, 1,a),b) Ari Salmi, 1,a) Petro Moilanen, 2 Timo Karppinen, 1 Zuomin Zhao, 3 Risto Myllyl € a, 3 Jussi Timonen, 2 and Edward Haeggstr € om…”

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confidence: 99%

Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning

Karppinen

Salmi

Moilanen

et al. 2013

Journal of Applied Physics

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“…[8,9] Recently, emphasis has been given on detecting a lack of adhesion at the interface, "kissing bonds" or "weak bonds", since the mere detection of voids prove to be insufficient to guarantee good bond quality. [10] Different techniques have been investigated such as ultrasonic techniques, [11][12][13][14] thermography, [15,16] digital image correlation, [17] dynamic response [18] etc. Results show the dependency on compressive loads for the detectability through ultrasonic techniques [19] and the potential of nonlinearity shown when "weak bonds" are illuminated with ultrasound.…”

Section: Introductionmentioning

confidence: 99%

The use of acoustic emission and composite peel tests to detect weak adhesion in composite structures

Freitas

Zarouchas

Poulis

2018

The Journal of Adhesion

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Adhesive bonding is one of the most promising joining technologies for composite aircraft. However, to comply with current aircraft certification rules, current safety-critical bonded joints, in which at least one of the interfaces requires additional surface preparation, are always used in combination with redundant mechanical fasteners, such as rivets and bolts. This lack of trust in bonded structures is mostly linked to the fear of lack of adhesion or a "weak bond".The aim of this paper is to tackle this challenge by assessing the ability to use composite peel tests and acoustic emission (AE) technique to assess adhesion quality and distinguish a good bond quality from a "weak bond".Composite Bell Peel (CBP) tests and Double-CantileverBeam (DCB) tests were performed on contaminated and noncontaminated CFRP bonded specimens. The results show that peel strength drops significantly at the location of the contaminated interface that has led to weak adhesion, as a result from adhesive failure. The AE signals obtained during DCB tests show different features for cracks growing at the interface ("weak bonds") and inside the adhesive layer (cohesive failure). In addition to this, scattering of the AE signals were observed in the contaminated specimens with "weak bonds". ARTICLE HISTORY

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“…Conventional ultrasonic testing for detecting a crack uses ultrasonic waves reflected at crack surfaces. However, it is difficult to detect a closed crack by this conventional method, because ultrasonic waves can propagate through a closed crack [1].…”

Section: Introductionmentioning

confidence: 99%

Generation of low-frequency components in ultrasonic waves penetrating the interface between contacting solids

Tanaka¹,

Okamoto²,

Kurihara³

et al. 2014

AIP Conference Proceedings

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It is difficult to detect a closed crack by conventional ultrasonic testing. However, nonlinear ultrasonics may be useful for detection of a closed crack in structures. This study experimentally examined propagation of ultrasonic waves through the interface between contacting solids. We simulated a closed crack by compressing two aluminum blocks. The input frequency was changed in the range of 1.0-2.0MHz and two different types of surface roughness of specimens were used. As a result, generation of low-frequency components at about 600 kHz was found regardless of the input frequency. Such a feature of low-frequency components is different from that of subharmonics. Additionally, this phenomenon was not confirmed in specimens with smoother surface. Therefore, surface roughness can be one of important factors of generating low-frequency components. The results suggest that these low-frequency components can be useful for detecting a closed crack.

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Detection of kissing bonds by Lamb waves

Cited by 97 publications

References 14 publications

Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning

Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning

The use of acoustic emission and composite peel tests to detect weak adhesion in composite structures

Generation of low-frequency components in ultrasonic waves penetrating the interface between contacting solids

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