Air-coupled ultrasonic testing of metal adhesively bonded joints using cellular polypropylene transducers

Gaal, Mate; Bartusch, Jürgen; Dohse, Elmar; Kreutzbruck, Marc; Amos, Jay M.

doi:10.1063/1.4864857

Cited by 9 publications

(3 citation statements)

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“…The other part of the test piece containing missing adhesive, constriction and kissing bonds was inspected using Type 1 focusing transducers. The missing adhesive and the constriction were easily detected with a good SNR, but the kissing bonds were not detected [13]. FIGURE 5.…”

Section: -4mentioning

confidence: 99%

Focusing of ferroelectret air-coupled ultrasound transducers

Gaal

Bartusch

Dohse

et al. 2016

AIP Conference Proceedings

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Section: -4mentioning

confidence: 99%

Focusing of ferroelectret air-coupled ultrasound transducers

Gaal

Bartusch

Dohse

et al. 2016

AIP Conference Proceedings

Self Cite

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“…This phased array has the advantages of low cost, simple fabrication, high flexibility, etc., achieving high resolution and high signal-to-noise ratio in textile testing. Moreover, FENG-based air-coupled ultrasonic transducers have demonstrated effective performance in nondestructive testing of metal adhesively bonded structures in the aerospace industry and lightweight structures [95,109].…”

Section: Nondestructive Testingmentioning

confidence: 99%

Leveraging Ferroelectret Nanogenerators for Acoustic Applications

Song,

Cai,

Wang

et al. 2023

Micromachines

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Ferroelectret nanogenerator (FENG), renowned for its remarkable electromechanical conversion efficiency and low Young’s modulus, has gained significant attention in various acoustic applications. The increasing interest is attributed to the crucial role acoustic devices play in our daily lives. This paper provides a comprehensive review of the advancements made in using FENG for acoustic applications. It elaborates on the operational mechanism of FENG in acoustics, with a special focus on comparing the influence of different fabrication materials and techniques on its properties. This review categorizes acoustic applications of FENG into three primary areas: acoustic sensing, acoustic actuation, and acoustic energy harvesting. The detailed descriptions of FENG’s implementations in these areas are provided, and potential directions and challenges for further development are outlined. By demonstrating the wide range of potential applications for FENG, it is shown that FENG can be adapted to meet different individual needs.

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“…With air-coupled ultrasonic testing being increasingly used in automotive and aerospace inspection applications, many groups currently develop new air-coupled transducers, providing larger bandwidths and higher sensitivity. Recent research was performed on the electromechanical response of polypropylene ferroelectret transducers [4], air-coupled cellular polypropylene transducers as mentioned in [5], as well as the resonance-free measuring and excitation of ultrasound [6].…”

Section: Introductionmentioning

confidence: 99%

Non-contact inline monitoring of thermoplastic CFRP tape quality using air-coupled ultrasound

Essig¹,

Fey²,

Meiler³

et al. 2017

AIP Conference Proceedings

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Abstract.Beginning with the aerospace industry, fiber reinforced plastics have spread towards many applications such as automotive, civil engineering as well as sports and leisure articles. Their superior strength and stiffness to mass ratio made them the number one material for achieving high performance. Especially continuous fiber reinforced plastics allow for the construction of structures which are custom tailored to their mechanical loads by adjusting the paths of the fibers to the loading direction. The two main constituents of CFRP are carbon fibers and matrix. Two possibilities for matrix material exist: thermosetting and thermoplastic matrix. While thermosetting matrix may yield better properties with respect to thermal loads, thermoplasticity opens a wide range of applications due to weldability, shapeability, and compatibility to e.g. injection molded thermoplastic materials. Thin (0.1 mm) thermoplastic continuous fiber CFRP tapes with a width of 100 mm were examined using air-coupled ultrasound. Transducers were arranged in reflection as well as transmission setup. By slanted incidence of the ultrasound on the tape surface, guided waves were excited in the material in fiber direction and perpendicular to the fiber direction. Artificial defects -fiber cuts, matrix cuts, circular holes, low velocity impacts from tool drop, and sharp bends -were produced. Experiments on a stationary tape showed good detectability of all artificial defects by guided waves. Also the effects of variation in material properties, fiber volume content and fiber matrix adhesion being the most relevant, on guided wave propagation were examined, to allow for quality assessment. Guided wave measurements were supported by destructive analysis. Also an apparatus containing one endless loop of CFRP tape was constructed and built to simulate inline testing of CFRP tapes, as it would be employed in a CFRP tape production environment or at a CFRP tape processing facility. The influences of tape conveying speed on detectability of artificial defects as well as material properties were elaborated and recommendations for implementation in production scale inline monitoring are given.

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Air-coupled ultrasonic testing of metal adhesively bonded joints using cellular polypropylene transducers

Cited by 9 publications

References 0 publications

Focusing of ferroelectret air-coupled ultrasound transducers

Focusing of ferroelectret air-coupled ultrasound transducers

Leveraging Ferroelectret Nanogenerators for Acoustic Applications

Non-contact inline monitoring of thermoplastic CFRP tape quality using air-coupled ultrasound

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