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Lamb wave interaction with adhesively bonded stiffeners and disbonds using 3D vibrometry

Marks, Ryan, Clarke, Alastair, Featherston, Carol, Paget, Christophe and Pullin, Rhys 2016. Lamb wave interaction with adhesively bonded stiffeners and disbonds using 3D vibrometry. Applied Sciences 6 (1) , 12. 10.3390/app6010012

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Uncontrolled Keywords: lamb waves; vibrometry; adhesive bonding; ultrasonics; non-destructive testing; structural health monitoring
Publisher: MDPI
ISSN: 2076-3417
Funders: EPSRC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 22 December 2015
Last Modified: 22 May 2019 14:02
URI: http://orca.cf.ac.uk/id/eprint/84448

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