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Appl. Sci. 2016, 6(1), 12; doi:10.3390/app6010012

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

1
Cardiff School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
2
Airbus UK Ltd., Filton, Bristol BS99 7AR, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Dimitrios G. Aggelis
Received: 24 November 2015 / Revised: 18 December 2015 / Accepted: 22 December 2015 / Published: 7 January 2016
(This article belongs to the Special Issue Acoustic and Elastic Waves: Recent Trends in Science and Engineering)
View Full-Text   |   Download PDF [4245 KB, uploaded 7 January 2016]   |  

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. View Full-Text
Keywords: lamb waves; vibrometry; adhesive bonding; ultrasonics; non-destructive testing; structural health monitoring lamb waves; vibrometry; adhesive bonding; ultrasonics; non-destructive testing; structural health monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Marks, R.; Clarke, A.; Featherston, C.; Paget, C.; Pullin, R. Lamb Wave Interaction with Adhesively Bonded Stiffeners and Disbonds Using 3D Vibrometry. Appl. Sci. 2016, 6, 12.

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