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Structural health monitoring of bonded composite joints using embedded chirped fibre Bragg gratings

Structural health monitoring of bonded composite joints using embedded chirped fibre Bragg gratings
Structural health monitoring of bonded composite joints using embedded chirped fibre Bragg gratings
Chirped fibre Bragg gratings (CFBGs) have been used to monitor disbond initiation and disbond growth in composite bonded joints. The CFBGs have been embedded within, but near the surface of, a transparent GFRP composite adherend that has been bonded to a second transparent adherend. The low wavelength end of the CFBGs has been arranged to be adjacent to the end of the first adherend. Disbond initiation is readily detected as a modification to the reflected spectrum of the CFBG, consisting of the low wavelength part of the reflected spectrum being shifted to lower wavelengths; this is due to the unloading of the adherend resulting from the disbond. Disbond growth is detected by the movement of a dip in the reflected spectrum of the CFBG (as a consequence of the load redistribution at the disbond front); this dip moves to higher wavelengths as the disbond propagates. The relationship between the shift of the dip in the reflected spectrum with the position of the disbond front has been determined directly through the use of transparent GFRP joints.
0963-6935
185-192
Palaniappan, J.
b5cef093-6621-4904-9b47-1ad11c954139
Wang, H.
d23f04f1-a300-4744-bd98-2df77c7047df
Ogin, S.L.
6067d51e-8785-4e60-96a6-05038f6a0d31
Thorne, A.
0b4e3808-7cba-412a-8c16-5b327705bac0
Reed, Graham
ca08dd60-c072-4d7d-b254-75714d570139
Crocombe, A.D.
ecc8a655-260f-4625-90de-2df89503094e
Tjin, S.C.
2986cfba-d4ac-4c64-95d3-84093745a566
Palaniappan, J.
b5cef093-6621-4904-9b47-1ad11c954139
Wang, H.
d23f04f1-a300-4744-bd98-2df77c7047df
Ogin, S.L.
6067d51e-8785-4e60-96a6-05038f6a0d31
Thorne, A.
0b4e3808-7cba-412a-8c16-5b327705bac0
Reed, Graham
ca08dd60-c072-4d7d-b254-75714d570139
Crocombe, A.D.
ecc8a655-260f-4625-90de-2df89503094e
Tjin, S.C.
2986cfba-d4ac-4c64-95d3-84093745a566

Palaniappan, J., Wang, H., Ogin, S.L., Thorne, A., Reed, Graham, Crocombe, A.D. and Tjin, S.C. (2005) Structural health monitoring of bonded composite joints using embedded chirped fibre Bragg gratings. Advanced Composites Letters, 14 (6), 185-192. (doi:10.1177/096369350501400601).

Record type: Article

Abstract

Chirped fibre Bragg gratings (CFBGs) have been used to monitor disbond initiation and disbond growth in composite bonded joints. The CFBGs have been embedded within, but near the surface of, a transparent GFRP composite adherend that has been bonded to a second transparent adherend. The low wavelength end of the CFBGs has been arranged to be adjacent to the end of the first adherend. Disbond initiation is readily detected as a modification to the reflected spectrum of the CFBG, consisting of the low wavelength part of the reflected spectrum being shifted to lower wavelengths; this is due to the unloading of the adherend resulting from the disbond. Disbond growth is detected by the movement of a dip in the reflected spectrum of the CFBG (as a consequence of the load redistribution at the disbond front); this dip moves to higher wavelengths as the disbond propagates. The relationship between the shift of the dip in the reflected spectrum with the position of the disbond front has been determined directly through the use of transparent GFRP joints.

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More information

Published date: November 2005
Organisations: Optoelectronics Research Centre, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 50287
URI: https://eprints.soton.ac.uk/id/eprint/50287
ISSN: 0963-6935
PURE UUID: ea9d3f6c-12b3-4607-a910-da3a84f3e09b

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Date deposited: 12 Feb 2008
Last modified: 19 Mar 2019 17:30

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Contributors

Author: J. Palaniappan
Author: H. Wang
Author: S.L. Ogin
Author: A. Thorne
Author: Graham Reed
Author: A.D. Crocombe
Author: S.C. Tjin

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