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The use of a CFBG fibre optical sensor to detect disbond development in composite/composite and metal/composite adhesively bonded joints

The use of a CFBG fibre optical sensor to detect disbond development in composite/composite and metal/composite adhesively bonded joints
The use of a CFBG fibre optical sensor to detect disbond development in composite/composite and metal/composite adhesively bonded joints
This paper describes a novel technique to monitor disbond initiation and propagation in both composite-composite and metal-composite adhesively bonded joints using chirped fibre Bragg grating (CFBG) sensors embedded within fibre-reinforced composite adherends. Characteristic changes in the reflected spectra from the sensors indicate both (a) disbond initiation (due, for example, to fatigue loading) and (b) the current position of the disbond front (to within about 2 mm). For composite-composite bonded joints, the reflected spectra are recorded with the joint under a small load (in practice, this could be the self-weight of the structure). In the case of a metal-composite joint, the difference in the coefficient of thermal expansion between the adherends is sufficient to enable disbond propagation to be monitored when the joint is unloaded. The experimental results have been modelled using a combination of finite-element analysis and commercial software for predicting FBG spectra, with very good agreement between the experimental observations of the reflected spectra and the predicted spectra, for disbonds of different lengths.
Ogin, S.L.
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Palaniappan, J.
b5cef093-6621-4904-9b47-1ad11c954139
Capell, T.F.
e8334144-2ff4-4559-be46-cf7f23092802
Thorne, A.M.
4a7e0ab8-c6c3-406d-8958-5bc6f990d611
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Crocombe, A.D.
ecc8a655-260f-4625-90de-2df89503094e
Tjin, S.C.
2986cfba-d4ac-4c64-95d3-84093745a566
Mohanty, L.
00a4fe8f-2016-40cc-b59a-d03aca681215
Ogin, S.L.
6067d51e-8785-4e60-96a6-05038f6a0d31
Palaniappan, J.
b5cef093-6621-4904-9b47-1ad11c954139
Capell, T.F.
e8334144-2ff4-4559-be46-cf7f23092802
Thorne, A.M.
4a7e0ab8-c6c3-406d-8958-5bc6f990d611
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Crocombe, A.D.
ecc8a655-260f-4625-90de-2df89503094e
Tjin, S.C.
2986cfba-d4ac-4c64-95d3-84093745a566
Mohanty, L.
00a4fe8f-2016-40cc-b59a-d03aca681215

Ogin, S.L., Palaniappan, J., Capell, T.F., Thorne, A.M., Reed, G.T., Crocombe, A.D., Tjin, S.C. and Mohanty, L. (2007) The use of a CFBG fibre optical sensor to detect disbond development in composite/composite and metal/composite adhesively bonded joints. Optical Fibres and Optoelectronics Measurement Conference (OFMC 2007), Teddington, United Kingdom. 15 - 17 Oct 2007. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper describes a novel technique to monitor disbond initiation and propagation in both composite-composite and metal-composite adhesively bonded joints using chirped fibre Bragg grating (CFBG) sensors embedded within fibre-reinforced composite adherends. Characteristic changes in the reflected spectra from the sensors indicate both (a) disbond initiation (due, for example, to fatigue loading) and (b) the current position of the disbond front (to within about 2 mm). For composite-composite bonded joints, the reflected spectra are recorded with the joint under a small load (in practice, this could be the self-weight of the structure). In the case of a metal-composite joint, the difference in the coefficient of thermal expansion between the adherends is sufficient to enable disbond propagation to be monitored when the joint is unloaded. The experimental results have been modelled using a combination of finite-element analysis and commercial software for predicting FBG spectra, with very good agreement between the experimental observations of the reflected spectra and the predicted spectra, for disbonds of different lengths.

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More information

Submitted date: October 2007
Published date: 17 October 2007
Venue - Dates: Optical Fibres and Optoelectronics Measurement Conference (OFMC 2007), Teddington, United Kingdom, 2007-10-15 - 2007-10-17
Organisations: Optoelectronics Research Centre, Photonic Systems Circuits & Sensors, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 50657
URI: https://eprints.soton.ac.uk/id/eprint/50657
PURE UUID: 70061535-42f3-4220-9af0-b20940d5c0d4

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Date deposited: 10 Mar 2008
Last modified: 29 Nov 2019 17:36

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Contributors

Author: S.L. Ogin
Author: J. Palaniappan
Author: T.F. Capell
Author: A.M. Thorne
Author: G.T. Reed
Author: A.D. Crocombe
Author: S.C. Tjin
Author: L. Mohanty

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