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Detection of disbond initiation and growth in a bonded joint using a chirped fibre Bragg grating sensor

Detection of disbond initiation and growth in a bonded joint using a chirped fibre Bragg grating sensor
Detection of disbond initiation and growth in a bonded joint using a chirped fibre Bragg grating sensor
Chirped fibre Bragg grating (CFBG) sensors have been used to monitor the initiation and propagation of disbonds in composite/metal bonded joints. The CFBGs were embedded in the glass fibre reinforced plastic (GFRP) adherend of GFRP/aluminium single lap joints (SLJs), which were bonded at elevated temperature. Cooling a SLJ to room temperature resulted in a residual elastic strain due to the different coefficients of thermal expansion of the adherends. SLJs were fatigue loaded, with the CFBG sensor being interrogated at intervals using a broadband light source and a spectrum analyser when the SLJ was in an unloaded state. It was found that the relaxation of the elastic strain due to disbonding caused perturbations in the reflected spectrum from the CFBG sensors which enabled the position of the disbond front to be determined. The experimental results have been modelled using a combination of finite-element analysis and commercial software for predicting FBG spectra.
Capell, Tobias F.
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Ogin, Stephen L.
6729e28c-b11f-487c-8c76-775124ccd701
Crocombe, Andrew D.
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Reed, Graham T.
ca08dd60-c072-4d7d-b254-75714d570139
Thorne, Anthony M.
de589c59-2ad9-43fc-a075-edb111718f73
Palaniappan, Jayanthi
f6f04f51-2ac1-4421-b71e-4bc9ccf9ad3e
Tjin, Swee Chuan
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Mohanty, Lipi
0846f38e-6fba-4df5-9a97-090da853adfd
Capell, Tobias F.
fce11056-ebbb-4cb8-a3ac-6b25f1f79dc2
Ogin, Stephen L.
6729e28c-b11f-487c-8c76-775124ccd701
Crocombe, Andrew D.
09c39b27-f6e3-4d86-945f-94c7be44945d
Reed, Graham T.
ca08dd60-c072-4d7d-b254-75714d570139
Thorne, Anthony M.
de589c59-2ad9-43fc-a075-edb111718f73
Palaniappan, Jayanthi
f6f04f51-2ac1-4421-b71e-4bc9ccf9ad3e
Tjin, Swee Chuan
507fa0fe-4697-4799-abe4-740a97ca5056
Mohanty, Lipi
0846f38e-6fba-4df5-9a97-090da853adfd

Capell, Tobias F., Ogin, Stephen L., Crocombe, Andrew D., Reed, Graham T., Thorne, Anthony M., Palaniappan, Jayanthi, Tjin, Swee Chuan and Mohanty, Lipi (2007) Detection of disbond initiation and growth in a bonded joint using a chirped fibre Bragg grating sensor. 16th International Conference on Composite Materials (ICCM-16), Kyoto, Japan. 08 - 13 Jul 2007. 7 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Chirped fibre Bragg grating (CFBG) sensors have been used to monitor the initiation and propagation of disbonds in composite/metal bonded joints. The CFBGs were embedded in the glass fibre reinforced plastic (GFRP) adherend of GFRP/aluminium single lap joints (SLJs), which were bonded at elevated temperature. Cooling a SLJ to room temperature resulted in a residual elastic strain due to the different coefficients of thermal expansion of the adherends. SLJs were fatigue loaded, with the CFBG sensor being interrogated at intervals using a broadband light source and a spectrum analyser when the SLJ was in an unloaded state. It was found that the relaxation of the elastic strain due to disbonding caused perturbations in the reflected spectrum from the CFBG sensors which enabled the position of the disbond front to be determined. The experimental results have been modelled using a combination of finite-element analysis and commercial software for predicting FBG spectra.

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More information

Published date: July 2007
Venue - Dates: 16th International Conference on Composite Materials (ICCM-16), Kyoto, Japan, 2007-07-08 - 2007-07-13
Organisations: Optoelectronics Research Centre, Photonic Systems Circuits & Sensors, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 50656
URI: https://eprints.soton.ac.uk/id/eprint/50656
PURE UUID: 61dbb52d-d987-4d69-b157-3d8142e576d5

Catalogue record

Date deposited: 10 Mar 2008
Last modified: 17 Oct 2018 16:31

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Contributors

Author: Tobias F. Capell
Author: Stephen L. Ogin
Author: Andrew D. Crocombe
Author: Graham T. Reed
Author: Anthony M. Thorne
Author: Jayanthi Palaniappan
Author: Swee Chuan Tjin
Author: Lipi Mohanty

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