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NDE detection of manufacturing defects in composite bonded joints using CFBG sensors

NDE detection of manufacturing defects in composite bonded joints using CFBG sensors
NDE detection of manufacturing defects in composite bonded joints using CFBG sensors
This paper reports the use of chirped fibre Bragg grating (CFBG) sensors to detect defects introduced during the bonding of composite joints. The single-lap joints were made from transparent GFRP cross-ply composites which had a CFBG sensor embedded within one of the two adherends during the manufacturing stage. Joints with defects simulated using PTFE or introduced real air-gaps have been investigated. The sensors were interrogated with no load on the joints and also under a moderate quasi-static load. For the joints with PTFE “defects”, the perturbations observed in the reflected spectra provided a clear indication of the location of the defects and were in very good agreement with modelling predictions. Changes in the reflected spectra for the air-gap defects also provided an indication of the location of the defects and the spectrum changes were in reasonable agreement with modelling predictions. However, further work is required to establish the limitations of the technique for air-gap defects.
adhesively bonded joints, chirped fibre bragg grating, manufacturing defect, NDE testing.
Palaniappan, J.
b5cef093-6621-4904-9b47-1ad11c954139
Capell, T.F.
e8334144-2ff4-4559-be46-cf7f23092802
Ogin, S.
5662499c-9ef7-4f55-a58e-4e78c26adb63
Thorne, A.
0b4e3808-7cba-412a-8c16-5b327705bac0
Crocombe, A.
164691f9-e53e-4f37-bfaf-faab01527360
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Tjin, S.C.
2986cfba-d4ac-4c64-95d3-84093745a566
Mohanty, L.
00a4fe8f-2016-40cc-b59a-d03aca681215
Palaniappan, J.
b5cef093-6621-4904-9b47-1ad11c954139
Capell, T.F.
e8334144-2ff4-4559-be46-cf7f23092802
Ogin, S.
5662499c-9ef7-4f55-a58e-4e78c26adb63
Thorne, A.
0b4e3808-7cba-412a-8c16-5b327705bac0
Crocombe, A.
164691f9-e53e-4f37-bfaf-faab01527360
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Tjin, S.C.
2986cfba-d4ac-4c64-95d3-84093745a566
Mohanty, L.
00a4fe8f-2016-40cc-b59a-d03aca681215

Palaniappan, J., Capell, T.F., Ogin, S., Thorne, A., Crocombe, A., Reed, G.T., Tjin, S.C. and Mohanty, L. (2008) NDE detection of manufacturing defects in composite bonded joints using CFBG sensors. 13th European Conference on Composite Materials (ECCM13), Stockholm, Sweden. 02 - 05 Jun 2008. 2 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper reports the use of chirped fibre Bragg grating (CFBG) sensors to detect defects introduced during the bonding of composite joints. The single-lap joints were made from transparent GFRP cross-ply composites which had a CFBG sensor embedded within one of the two adherends during the manufacturing stage. Joints with defects simulated using PTFE or introduced real air-gaps have been investigated. The sensors were interrogated with no load on the joints and also under a moderate quasi-static load. For the joints with PTFE “defects”, the perturbations observed in the reflected spectra provided a clear indication of the location of the defects and were in very good agreement with modelling predictions. Changes in the reflected spectra for the air-gap defects also provided an indication of the location of the defects and the spectrum changes were in reasonable agreement with modelling predictions. However, further work is required to establish the limitations of the technique for air-gap defects.

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More information

Published date: 2008
Venue - Dates: 13th European Conference on Composite Materials (ECCM13), Stockholm, Sweden, 2008-06-02 - 2008-06-05
Keywords: adhesively bonded joints, chirped fibre bragg grating, manufacturing defect, NDE testing.
Organisations: Optoelectronics Research Centre, Photonic Systems Circuits & Sensors, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 54928
URI: https://eprints.soton.ac.uk/id/eprint/54928
PURE UUID: b4de1c0f-f0dc-4494-a65f-5f44ade026f2

Catalogue record

Date deposited: 04 Aug 2008
Last modified: 16 Oct 2018 16:31

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Contributors

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

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