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On the use of a CFBG sensor to monitor scarf repairs of composite panels

Rito, RL, Ogin, SL, Crocombe, AD, Capell, TF, Sanderson, AR, Guo, Y, Tjin, SC and Lin, B (2012) On the use of a CFBG sensor to monitor scarf repairs of composite panels In: Fifth Conference on Emerging Technologies in Non-Destructive Testing, 2011-09-19 - 2011-09-21, Ioannina, Greece.

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Scarf repairs are often used for damaged composite structures in order to recover the mechanical properties of the original structure. During service, there is the possibility that damage will occur in the repaired region and hence it would be useful to be able to monitor such repairs. This work investigates the use of chirped fibre Bragg grating (CFBG) sensors to monitor the development of damage initiation and growth in the repaired region. The experimental part of the work uses a model system consisting of a scarf-repaired, transparent GFRP beam. During fatigue loading, damage in the form of cracks initiate at the interface between the scarf-repair and the parent material on the tensile face of the beam, and grows within this region. The modulus reduction as a consequence of crack growth has been monitored and finite-element analysis (FEA) has been used to predict this reduction, with reasonable agreement between experiment and modelling. Using the FEA analysis, predictions have been made of the strain changes in the vicinity of the growing damage and the effect that these would have on reflected spectra recorded by a chirped fibre Bragg grating sensor bonded across the scarf repair. The predictions suggest that as the damage develops within the scarf repair, the strain changes will modify the reflected spectra in such a way that the initiation of damage can be detected and the growth of fatigue cracks associated with the scarf repair can be monitored. The predictions are in good qualitative agreement with experimental results. © 2012 Taylor & Francis Group, London.

Item Type: Conference or Workshop Item (Paper)
Additional Information: This is an Author's Accepted Manuscript of an article published in Emerging Technologies in Non-Destructive Testing V 2012, copyright CRC Press, Taylor & Francis.
Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 05 Oct 2012 16:04
Last Modified: 23 Sep 2013 19:39

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