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Title: On the use of surface-mounted CFBG sensors for monitoring damage within composite structures
Author: Sanderson, Andrew Roy
Awarding Body: University of Surrey
Current Institution: University of Surrey
Date of Award: 2013
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Composite materials are increasingly -used in many different applications. However, the use of composite materials introduces different failure modes. Delamination within, and disbanding of, composite structures are types of damage which can lead to failure of the structure, and therefore in-situ monitoring of such damage is of increasing importance. In this thesis, the use of surface-mounted chirped fibre Bragg grating (CFBG) sensors is investigated; these sensors can be installed at any point in the life of a structure to monitor delamination or disbanding. The work began by using a CFBG sensor bonded to the surface of a unidirectional GFRP double' cantilever beam (DCB) specimen to show that it is possible to identify the location, and monitor the 'growth, of a delamination. A dip in the spectra reflected by the sensor indicated the approximate location of the delamination front. Analysis and refinement of the technique allowed the location of the delamination front to be identified to within four millimetres. The same approach was developed for a bonded composite DCB specimen. The reflected spectra showed smaller dips than seen previously and required a signal processing technique to be developed, enabling the location of the disband to be identified to within about four millimetres.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available