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Proceedings Paper

Embedded fiber Bragg grating as local damage sensors for composite materials
Author(s): J. Alfredo Guemes; M. Frovel; Fernando Rodriguez-Lence; Jose Manuel Menendez Martin
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Paper Abstract

Airbus Espana, INTA and UPM are collaborating in a joint research directed to increase their experience and the knowledge in the use of fiber Bragg gratings as strain and damage sensors in advanced composite structures for aerospace applications. In certain conditions, fiber Bragg gratings are able to detect damage by measuring sudden changes in the strain distribution of composite monolithic structures due to delaminations or debonding of stiffening elements. However, strain measurement of FBGs can be compromised by spurious phenomena like birefringence promoted by manufacturing induced residual stresses, with the subsequent spectral peak splitting, and spectral chirping induced by local non uniform strain fields. These effects add a new issue to the difficult task of demodulating the spectral response of fiber Bragg gratings when employed as strain sensors in composite structures. However, photoelastic models already developed allow obtaining considerable information about this phenomena, and relate them with local changes in the stress field promoted by structural damage. Thus, it is possible to think in FBGs not only as load monitoring sensors, but as a part of SHMS for composite structures designed under damage tolerance criteria.

Paper Details

Date Published: 27 June 2002
PDF: 11 pages
Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); doi: 10.1117/12.472609
Show Author Affiliations
J. Alfredo Guemes, Univ. Politecnica de Madrid (Spain)
M. Frovel, Instituto Nacional de Tecnica Aeroespacial (Spain)
Fernando Rodriguez-Lence, Airbus Espana (Spain)
Jose Manuel Menendez Martin, Airbus Espana (Spain)

Published in SPIE Proceedings Vol. 4694:
Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems
Daniele Inaudi; Eric Udd, Editor(s)

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