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Proceedings Paper

Finite element modelling of fibre Bragg grating strain sensors and experimental validation
Author(s): Shoaib A. Malik; Ramani S. Mahendran; Dee Harris; Mark Paget; Surya D. Pandita; Venkata R. Machavaram; David Collins; Jonathan M. Burns; Liwei Wang; Gerard F. Fernando
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Paper Abstract

Fibre Bragg grating (FBG) sensors continue to be used extensively for monitoring strain and temperature in and on engineering materials and structures. Previous researchers have also developed analytical models to predict the loadtransfer characteristics of FBG sensors as a function of applied strain. The general properties of the coating or adhesive that is used to surface-bond the FBG sensor to the substrate has also been modelled using finite element analysis. In this current paper, a technique was developed to surface-mount FBG sensors with a known volume and thickness of adhesive. The substrates used were aluminium dog-bone tensile test specimens. The FBG sensors were tensile tested in a series of ramp-hold sequences until failure. The reflected FBG spectra were recorded using a commercial instrument. Finite element analysis was performed to model the response of the surface-mounted FBG sensors. In the first instance, the effect of the mechanical properties of the adhesive and substrate were modelled. This was followed by modelling the volume of adhesive used to bond the FBG sensor to the substrate. Finally, the predicted values obtained via finite element modelling were correlated to the experimental results. In addition to the FBG sensors, the tensile test specimens were instrumented with surface-mounted electrical resistance strain gauges.

Paper Details

Date Published: 2 April 2009
PDF: 11 pages
Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72921V (2 April 2009); doi: 10.1117/12.817620
Show Author Affiliations
Shoaib A. Malik, The Univ. of Birmingham (United Kingdom)
Ramani S. Mahendran, The Univ. of Birmingham (United Kingdom)
Dee Harris, The Univ. of Birmingham (United Kingdom)
Mark Paget, The Univ. of Birmingham (United Kingdom)
Surya D. Pandita, The Univ. of Birmingham (United Kingdom)
Venkata R. Machavaram, The Univ. of Birmingham (United Kingdom)
David Collins, The Univ. of Birmingham (United Kingdom)
Jonathan M. Burns, The Univ. of Birmingham (United Kingdom)
Liwei Wang, The Univ. of Birmingham (United Kingdom)
Gerard F. Fernando, The Univ. of Birmingham (United Kingdom)


Published in SPIE Proceedings Vol. 7292:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009
Masayoshi Tomizuka, Editor(s)

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