Finite element modelling of fibre Bragg grating strain sensors and experimental validation

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

doi:10.1117/12.817620

2 April 2009 Finite element modelling of fibre Bragg grating strain sensors and experimental validation

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

Author Affiliations +

Proceedings Volume 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009; 72921V (2009) https://doi.org/10.1117/12.817620
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

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.

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Shoaib A. Malik, Ramani S. Mahendran, Dee Harris, Mark Paget, Surya D. Pandita, Venkata R. Machavaram, David Collins, Jonathan M. Burns, Liwei Wang, and Gerard F. Fernando "Finite element modelling of fibre Bragg grating strain sensors and experimental validation", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72921V (2 April 2009); https://doi.org/10.1117/12.817620

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KEYWORDS

Fiber Bragg gratings

Adhesives

Sensors

Finite element methods

Aluminum

Optical fibers

Coating

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