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Frontiers of Optoelectronics

Front. Optoelectron.    2018, Vol. 11 Issue (1) : 60-68     https://doi.org/10.1007/s12200-018-0761-9
RESEARCH ARTICLE |
Use of fiber Bragg grating sensors for monitoring delamination damage propagation in glass-fiber reinforced composite structures
Ayad KAKEI1,2,3, Jayantha A. EPAARACHCHI1,2()
1. School of Mechanical and Electrical Engineering, University of Southern Queensland, Toowoomba QLD 4350, Australia
2. Centre for Future Materials, University of Southern Queensland, Toowoomba QLD 4350, Australia
3. University of Kirkuk, College of Engineering, Kirkuk, Iraq
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Abstract

Embedded fiber Bragg grating (FBG) sensors have been widely used for damage monitoring of fiber composite structures for a few decades. However, many remaining engineering challenges have delayed FBG based in situ structural health monitoring (SHM) systems. One of the major problem associated with FBG based SHM system is the unavailability of reliable data processing algorithms. The present work details a study which has been undertaken for identification of delamination crack propagation in fiber reinforced polymer (FRP) composite plate under uniaxial loading. The strain measured by embedded FBG sensors closer to the crack tip was used to qualitatively and quantitatively analyze delamination damage propagation using recently proposed elasto-plastic model. Strain energy release rate was calculated and compared with the model prediction. The study has concluded that the delamination crack propagation in a FRP composite can be monitored successfully using an integral approach of FBG sensors measurements and the predictions of proposed elasto-plastic model.

Keywords fiber Bragg grating (FBG) sensors      composite      damage modelling      fracture energy     
Corresponding Authors: Jayantha A. EPAARACHCHI   
Online First Date: 28 March 2018    Issue Date: 02 April 2018
 Cite this article:   
Ayad KAKEI,Jayantha A. EPAARACHCHI. Use of fiber Bragg grating sensors for monitoring delamination damage propagation in glass-fiber reinforced composite structures[J]. Front. Optoelectron., 2018, 11(1): 60-68.
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http://journal.hep.com.cn/foe/EN/10.1007/s12200-018-0761-9
http://journal.hep.com.cn/foe/EN/Y2018/V11/I1/60
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Ayad KAKEI
Jayantha A. EPAARACHCHI
Fig.1  Schematic representation of composite beam (section b ´h) as two different materials, elastic orthotropic composite, and the elastic epoxy layer of a negligible thickness. b is width of the specimen; h is thickness of the specimen
Fig.2  Schematic representation of beam, the section near the crack front is in the elastoplastic
Fig.3  Full-width at half-maximum (FWHM)
Fig.4  Strain gauge locations on the sample surface (FBG sensor embedded between two layers and align with strain gauge 2 through the thickness)
Fig.5  Experimental set up
Fig.6  Effect of delamination location on the strain gauges reading
Fig.7  Spectra of embedded FBG in WC/epoxy specimen under tensile loading (delamination test) with increasing applied loadings (experimental result)
Fig.8  Spectra of embedded FBG in WC/epoxy specimen under tensile loading (delamination test) with increasing applied loads, using FBG_SiMul V1.0 software
Fig.9  Examination of delamination stability on the G/GC ratio
Fig.10  Detection of delamination crack onset and propagation for WC/epoxy under tensile loadings using both DI and PWR parameters (experimental results)
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