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.
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Authors like to acknowledge the technical support provided by Mr. Mohan Trada, School of Mechanical and Electrical Engineering and Mr. Wayne Crowell, Centre for Future Materials of USQ.
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Dr. Jayantha A. Epaarachchi is a senior academic attached to School of Mechanical and Electrical Engineering, University of Southern Queensland (USQ), Australia. His major research interests are smart composite structures, structural health monitoring (SHM), fatigue, fracture, and damage mechanics of fibre reinforced composite materials. He is an active member of Centre for Future Materials (CFM), USQ. He has published over 80 scientific papers, three book chapters and edited a book & special issues of journals. Dr. Epaarachchi owns an US patient on SHM with Boeing Aircraft Company and completed a few large scale SHM and smart composite structures projects. He was a visiting scientist at University of Bristol, UK and Harbin Institute of Technology, China.
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Kakei, A., Epaarachchi, J.A. Use of fiber Bragg grating sensors for monitoring delamination damage propagation in glass-fiber reinforced composite structures. Front. Optoelectron. 11, 60–68 (2018). https://doi.org/10.1007/s12200-018-0761-9
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DOI: https://doi.org/10.1007/s12200-018-0761-9