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Open AccessArticle

Monitoring the Damage State of Fiber Reinforced Composites Using an FBG Network for Failure Prediction

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Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, 34956 Istanbul, Turkey
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Faculty of Aeronautics and Astronautics, Ayazaga Campus, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
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Integrated Manufacturing Technologies Research and Application Center, Sabanci University, Tuzla, 34956 Istanbul, Turkey
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Sabanci University-Kordsa Global, Composite Technologies Center of Excellence, Istanbul Technology Development Zone, Sanayi Mah. Teknopark Blvd. No: 1/1B, Pendik, 34906 Istanbul, Turkey
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Mechanical Engineering Department, University of Victoria, Victoria, BC V8W 2Y2, Canada
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Author to whom correspondence should be addressed.
Academic Editors: M.H. Ferri Aliabadi and Zahra Sharif Khodaei
Materials 2017, 10(1), 32; https://doi.org/10.3390/ma10010032
Received: 15 September 2016 / Revised: 16 December 2016 / Accepted: 20 December 2016 / Published: 3 January 2017
(This article belongs to the Special Issue Advances in Structural Health Monitoring for Aerospace Structures)
A structural health monitoring (SHM) study of biaxial glass fibre-reinforced epoxy matrix composites under a constant, high strain uniaxial fatigue loading is performed using fibre Bragg grating (FBG) optical sensors embedded in composites at various locations to monitor the evolution of local strains, thereby understanding the damage mechanisms. Concurrently, the temperature changes of the samples during the fatigue test have also been monitored at the same locations. Close to fracture, significant variations in local temperatures and strains are observed, and it is shown that the variations in temperature and strain can be used to predict imminent fracture. It is noted that the latter information cannot be obtained using external strain gages, which underlines the importance of the tracking of local strains internally. View Full-Text
Keywords: polymer-matrix composites; fatigue; mechanical testing; damage monitoring; fibre Bragg grating polymer-matrix composites; fatigue; mechanical testing; damage monitoring; fibre Bragg grating
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MDPI and ACS Style

Kocaman, E.S.; Akay, E.; Yilmaz, C.; Turkmen, H.S.; Misirlioglu, I.B.; Suleman, A.; Yildiz, M. Monitoring the Damage State of Fiber Reinforced Composites Using an FBG Network for Failure Prediction. Materials 2017, 10, 32.

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