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

Date

2017-01

Authors

Kocaman, Esat S.
Akay, Erdem
Yilmaz, Cagatay
Turkmen, Halit S.
Misirlioglu, Ibrahim B.
Suleman, Afzal
Yildiz, Mehmet

Journal Title

Journal ISSN

Volume Title

Publisher

Materials

Abstract

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.

Description

Keywords

polymer-matrix composites, fatigue, mechanical testing, damage monitoring, fibre Bragg grating

Citation

Kocaman, E. S.; Akay, E.; Yilmaz, C.; Turkmen, H. S.; Misirlioglu, I. B.; Suleman, A.; & Yildiz, M. (2017). Monitoring the damage state of fiber reinforced composites using an FBG network for failure prediction. Materials, 10(1).