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Sensors 2014, 14(3), 4144-4153; doi:10.3390/s140304144

Post-Impact Fatigue Damage Monitoring Using Fiber Bragg Grating Sensors

Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan
Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
Author to whom correspondence should be addressed.
Received: 16 December 2013 / Revised: 17 February 2014 / Accepted: 18 February 2014 / Published: 3 March 2014
(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)
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It has been shown that impact damage to composite materials can be revealed by embedded Fiber Bragg Gratings (FBG) as a broadening and splitting of the latter’s characteristic narrow peak reflected spectrum. The current work further subjected the impact damaged composite to cyclic loading and found that the FBG spectrum gradually submerged into a rise of background intensity as internal damages progressed. By skipping the impact, directing the impact to positions away from the FBG and examining the extracted fibers, we concluded that the above change is not a result of deterioration/damage of the sensor. It is caused solely by the damages initiated in the composite by the impact and aggravated by fatigue loading. Evolution of the grating spectrum may therefore be used to monitor qualitatively the development of the incurred damages.
Keywords: fatigue; impact damage; polymer-matrix composites; health monitoring; fiber Bragg grating fatigue; impact damage; polymer-matrix composites; health monitoring; fiber Bragg grating
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Shin, C.-S.; Liaw, S.-K.; Yang, S.-W. Post-Impact Fatigue Damage Monitoring Using Fiber Bragg Grating Sensors. Sensors 2014, 14, 4144-4153.

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