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Science and Engineering of Composite Materials

Editor-in-Chief: Hoa, Suong V.

Editorial Board: Hamada, Hiroyuki / Brandt, Andrzej M. / Duc, Nguyen Dinh / Ehrenstein, Gottfried Wilhelm / Hui, David / Lee, L. James / Medraj, Mamoun / Nakai, Asami / Nicolais, Luigi / Seferis, James C. / Tan, Kiang Hwee / Ton-That, Minh Tan / Xiao, Xinran / Zako, Masaru / Zhong, W.H. Katie

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IMPACT FACTOR 2017: 0.619

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2191-0359
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Volume 23, Issue 6

Issues

An experimental study on the effect of length and orientation of embedded FBG sensors on the signal properties under fatigue loading

Esat S. Kocaman
  • Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory (AC2PL), Sabanci University, Istanbul 34956, Turkey
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Casey J. Keulen
  • Materials Engineering, Composites Research Network, University of British Columbia, Vancouver, BC, V6T 1Z4 Canada
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  • De Gruyter OnlineGoogle Scholar
/ Erdem Akay
  • Faculty of Aeronautics and Astronautics, Istanbul Technical University, Istanbul 34469, Turkey
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/ Mehmet Yildiz
  • Corresponding author
  • Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory (AC2PL), Sabanci University, Istanbul 34956, Turkey
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Halit S. Turkmen
  • Faculty of Aeronautics and Astronautics, Istanbul Technical University, Istanbul 34469, Turkey
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Afzal Suleman
Published Online: 2015-05-26 | DOI: https://doi.org/10.1515/secm-2014-0029

Abstract

Fiber Bragg grating (FBG) sensors provide excellent capability for the structural health monitoring (SHM) of load-bearing structures by allowing for local internal strain measurements within structures. However, the integration of these sensors to composite materials is associated with several challenges that have to be addressed to have the correct strain measurement and in turn to perform reliable SHM. One of the most important issues is the presence of uneven strain fields around FBGs, which significantly affect the response of the sensors and hence the reliability of the acquired data. The uniformity of the strain fields around sensors is important for dependable data acquisition; however, to generate such a condition, tow width-to-FBG length relationship, optical fiber configuration with respect to reinforcement fiber orientation, and crack density resulting from fatigue loading are very important factors that have to be considered. In this paper, these issues are addressed by investigating the signal properties of FBG sensors with 1 and 10 mm lengths embedded within the composite specimens during the manufacturing process. After fatigue testing of the specimens, it is shown that 1-mm-long FBGs embedded in-line with adjacent reinforcement fibers with tow widths of ∼2 mm provide much more reliable signals than 10-mm-long FBGs embedded perpendicular to adjacent tows.

Keywords: fatigue monitoring; fiber Bragg gratings; fiber optics; smart structures; structural health monitoring

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About the article

Corresponding author: Mehmet Yildiz, Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory (AC2PL), Sabanci University, Istanbul 34956, Turkey, e-mail:


Received: 2014-01-31

Accepted: 2015-03-04

Published Online: 2015-05-26

Published in Print: 2016-11-01


Citation Information: Science and Engineering of Composite Materials, Volume 23, Issue 6, Pages 711–719, ISSN (Online) 2191-0359, ISSN (Print) 0792-1233, DOI: https://doi.org/10.1515/secm-2014-0029.

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