Modelling non-uniform strain distributions in aerospace composites using fibre Bragg gratings

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Abstract

In this paper the behaviour of fibre Bragg grating (FBG) sensors under non-uniform strain distributions was analysed. Using the fundamental matrix approach, the length of the FBG sensor was discretised, with each segment undergoing different strain values. FBG sensors that are embedded inside composites, also undergo such non-uniform strain distributions, when located in the vicinity of failures such as matrix cracks or delamination of layers. This non-uniform strain distribution was created in an experimental setup. Finite element analysis was used to analytically model the strain distribution along the FBG length. The measured FBG outputs were then compared to the simulated results. There was a high amplitude correlation between the results of the measured and the simulated reflection spectra with a maximum of 0.97 among all cases.

Original languageEnglish
Title of host publicationProceedings - 25th International Conference on Optical Fiber Sensors
EditorsY. Chung, W. Jin, B. Lee, J. Canning, K. Nakamura, L. Yuan
Place of PublicationBellingham, WA
PublisherSPIE
Pages1-4
Number of pages4
ISBN (Electronic)9781510610927
ISBN (Print)9781510610910
DOIs
Publication statusPublished - 2017
Event25th International Conference on Optical Fiber Sensors - Jeju, Korea, Republic of
Duration: 24 Apr 201728 Apr 2017
Conference number: 25
http://www.ofs-25.org/

Publication series

NameProceedings of SPIE
Volume10323
ISSN (Electronic)0277-786X

Conference

Conference25th International Conference on Optical Fiber Sensors
Abbreviated titleOFS 2017
CountryKorea, Republic of
CityJeju
Period24/04/1728/04/17
Internet address

Keywords

  • FBG simulation
  • Fibre Bragg gratings
  • Fundamental matrix method
  • Non-uniform strain
  • Reflection spectra
  • Structural health monitoring (SHM)

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