Strain monitoring of braided composites by using embedded fiber-optic strain sensors

Tatsuro Kosaka, Hideaki Kurimoto, Katsuhiko Osaka, Asami Nakai, Toshiko Osada, Hiroyuki Hamada, Takehito Fukuda

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Recently, fiber optic strain sensors have been applied to internal strain and damage monitoring of composites because of their small size, light weight and flexibility. Braided fiber reinforced plastics (FRP) are compatible with fiber optic sensors because optical fibers can be integrated directly and easily into fabrics. In the present paper, the strain monitoring of braided glass fiber reinforced plastics (GFRP) was conducted by using embedded fiber Bragg grating (FBG) and extrinsic Fabry-Perot interferometric (EFPI) sensors during the cure process, tensile tests and fatigue tests. From the experimental results of cure monitoring, it was found that both sensors can be used only for monitoring of thermal residual strain during cooling process. From the results of tensile tests, it was found that both sensors could measure strain correctly until damage initiation of braided GFRP. It also appeared that FBG sensors could monitor damage to FRP by observing the reflected spectral shape. From the fatigue tests, it appeared that the strain measured by embedded FBG sensors was affected by fatigue damage. Therefore, it is concluded that internal strain monitoring of braided FRP using fiber optic strain sensors is very useful for cure and health monitoring.

Original languageEnglish
Pages (from-to)157-170
Number of pages14
JournalAdvanced Composite Materials: The Official Journal of the Japan Society of Composite Materials
Issue number3-4
Publication statusPublished - Dec 1 2004

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering


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