Monitoring of internal residual strain changes in CFRP using FBG sensors

Shin-ichi Takeda; Jun Koyanagi; Shin Utsunomiya; Yuto Kinoshita; Yoshihiko Arao; Hiroyuki Kawada

doi:10.1117/12.851692

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14 April 2010 Monitoring of internal residual strain changes in CFRP using FBG sensors

Shin-ichi Takeda, Jun Koyanagi, Shin Utsunomiya, Yuto Kinoshita, Yoshihiko Arao, Hiroyuki Kawada

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Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75223N (2010) https://doi.org/10.1117/12.851692
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

FBG (Fiber Bragg Grating) sensors were embedded into CFRP unidirectional composite laminates in a direction perpendicular to the carbon fiber. Residual strains after curing were evaluated by the reflection spectrum from the FBGs. The CFRP laminates were kept at 100°C for monitoring of the residual strain change measured by the FBGs. Without mechanical loading, occurrence of physical aging was confirmed by the residual strain changes. The relationship between the influence of physical aging on residual strain and the thickness of the CFRP was almost linear.

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Shin-ichi Takeda, Jun Koyanagi, Shin Utsunomiya, Yuto Kinoshita, Yoshihiko Arao, and Hiroyuki Kawada "Monitoring of internal residual strain changes in CFRP using FBG sensors", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75223N (14 April 2010); https://doi.org/10.1117/12.851692

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