Advanced Composite Materials

The Korean Society for Composite Materials (한국복합재료학회)
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Smart Honeycomb Sandwich Panels With Damage Detection and Shape Recovery Functions

  • Okabe, Yoji (Department of Mechanical and Biofunctional Systems, Institute of Industrial Science, The University of Tokyo) ;
  • Minakuchi, Shu (Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo) ;
  • Shiraishi, Nobuo (Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo) ;
  • Murakami, Ken (Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo) ;
  • Takeda, Nobuo (Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo)
  • Published : 2008.03.01
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Abstract

In this research, optical fiber sensors and shape memory alloys (SMA) were incorporated into sandwich panels for development of a smart honeycomb sandwich structure with damage detection and shape recovery functions. First, small-diameter fiber Bragg grating (FBG) sensors were embedded in the adhesive layer between a CFRP face-sheet and an aluminum honeycomb core. From the change in the reflection spectrum of the FBG sensors, the debonding between the face-sheet and the core and the deformation of the face-sheet due to impact loading could be well detected. Then, the authors developed the SMA honeycomb core and bonded CFRP face-sheets to the core. When an impact load was applied to the panel, the cell walls of the core were buckled and the face-sheet was bent. However, after the panel was heated over the reverse transformation finish temperature of the SMA, the core buckling disappeared and the deflection of the face-sheet was relieved. Hence the bending stiffness of the panel could be recovered.

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References

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