Smart Honeycomb Sandwich Panels with Damage Detection and Shape Recovery Functions

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  • OKABE Yoji
    Department of Aeronautics and Astronautics, School of Engineering, 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

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Other Title
  • 損傷検知・形状回復能力を有する知的ハニカムサンドイッチパネルの構築
  • ソンショウ ケンチ ケイジョウ カイフク ノウリョク オ ユウスル チテキ ハニカムサンドイッチパネル ノ コウチク

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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 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 facesheet and an aluminum honeycomb core. From the change in the reflection spectrum of the FBG sensors, the debonding between the facesheet and the core and the deformation of the facesheet due to impact loading could be well detected. Then, the authors developed the SMA honeycomb core and bonded the CFRP facesheets to the core. When an impact load was applied to the panel, the cell walls of the core were buckled and the facesheet was bent. However, after the panel was heated over the reverse transformation temperature of the SMA, the core buckling disappeared and the deflection of the facesheet was relieved. Hence the bending stiffness of the panel could be recovered.

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