A New Approach for Estimation of Damage Patterns in CFRP Composite Laminates Using Embedded FBG Sensors

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  • YASHIRO Shigeki
    Department of Aeronautics and Astronautics, School of Engineering, The University of Tokyo
  • TAKEDA Nobuo
    東京大学大学院新領域創成科学研究科

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Other Title
  • 埋め込みＦＢＧ光ファイバセンサを用いたＣＦＲＰ複合材積層板内の損傷形態推定手法の提案
  • ウメ コミ FBG ヒカリ ファイバ センサ オ モチイタ CFRP フクゴウザイ セキソウバン ナイ ノ ソンショウ ケイタイ スイテイ シュホウ ノ テイアン

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Abstract

This paper proposes a new approach to estimate the damage pattern of a notched cross-ply laminate using an embedded Fiber Bragg Grating (FBG) sensor. The damage pattern near the notch was investigated by finite element analysis with cohesive elements for the onset and the extension of various cracks. Then, the reflection spectrum of the FBG sensor was analyzed from the strain distribution obtained in the damage analysis. Based on the above analysis, the damage pattern is optimized as an inverse problem in the damage analysis, while the spectrum shape is adopted as the objective function. In the estimation scheme, the strain distribution of the FBG sensor is calculated by the damage analysis using the damage pattern expressed by the residual strength distribution of the cohesive elements. We estimated the damage patterns of the notched cross-ply laminate from the reflection spectra obtained in the analysis and those measured in the experiment. The estimated damage patterns agreed well with those corresponding to the input spectra.

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