Estimation of Impact Damage in C/C Composites by Drop Weight Tests (Estimation of Impact Damage in UD-C/C Composites)

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  • YOSHIOKA Takakazu
    Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology
  • KIKUCHI Hiroaki
    神奈川工科大学大学院工学研究科
  • TAKAHASHI Ichiro
    Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology

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Other Title
  • 落錘試験によるＣ／Ｃ複合材料の衝撃損傷評価（ＵＤ‐Ｃ／Ｃ複合材料の衝撃損傷評価）
  • ラクスイ シケン ニ ヨル C C フクゴウ ザイリョウ ノ ショウゲキ ソンショウ ヒョウカ UD C C フクゴウ ザイリョウ ノ ショウゲキ ソンショウ ヒョウカ
  • Estimation of Impact Damage in UD-C/C Composites
  • UD-C/C複合材料の衝撃損傷評価

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Abstract

Due to low impact strength of C/C composites, it's important to evaluate impact damage properties and impact strength. In this study, the estimating method for impact damage is used to evaluate the relationship between the impact load and displacement, absorbed energy of UD-C/C specimens on a drop weight impact test. The measured impact load is decomposed in approximation components and detail components, and is reduced higher mode of vibration by multiple resolution analysis in wavelet transform. The results are as follows : (1) It is effective for evaluating the damage zone and the initiation by using the impact load-deflection diagram and the absorbed energy. (2) The Daubechies' wavelet is useful for smoothing the impact load signals by multiple resolution analysis in wavelet transform. (3) In the low impact energy that most of the damage does not produce, the approximation component demanded by wavelet analysis accords with the wave pattern of the numerical computation result that is removed free vibration component.

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