書誌事項
- タイトル別名
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- Estimating Method of Dynamic Fracture Toughness in C/C Composites
- C C フクゴウ ザイリョウ ノ ドウテキ ハカイジンセイ ノ ヒョウカホウ
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Due to low impact strength of C/C composites, it is important to evaluate impact damage properties and impact strength. In this study, the relationship between the impact load and displacement on a drop weight impact test at a low impact speed is used to evaluate the estimating method for dynamic mode II and mixed-mode fracture toughness of C/C composites. 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. As a basis developing experimental identification techniques for boundary conditions, a technique for end notched flexure (ENF) and mixed-mode flexure (MMF) specimen that a beam of C/C composites is proposed. The proposed technique enables one to determine, using data of load variations and displacement variations, the boundary conditions in terms of spring constants of elastic support, damping coefficients, impact velocity and equivalent masses. The results are as follows : (1) The Daubechies' wavelet is useful for smoothing the impact load signals by multiple resolution analysis in wavelet transform. (2) This boundary condition identification method by the numerical analysis of a load variation and a displacement variation is effective, and it can use for calculating the dynamic fracture toughness value of C/C composites.
収録刊行物
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- 日本機械学会論文集Ａ編
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日本機械学会論文集Ａ編 74 (741), 678-685, 2008
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390001204479715584
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- NII論文ID
- 110006685194
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- NII書誌ID
- AN0018742X
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- COI
- 1:CAS:528:DC%2BD1cXpslegsro%3D
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- ISSN
- 18848338
- 03875008
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- NDL書誌ID
- 9526399
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可