Evaluation of Fracture Toughness in C/C Composite under Four-Point Bending. (Difference in Fabrication Method and Fracture Mechanism).

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  • 四点曲げ試験における炭素／炭素複合材の破壊靭性評価　（成形法の差異と破壊機構）
  • 4テン マゲ シケン ニ オケル タンソ タンソ フクゴウザイ ノ ハカイ ジ

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To evalute fracture toughness of C/C composites, four-point bending tests (SEN) are performed. The C/C composites are carbonized from the CFRPs, which are fabricated by means of two different methods (a hot-press method and a vacuum-bagging one). It is found that each fabrication method leads to a different distribution of bending strength. The vacuum-bagging method is preferable to obtain uniform bending strength properties. Crack growth resistance curves are obtained based on the compliance matching method. These curves have an inclination of convergence at a nearly equal constant value regardless of fabrication method. Existence of the stress shielding mechanism in the C/C composites is suggested by the R curves. From a fractographic observation, crack propagates three-dimensionally, and then pullouts of the fiber bundle occur at a large scale in the fiber-bridging mechanism.

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