Fracture behavior and fracture toughness of pitch-based carbon fiber with an artificial notch introduced by a focused ion beam

Shojiro Ochiai, Shigetaka Kuboshima, Hiroshi Okuda, Kohei Morishita, Eiki Tsushima

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Fracture behavior and fracture toughness of pitch-based carbon fiber were studied using the fiber specimens into which an artificial mode I type straight-fronted edge notch was introduced by a focused-ion (Ga +)-beam. Two fiber samples were used for experiment. One was the as-supplied pitch-based fiber (GRANOC XN-35®, Nippon Graphite Fiber Corporation) and another was the same fiber heat-treated at 3273 K for 3.6 × 103 s in argon atmosphere. The heat-treatment raised the Youngs modulus from 370 to 840 GPa. The fracture toughness value of the as-supplied fiber was ~1.4 MPa m1/2 and the apparent fracture toughness value of the heat-treated fiber was ~4.2 MPa m1/2, which were estimated from the measured values of the strength (σf), notch depth (a), and fiber diameter (D) and correction factor. The increase in the apparent fracture toughness value due to the heat-treatment was attributed to the enhanced c-plane array and its cleavage fracture in longitudinal direction ahead of the notch tip. The analysis of the fracture strength - notch depth relation showed that the fracture of the as-supplied fiber obeys the fracture mechanical criterion and the fracture of the heat-treated fiber obeys the net stress criterion.

本文言語英語
ページ(範囲)265-279
ページ数15
ジャーナルComposite Interfaces
21
4
DOI
出版ステータス出版済み - 5 4 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • セラミックおよび複合材料
  • 物理学および天文学(全般)
  • 表面、皮膜および薄膜

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