Evaluation of fracture toughness in C/C composite under four-point bending (Difference in fabrication method and fracture mechanism)

Hiroyuki Kawada, Makoto Matsumori, Hideo Omata, Tomoyuki Uruno, Jiro Hiramoto, Ikuhiko Hayashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

To evaluate 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.

Original languageEnglish
Pages (from-to)978-983
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume60
Issue number572
Publication statusPublished - 1994 Apr
Externally publishedYes

Fingerprint

Fracture toughness
Fabrication
Bending strength
Composite materials
Vacuum
Fibers
Carbon fiber reinforced plastics
Bending tests
Shielding
Crack propagation
Cracks
Compliance
carbon fiber reinforced plastic

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Evaluation of fracture toughness in C/C composite under four-point bending (Difference in fabrication method and fracture mechanism). / Kawada, Hiroyuki; Matsumori, Makoto; Omata, Hideo; Uruno, Tomoyuki; Hiramoto, Jiro; Hayashi, Ikuhiko.

In: Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 60, No. 572, 04.1994, p. 978-983.

Research output: Contribution to journalArticle

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