Applicability of fracture toughness concept to fracture behavior of carbon/carbon composites

Hiroshi Hatta, Yasuo Kogo, Hideyuki Asano, Hiroyuki Kawada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Carbon/Carbon (C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2 000°C in an inert atmosphere. However, mainly due to lack of knowledge of design criteria, C/C composites have not been used in primary heat resistant structures. For example, almost no unified explanation has been given about fracture behavior of C/C composites. The objective of this paper is to examine whether the linear elastic fracture mechanics (LEFM) is able to be applied to a C/C composite. The LEFM is tried to apply to fracture behavior in tensile tests of the double-edge-notched and compact tension specimens and in the four-point bending test of the single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained by the LEFM concept with the aid of tf-curve behavior if the pre-crack length is long enough to be able to neglect the notch tip radius. From fractographic observation it was found that R-curve behavior of the C/ C composite was mainly attributed to the fiber-bridging effect near the notch tip.

Original languageEnglish
Pages (from-to)897-903
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Issue number620
Publication statusPublished - 1998
Externally publishedYes


  • Composite material
  • Fracture criterion
  • Fracture toughness
  • Net section stress
  • Point-stress criterion
  • R-Curve behavior
  • Stress intensity factor

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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