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

Hiroshi Hatta, Yasuo Kogo, Hideyuki Asano, Hiroyuki Kawada

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Carbon/Carbon(C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2000°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 the fracture behavior of C/C composites. The objective of this paper is to examine the adequacy of the linear elastic fracture mechanics (LEFM) as the fracture criterion of notched C/C composites. Thus the LEFM was tried to be applied to fracture behavior in tensile tests of double-edge-notched and compact tension specimens and in four-point bending tests of single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained in terms of the LEFM concept with the aid of R-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 C/C composites was mainly attributed to the fiber-bridging effect near the notch tip.

    Original languageEnglish
    Pages (from-to)265-271
    Number of pages7
    JournalJSME International Journal, Series A: Mechanics and Material Engineering
    Volume42
    Issue number2
    Publication statusPublished - 1999

    Fingerprint

    Carbon carbon composites
    Fracture toughness
    Fracture mechanics
    Bending tests
    Elastic moduli
    Cracks
    Mechanical properties
    Fibers

    Keywords

    • Carbon/Carbon Composites
    • Fracture Criterion
    • Fracture Toughness
    • Net Section Stress
    • Point-Stress Criterion
    • R Curve Behavior
    • Stress Intensity Factor

    ASJC Scopus subject areas

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

    Cite this

    Applicability of fracture toughness concept to fracture behavior of carbon/carbon composites. / Hatta, Hiroshi; Kogo, Yasuo; Asano, Hideyuki; Kawada, Hiroyuki.

    In: JSME International Journal, Series A: Mechanics and Material Engineering, Vol. 42, No. 2, 1999, p. 265-271.

    Research output: Contribution to journalArticle

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