EFFECTS OF THICKNESS AND SPECIMEN SIZE ON FRACTURE TOUGHNESS OF GLASS/EPOXY LAMINATES.

Hiroyuki Kawada, Toshihiro Otsuka, Tadashi Kajitani, Ikuhiko Hayashi

    Research output: Contribution to journalArticle

    Abstract

    Three-point bending tests were conducted on notched specimens of plain woven glass cloth/epoxy laminates, and R curves were obtained. The effects of the thickness and size of the specimens on fracture toughness were investigated. Crack propagation was experimentally observed with the ink method. The electric potential method and the acoustic emission (AE) method were carried out to detect the initiation of the crack. The validity of these nondestructive inspection methods was examined corresponding to the load-displacement curves. It was found that the effect of thickness on fracture toughness was less than that of specimen size; the outputs in the electric potential method could be correlated with the initiation of damage and the propagation of macroscopic cracks, and classified into three distinct patterns; AE counts gave information on fracture behavior such that the initiation of damage and the proportional limit corresponded to the initiation and the rapid increase of the AE event counts, respectively.

    Original languageEnglish
    Pages (from-to)164-170
    Number of pages7
    JournalZairyo/Journal of the Society of Materials Science, Japan
    Volume34
    Issue number377
    Publication statusPublished - 1985 Feb

    Fingerprint

    Acoustic emissions
    fracture strength
    laminates
    Laminates
    Fracture toughness
    acoustic emission
    Glass
    glass
    Cracks
    cracks
    proportional limit
    Bending tests
    Electric potential
    damage
    Ink
    Crack propagation
    inks
    electric potential
    crack propagation
    curves

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Metals and Alloys
    • Polymers and Plastics

    Cite this

    EFFECTS OF THICKNESS AND SPECIMEN SIZE ON FRACTURE TOUGHNESS OF GLASS/EPOXY LAMINATES. / Kawada, Hiroyuki; Otsuka, Toshihiro; Kajitani, Tadashi; Hayashi, Ikuhiko.

    In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 34, No. 377, 02.1985, p. 164-170.

    Research output: Contribution to journalArticle

    Kawada, Hiroyuki ; Otsuka, Toshihiro ; Kajitani, Tadashi ; Hayashi, Ikuhiko. / EFFECTS OF THICKNESS AND SPECIMEN SIZE ON FRACTURE TOUGHNESS OF GLASS/EPOXY LAMINATES. In: Zairyo/Journal of the Society of Materials Science, Japan. 1985 ; Vol. 34, No. 377. pp. 164-170.
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