Evaluation of In-Plane Mode II Fracture Toughness in Unidirectional GFRP Using Four-Point Shear Loading Test (Revised Method and Dependence of the Pre-Crack Length)

Hiroyuki Kawada, Hiroshi Shimanuki, Hideo Omata, Ikuhiko Hayashi

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    In-plane Mode II fracture toughness tests on unidirectional GFRP are conducted using a four-point shear loading test method. In the previous paper, the four-point shear loading test method was examined as a simple Model II fracture toughness test. Then the effect of pre-crack length on fracture toughness was investigated. In this study, the same test method is applied to evaluate the Mode II fracture toughness. The dependence of the pre-crack length and the initial failure process are clarified. The results obtained are summarized as follows; (1) It is revealed that the crack opening displacement is much less than the crack relative sliding displacement in the four-point shear loading test. (2) From an analysis of the damage propagation length, it is found that the initiation of the main crack is close to the maximum load point. The initial failure behavior of the unidirectional GFRF subjected to shear loading is clarified. (3) The normalized stress intensity factor concerning an orthotropic body of the unidirectional GFRF is calculated by a finite element method. The mode II fracture toughness is constant irrespective of the pre-crack length.

    Original languageEnglish
    Pages (from-to)817-822
    Number of pages6
    JournalZairyo/Journal of the Society of Materials Science, Japan
    Issue number478
    Publication statusPublished - 1993



    • :GFRF
    • Four-point shear loading test
    • Initial failure process
    • Mode II fracture toughness and FEM

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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