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    STP905

    A Compact Mode II Fracture Specimen

    Published: 0


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    Abstract

    A compact Mode II fracture specimen together with its loading frame is analyzed and tested. This system is a further development of an earlier circular Mode II fracture specimen presented by the authors. For fatigue precracking in two different loading configurations, formulas relating the Mode I stress intensity factor, applied load, and specimen geometry are developed. In order to determine KIIc from the fracture load, a relationship between KII, the applied load, and specimen/loading frame geometry is obtained. All of these relations are calculated by means of the finite element method.

    These formulas are then employed to perform a series of Mode II fracture toughness tests with Perspex (also called Plexiglas or polymethyl methacrylate [PMMA]). The average measured KIIc value was 0.94 MPa√m. The KIc tests were performed with the compact tension specimen, yielding KIc = 1.06 MPa√m; thus KIc/KIIc was found to be 1.127. In addition, crack propagation angles were found to be between 63 and 70°. These results are compared with the maximum tangential stress and maximum tangential principal stress criteria.

    Keywords:

    fracture, Mode II, fracture toughness, Perspex, polymethyl methacrylate (PMMA), fracture criteria, Mode II specimen


    Author Information:

    Banks-Sills, L
    Senior Lecturer And Professor, Tel-Aviv University, Ramat-Aviv, Tel-Aviv,

    Arcan, M
    Senior Lecturer And Professor, Tel-Aviv University, Ramat-Aviv, Tel-Aviv,


    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP17406S