Internal Notched Flexure (INF) Test for Measurement of Mode II Interlaminar Fracture Toughness of Fiber Composites

    (Received 24 August 2013; accepted 25 November 2013)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    A revised analysis to derive the expression for the mode II interlaminar fracture toughness of fiber-reinforced polymers from internal notched flexure (INF) testing in small deformation is presented here. The approach adopted for the derivation takes into account the interlaminar shear load in the overhanging section outside the span. This improves the prediction accuracy for the initial specimen compliance, as evident from a finite element (FE) model of the INF specimen. The FE model also suggests that extensive damage develops at the crack tip before the delamination growth. Therefore, rather than using the physical crack length to calculate the interlaminar fracture toughness, one should use the effective crack length, which can be determined based on the measured specimen stiffness from experimental testing. With that, the analytical expression yields an inerlaminar fracture toughness that is consistent with the input value for the cohesive elements of the FE model.


    Author Information:

    Belay, Tsegay
    Dept. of Mechanical Engineering, Univ. of Alberta, Edmonton,

    Jar, P.-Y. Ben
    Dept. of Mechanical Engineering, Univ. of Alberta, Edmonton,

    Cheng, J.-J. Roger
    Dept. of Civil & Environmental Engineering, Univ. of Alberta, Edmonton,


    Stock #: MPC20130034

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130034

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    Author
    Title Internal Notched Flexure (INF) Test for Measurement of Mode II Interlaminar Fracture Toughness of Fiber Composites
    Symposium , 0000-00-00
    Committee E08