Volume 6, Issue 4 (December 1984)

    Prediction of Instability Point During Fracture of Composite Materials

    CODEN: CTROAD

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    Abstract

    The crack growth resistance (R curve) approach [1,2] has been widely used to analyze fracture test results on composite materials [3–6]. The method requires measurement of instantaneous crack length with increasing load in a fracture test. In homogeneous materials, the crack is well defined and can be easily measured at any instant. However, fractures in composite materials proceed not by a simple enlargement of the original crack but by formation of a large number of microcracks due to debonding, matrix cracking, and fiber breaks. An instantaneous crack length is difficult to define or measure. Consequently, instantaneous crack length is estimated through a compliance matching procedure [7]. By applying this procedure, point by point, the complete load-crack opening displacement (COD) curve is transformed to an R curve. Fracture toughness of the composite is then obtained by locating the point of instability on the R curve. The process is tedious and time consuming and may reduce accuracy. This technical note mathematically establishes the point of instability on the load-COD curve, which eliminates the necessity of transforming the entire load-COD curve and thus saves time and increases accuracy in obtaining the fracture toughness.


    Author Information:

    Agarwal, BD
    Indian Institute of Technology, Kanpur,

    Patro, BS
    Indian Institute of Technology, Kanpur,

    Kumar, P
    Indian Institute of Technology, Kanpur,


    Stock #: CTR10841J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10841J

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    Author
    Title Prediction of Instability Point During Fracture of Composite Materials
    Symposium , 0000-00-00
    Committee D30