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    Work of Fracture in Metal Matrix Composites

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    When one talks about “fracture toughness” of composites, one must be careful in distinguishing the energy release rate for the initiation of a crack (γI) and the energy absorbed during the fracture averaged over the whole history of fracture process (γF). Unlike metals, the value of the critical stress intensity factor KIc of composite was found not to reflect any basic material property. Instead, the measurement of γF seems to represent a meaningful toughness property of composite when the composite is a mixture of brittle and ductile phases, such as metal matrix composites (MMCs).

    We have recently conducted experimental and analytical study on the value of γF of unidirectional fiber MMC and obtained a good agreement between the experiment and theory. In this paper, we report the experimental and theoretical results on a particulate MMC. The results of two different types of MMCs have revealed that three-point bending test of the MMC specimen with center notch can be used as a reasonable method to measure γF.


    work of fracture, fracture toughness, metal matrix composites, three-point bending test

    Author Information:

    Daimaru, A
    Research associate, University of Delaware, Newark, Del.

    Hata, T
    Research associate, University of Delaware, Newark, Del.

    Taya, M
    Associate professor, University of Delaware, Newark, DE

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP32810S