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    The Use of Interfacial Test Methods in Composite Materials Development

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    Interfacial testing generates physical information about the fiber matrix interface in a variety of forms. In recent years, there has been considerable discussion about the reliability of the tests and the compatibility of the data generated. One question that has only marginally been addressed is what is required from interfacial test methods to support the rest of the composites community in the understanding and development of fiber-reinforced composite materials. In this paper, the requirements of composite developers and designers are evaluated and related to the information generated by existing test methods. Data are presented demonstrating the significant influence that interface has on macroscopic properties. The relationship of this type of data to interfacial test techniques currently used is also addressed. Those interfacial test methods in use fall into three basic types and each generates information under different loading conditions. An attempt has been made to correlate these conditions to failure processes that occur in full-scale composites. This has clarified where there are deficiencies in both the test methods used and the type of data required. If interfacial property evaluation in composite materials is to become an integral part of composite design, then there needs to be an improved correlation between data generated and end-user requirements


    composites, interfaces, surface treatments, failure, design, micro-mechanics, test methods

    Author Information:

    Pitkethly, MJ
    Technology leader, Structural Materials Centre, Defense Research Agency, Farnborough Hants,

    Committee/Subcommittee: D30.06

    DOI: 10.1520/STP38224S