STP452: Role of the Interface in the Fracture of Fiber-Composite Materials

    Cooper, G A
    Senior research fellow (Composite Materials Section), and superintendent of the Division of Inorganic and Metallic Structure, National Physical Laboratory, Teddington, Middlesex,

    Kelly, A
    Senior research fellow (Composite Materials Section), and superintendent of the Division of Inorganic and Metallic Structure, National Physical Laboratory, Teddington, Middlesex,

    Pages: 17    Published: Jan 1969


    Abstract

    The mechanical properties of a fiber-reinforced material are governed in part by the transfer of stress between fiber and matrix. This transfer occurs across the interface between the components, and the properties of this interface, therefore, will affect the properties of the composite. In this paper we consider some of the composite properties which are affected by the mechanical strength of the interface, both in tension and in shear.

    The strength of the interface in tension governs the transverse strength of the composite. Properties dependent on this include the longitudinal compressive strength and the resistance of the material to the presence of notches. Theories of the transverse strength of a composite are examined and compared.

    The shear strength of the interface affects primarily the load transfer length of the fiber-matrix system. It thus affects the strength of composites reinforced by discontinuous fibers, and the work of fracture under conditions of fiber pullout. It is also an important parameter in determining creep and fatigue properties and in determining notch resistance.

    Keywords:

    fiber-reinforcement, composites, fracturing, fracture properties, toughness, interfaces, evaluation, tests


    Paper ID: STP44701S

    Committee/Subcommittee: D30.03

    DOI: 10.1520/STP44701S


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