STP568

    Residual Strength Characterization of Laminated Composites Subjected to Impact Loading

    Published: Jan 1975


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    Abstract

    An analogy between damage inflicted by a single-point hard-particle impact and damage inflicted by inserting a flaw of known dimensions in a static tensile coupon is discussed. The results suggest that residual strength can be predicted as a function of kinetic energy of impact by executing two experiments, a static tension test on an unflawed specimen and a static tension test on a coupon previously subjected to a single-point impact. The model appears to be accurate for impact velocities which are less than the penetration velocity. For velocities above complete penetration, the residual strength is identical to the static strength of a coupon with a hole having the same diameter as the impacting particle. Comparison of various materials indicates that the impact strength of composite materials is strongly influenced by the strain energy to failure of the reinforcement.

    Keywords:

    composite materials, damage, laminates, impact strength, kinetic energy, fractures (materials), residual strength


    Author Information:

    Husman, GE
    Materials engineer, materials research engineer, and senior research scientist, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Ohio

    Whitney, JM
    Materials engineer, materials research engineer, and senior research scientist, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Ohio

    Halpin, JC
    Materials engineer, materials research engineer, and senior research scientist, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Ohio


    Paper ID: STP33152S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP33152S


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