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    STP905

    Resistance Curve Approach to Composite Materials Characterization

    Published: 0


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    Abstract

    The delamination growth resistance of composites under Mode I (opening mode) has been investigated. It is shown that composites exhibit increasing resistance with increasing growth. The double cantilever beam specimen has been used to obtain delamination growth resistance curve over a wide range of delamination extension. The delamination growth resistance curve is shown to be path independent.

    Delamination growth resistance curves have been obtained for current resin materials and high toughness materials. It is shown that the delamination growth resistance depends not only on the resin material but also on the fiber used. AS4/3501-6 material exhibits higher resistance than AS1/3501-6. The influences of temperature and porosity on delamination growth resistance have been investigated. It is found that AS1/3501-6 has lower resistance at -54° C (-65° F) than at room temperature ambient conditions. Porous laminates exhibit slightly lower resistance to delamination growth than nonporous laminates.

    Keywords:

    composites, delamination, fiber, matrix, Mode I, resistance curve, tough resins


    Author Information:

    Ratwani, MM
    ManagerEngineering Specialist, Northrop Corporation, Hawthorne, CA

    Deo, RB
    ManagerEngineering Specialist, Northrop Corporation, Hawthorne, CA


    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP17391S