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    STP1360

    A Plate Element-Based Model for Mixed-Mode Debonding of Composite Stitched Stiffened Panels

    Published: 01 January 2000


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    Abstract

    An analysis based on plate finite elements and the virtual crack closure technique is used to study the effect of stitching on Mode I and Mode II strain energy release rates for a stitched warpknit composite debond configuration. The stitches were modeled as discrete nonlinear fastener elements with a compliance determined by experiment. The axial and shear behavior of the stitches was considered with both the compliances and failure loads assumed to be independent. The effect of model slenderness ratio on the accuracy of the strain energy release rates determined with the plate element models for configurations without stitching was determined by comparison with similar plane strain models. The analysis showed that stitches are very effective in reducing Mode I strain energy release rate, GI by closing the debond faces near the debond front; however, they are less effective in reducing the Mode II strain energy release rate, GII.

    Keywords:

    woven composites, stitching, stiffener debonding, plate finite elements, VCCT


    Author Information:

    Glaessgen, EH
    National Research Council resident associate, NASA Langley Research Center, Hampton, VA

    Raju, IS
    Head and senior scientist, NASA Langley Research Center, Hampton, VA

    Poe, CC
    Head and senior scientist, NASA Langley Research Center, Hampton, VA


    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP13420S