STP1110

    The Upper Bounds of Reduced Axial and Shear Moduli in Cross-Ply Laminates with Matrix Cracks

    Published: Jan 1991


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    Abstract

    The present study proposes a mathematical model utilizing the Internal State Variable (ISV) concept for predicting the upper bounds of the reduced axial and shear stiffnesses in cross-ply laminates with matrix cracks. The displacement components at the matrix crack surfaces are explicitly expressed in terms of the observable axial and shear strains and the undamaged material properties. The reduced axial and shear stiffnesses are predicted for glass/epoxy and graphite/epoxy laminates. Comparison of the model with other theoretical and experimental studies is also presented to confirm direct applicability of the model to angle-ply laminates with matrix cracks subjected to general in-plane loading.

    Keywords:

    composite materials, fracture, fatigue (materials), matrix crack, cross-ply laminate, shear, tension, upper bound, stiffness reduction, internal state variable


    Author Information:

    Lee, J-W
    Research assistant and professor, Texas A&M University, College Station, TX

    Allen, DH
    Research assistant and professor, Texas A&M University, College Station, TX

    Harris, CE
    Head, NASA Langley Research Center, Hampton, VA


    Paper ID: STP17712S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP17712S


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