STP972

    Interlaminar Fracture Analysis of Composite Laminates Under Bending and Combined Bending and Extension

    Published: Jan 1988


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    Abstract

    Interlaminar fracture or delamination is a primary damage mode in laminated composites. It is caused by high interlaminar stresses which are produced by local stress raisers such as holes, free edges, ply drops, and other defects and discontinuities which may be manufacturing related or service induced. Delaminations alter internal load paths and usually contribute to the ultimate failure of the structure.

    The present work is concerned with the development of a simple analytical model which permits the rapidly varying interlaminar stresses and energy release rate to be estimated by elementary means. Extensive numerical computations are avoided, and the results are obtained in closed form. The model is applied to the edge delamination specimen subjected to uniform bending and combined bending and extension loadings. Interlaminar stresses, total energy release rate, and energy release rate components are estimated.

    Keywords:

    composite materials, interlaminar fracture, interlaminar stresses, strain-energy release rate, free-edge delamination, edge delamination test


    Author Information:

    Armanios, EA
    Assistant professor and professor, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA

    Rehfield, LW
    Assistant professor and professor, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA


    Paper ID: STP26129S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP26129S


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