STP1059

    A Failure Criterion Evaluation for Composite Materials

    Published: Jan 1990


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    Abstract

    Recently research has been presented on the use of off-axis tensile tests which have nearly uniform stress states along the specimen gage lengths. The uniformity of the stress state is achieved by optimizing the amount of tab clamping and selectively locating the point about which the clamps rotate. The procedure uses the linear finite-element method. However, the off-axis specimens generally exhibit nonlinear response under axial loading. This nonlinear behavior herein is analytically approximated by applying the load incrementally. Predicted and experimentally determined responses of off-axis specimens are compared. To determine the load-carrying capacity of the specimens, a criterion which is a function of both stresses and strains is used.

    Keywords:

    composite materials, finite-element analysis, progressive failure, failure analysis, off-axis specimens


    Author Information:

    Cron, SM
    Captain and professor, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH

    Palazotto, AN
    Captain and professor, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH

    Sandhu, RS
    Aerospace engineer, Air Force Wright Aeronautical Laboratories/FIBCA, Wright-Patterson Air Force Base, OH


    Paper ID: STP24128S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP24128S


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