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    Effect of Post Buckling on the Fatigue of Composite Structures

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    This paper discusses the physics involved in shear and compression post buckling and compares their forced displacement forms. First level, simplified mathematical treatise are presented. The more complex rigorous mathematics are avoided, with emphasis being placed on the qualitative aspects. The objective is to contribute to a fundamental understanding of post-buckling behavior that will help establish practical design limits.

    It is shown that the surface strains and substructure separation forces can be assessed, with reasonable accuracy, once the displacement shapes are established. Test panel deflections and strain measurements are compared with predicted values. Static and fatigue test results on panels subject to loadings in the post-buckled range are presented.


    fibrous composites, shell structures, post buckling, compression, shear, forced displacement, fatigue test panels, moiré patterns, displacement strain, fatigue (materials), composite materials

    Author Information:

    Rhodes, JE
    Senior research and development engineer, Lockheed-California Company, Burbank, Calif.

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP27610S