STP907

    Fatigue Damage in Notched Pultruded Composite Rods

    Published: Jan 1986


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    Abstract

    The primary damage mode in a notched pultruded composite rod in rotating bending fatigue was found to be fiber-matrix debonding which originated at the notch root and extended along the length of the specimen. At stress amplitudes equal to or greater than 35% of the tensile strength of the material, debonding was followed by tensile rupture of the fibers at or near the notch, resulting in catastrophic failures of the specimens. At lower stress amplitudes, the slow growth in debonding resulted in a gradual increase in the dynamic deflection of the specimen. The static flexural stiffness ratio of a fatigue-damaged specimen to that of an undamaged specimen was found to be a reasonable measure of damage due to fiber-matrix debonding.

    Keywords:

    pultruded rod, unidirectional composite, rotating bending fatigue, damage mechanism, debonding, catastrophic failure, dynamic deflection, static stiffness ratio


    Author Information:

    Mallick, PK
    Associate professor, professor, and student, University of Michigan-Dearborn, Dearborn, MI

    Little, RE
    Associate professor, professor, and student, University of Michigan-Dearborn, Dearborn, MI

    Thomas, J
    Associate professor, professor, and student, University of Michigan-Dearborn, Dearborn, MI


    Paper ID: STP19987S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP19987S


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