Volume 19, Issue 2 (April 1997)

    Fatigue Behavior of a Cross-Ply Titanium Matrix Composite with Tensile and Zero Mean Load at Elevated Temperature

    CODEN: CTROAD

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    Abstract

    The fatigue response of a cross-ply [0/90]2S titanium (Ti-15-3) matrix composite reinforced with silicon carbide fibers (SCS-6) was investigated at 427°C. Tension-tension (tensile mean stress) and tension-compression (zero mean stress) loadings were applied. For the same stress range, tension-tension loading caused much lower fatigue lives and greater strain ratchetting than those under tension-compression loading. Despite the longer fatigue lives under tension-compression loading, additional plasticity sites and fatigue damage mechanisms were observed. Fatigue damage mechanisms could be classified into two distinct regimes, independent of mean load, fiber-dominated (fibers fracture prior to matrix cracking) at high-stresses and low-cyclic lives, and matrix dominated (matrix fatigue cracks prior to fiber fracture) at longer lives. Comparisons of the 427°C results are made with previously reported results at room temperature. Deformation mechanisms and fatigue lives were influenced by the testing temperature.


    Author Information:

    Boyum, EA
    Professor and head, Department of Aeronautics and Astronautics and former graduate student, Air Force Institute of Technology, OH

    Mall, S
    Professor and head, Department of Aeronautics and Astronautics and former graduate student, Air Force Institute of Technology, OH


    Stock #: CTR10015J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10015J

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    Author
    Title Fatigue Behavior of a Cross-Ply Titanium Matrix Composite with Tensile and Zero Mean Load at Elevated Temperature
    Symposium , 0000-00-00
    Committee D30