STP1253: Life Prediction of a [0/90] Metal Matrix Composite Under Isothermal and Thermomechanical Fatigue

    Nicholas, T
    Senior scientist and research engineer, Wright Laboratory Materials Directorate, Wright-Patterson AFB, OH

    Russ, SM
    Senior scientist and research engineer, Wright Laboratory Materials Directorate, Wright-Patterson AFB, OH

    Neu, RW
    assistant professor, Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Schehl, N
    Assistant research engineer, University of Dayton Research Institute, Dayton, OH

    Pages: 23    Published: Jan 1996


    Abstract

    Experimental data on cycles to failure are reported for a SCS-6/TIMETAL 21S [0/90]s composite under isothermal fatigue at 650 and 815°C over a range of frequencies from 0.01 to 200 Hz as well as under in-phase and out-of-phase thermomechanical fatigue from 150 to 650°C. Several models are evaluated for correlating fatigue lives based on computed micromechanical stresses using a life fraction concept that considers both cycle-dependent and time-dependent terms. Fractography is used to illustrate the range of failure modes in this material system as well as to both guide and validate the modeling concepts. Over the range of conditions covered in this investigation, purely time-dependent, purely cycle-dependent, fiber-dominated, and matrix-dominated modes of failure, as well as combinations of these, are observed.

    Keywords:

    titanium, metal matrix composites, fatigue (materials), thermomechanical fatigue, life prediction, elevated temperature, titanium matrix composites, titanium alloys, modeling


    Paper ID: STP18243S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP18243S


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