STP1080: Mechanical Characterization of Unnotched SCS6/Ti-15-3 Metal Matrix Composites at Room Temperature

    Johnson, WS
    Senior research engineer, NASA Langly Research Center, Hampton, VA

    Lubowinski, SJ
    Engineer, BASF Corporation, Charlotte, NC

    Highsmith, AL
    Assistant professor, Texas A&M University, College Station, TX

    Pages: 26    Published: Jan 1990


    Abstract

    The Ti-15-3 metal matrix composites containing silicon carbide (SCS6) fibers, in five different lay-ups, have been tested at room temperature to determine static strengths and mechanical properties. Experimental data and predicted values of the laminate properties and strengths showed good correlation. The off-axis laminate plies (that is 90° and 45°) suffered fiber/matrix interface failures at stress levels as low as 20 ksi, thus significantly affecting the mechanical properties of the laminate. Edge replicas were used to verify the fiber/matrix separations. Microscopic examinations determined that the fiber/matrix failures were occurring in the titanium/silicon reaction layer. Fatigue tests were performed on unnotched specimens to determine the number of cycles to failure versus cyclic stress level. It was found that the stress in the 0° fiber could be used to correlate the fatigue life of different laminates containing 0° phes.

    Keywords:

    titanium, metal matrix composites, silicon-carbide fibers, static strength, interfacial failures, laminate analysis, residual thermal stresses, mechanical properties, composite materials, thermal properties, mechanical properties


    Paper ID: STP25401S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP25401S


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