STP1156

    High-Temperature Tension-Compression Fatigue Behavior of a Unidirectional Tungsten Copper Composite

    Published: Jan 1993


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    Abstract

    The high-temperature fatigue behavior of a [0]12 tungsten fiber-reinforced copper matrix composite was investigated. Specimens having fiber volume percentages of 10 and 36 were fatigued under fully reversed, strain-controlled conditions at both 260 and 560°C. The fatigue life was found to be independent of fiber volume fraction because fatigue damage preferentially occurred in the matrix. Also, the composite fatigue lives were shorter at 560°C as compared to 260°C, due to changes in mode of matrix failure. On a total strain basis, the fatigue life of the composite at 560°C was the same as the life of unreinforced copper, indicating that the presence of the fibers did not degrade the fatigue resistance of the copper matrix in this composite system. Comparison of strain-controlled fatigue data to previously generated load-controlled data revealed that the strain-controlled fatigue lives were longer because of mean strain and mean stress effects.

    Keywords:

    metal matrix composites, fatigue, high temperature, tungsten fibers, copper matrix, strain control


    Author Information:

    Verrilli, MJ
    Research engineer and research metallurgist, NASA Lewis Research Center, Cleveland, OH

    Gabb, TP
    Research engineer and research metallurgist, NASA Lewis Research Center, Cleveland, OH


    Paper ID: STP24753S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP24753S


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