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    STP674

    Fatigue Damage in Boron-Aluminum

    Published: 0


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    Abstract

    The fatigue behavior of three boron fiber reinforced aluminum alloys (1200, 6061.T6M, 2024.T4) has been examined in circular bending and the mechanisms which lead to their progressive deterioration studied. In B-1200, the broken fibers are isolated by crack growth in the matrix parallel to the fibers and originating at the fiber failures. In B-6061.T6M, the broken fibers initiate matrix cracks which are normal to the fibers and which pass around intact fibers without producing their failure. In B-2024.T4, a broken fiber can lead to the failure of the neighboring fibers because of load transfer by the matrix; when this failure is not immediate, it can occur because of matrix cyclic work hardening leading to an increase in transferred load. The matrix bridging two fibers subsequently fails in fatigue after their earlier failure.

    The fatigue behavior and performances of boron-aluminum depends on the intrinsic mechanical properties of the matrix, but is controlled by the effective fibers strength.

    Keywords:

    composite materials, boron-aluminum, fatigue (materials), circular bending, fiber fracture, matrix cracking, work hardening, notch sensitivity, load transfer, load concentrations


    Author Information:

    Leddet, I
    Graduate student and associate professor, Ecole Nationale Superieure des Mines de Paris, Centre des Materiaux,

    Bunsell, AR
    Graduate student and associate professor, Ecole Nationale Superieure des Mines de Paris, Centre des Materiaux,


    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP36931S