STP519

    Periodic Overloads and Random Fatigue Behavior

    Published: Jan 1971


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    Abstract

    The occurrence of occasional high amplitude strain cycles in an otherwise stationary random strain time history considerably reduces the fatigue life of mild steel specimens. The acceleration of damage is shown to occur throughout the cyclic damage process. The significance of this effect in terms of fatigue in railway vehicles is emphasized. The results of overload studies are often confusing because of the influence of induced residual stresses. In this work, care was given to ensure that no such effects occurred.

    Keywords:

    fatigue (materials), railroad cars, loads (forces), strains, cycles, cyclic loads, damage, crack initiation, crack propagation, scanning electron microscopy


    Author Information:

    Watson, P
    Scientific officer, scientific officer, and project engineer, Fatigue Research Group, Derby

    Hoddinott, DS
    Scientific officer, scientific officer, and project engineer, Fatigue Research Group, Derby

    Norman, JP
    Scientific officer, scientific officer, and project engineer, Fatigue Research Group, Derby


    Paper ID: STP38035S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38035S


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