STP1321

    Fatigue Analysis of a Vessel Experiencing Pressure Oscillations

    Published: Jan 1997


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    Abstract

    A pressure vessel, designed and tested under laboratory conditions for tens of thousands of cycles, failed in service after only a few cycles. Thousands of oscillatory pressure reversals have been measured at each loading. However, the predominance of the stress amplitudes were well below the critical threshold values necessary to initiate fatigue cracking.

    Analysis has demonstrated that the disparity between lab cycling and field loading conditions cannot be explained simply by mechanical loading alone. Further investigation into the problem revealed that an extremely aggressive environment, the by-products of the internal combustion from within the pressure vessel, along with high temperatures, pressures, and other sources of high tensile loading all contribute to the short fatigue life of the vessel.

    Keywords:

    low cycle fatigue, pressure oscillation, pressure vessel, cumulative damage model, residual stresses, hoop stress, radial stress, fatigue cracks, Palmgren-Miner rule, environmentally assisted cracking


    Author Information:

    Troiano, E
    Research Engineer, US Army Research Development and Engineering Center, Benet Laboratories, Watervliet, New York

    Underwood, JH
    Research Engineer, US Army Research Development and Engineering Center, Benet Laboratories, Watervliet, New York

    Scalise, A
    Research Engineer, US Army Research Development and Engineering Center, Benet Laboratories, Watervliet, New York

    O'Hara, GP
    Research Engineer, US Army Research Development and Engineering Center, Benet Laboratories, Watervliet, New York

    Crayon, D
    Mechanical Engineering Technician, US Army Research Development and Engineering Center, Benet Laboratories, Watervliet, New York


    Paper ID: STP12321S

    Committee/Subcommittee: E08.93

    DOI: 10.1520/STP12321S


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