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    Corrosion Fatigue Testing of Steels as Applicable to Offshore Structures

    Published: 01 January 1990

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    Fatigue is a potentially important failure mode for offshore structures. Development of realistic data (high-cycle regime of the S-N curve or near-threshold region of the crack growth rate-stress intensity range curve) is made difficult by the fact that load excursions are mostly of low amplitude (high-cycle fatigue) with frequency in the range of 0.05 to 0.5 Hz; and so one or more years of testing may be required to establish a single data point (S-N approach) or da/dN-ΔK curve. In the present paper experimental alternatives for developing both fatigue life and crack growth rate data for offshore applications are presented, with particular emphasis upon test parameters and variables of importance. Special emphasis is placed upon techniques for multiple specimen testing. In addition, a novel approach for characterizing near-threshold fatigue crack growth rates within realistic test periods is proposed and discussed.


    corrosion fatigue, fatigue testing, crack initiation, crack propagation, steel, welded steel, variable amplitude, polarization

    Author Information:

    Hartt, WH
    Professor and director, Center for Marine Materials, Boca Raton, FL

    Committee/Subcommittee: G01.09

    DOI: 10.1520/STP26101S