STP1337

    Improved Fatigue Resistance of 7050 Thick Plate Aluminum Through Minimization of Microporosity

    Published: Jan 1998


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    Abstract

    This paper illustrates the substantial fatigue life improvements that have been achieved with 7050 heavy gauge plate over the past two decades. The load control fatigue resistance of 7050-T7451 thick plate is shown to decrease with increasing plate thickness at both the plate quarter-thickness (T/4) and mid-thickness (T/2). These reductions in fatigue resistance are shown to be most substantial at the plate mid-thickness, and they are shown to be directly related to the maximum size of remaining micropores.

    Keywords:

    7050-T7451, aluminum plate, MIL-HDBK-5, load control fatigue properties, microporosity, equivalent stress, thickness effects, process optimization, lognormal distribution


    Author Information:

    Deschapelles, JB
    Rolled Products Technical Manager, Century Aluminum Corporation, Ravenswood, West Virginia

    Rice, RC
    Manager, Structural Integrity Projects Office, Advanced Manufacturing Technology, Battelle, Columbus, Ohio


    Paper ID: STP12342S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP12342S


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