STP610: An Automated Method for Evaluating Resistance to Stress-Corrosion Cracking with Ring-Loaded Precracked Specimens

    Kaufman, JG
    Senior engineering associate, research engineer, and section head, Alcoa Laboratories, Aluminum Company of America, Alcoa Center, Pa.

    Coursen, JW
    Senior engineering associate, research engineer, and section head, Alcoa Laboratories, Aluminum Company of America, Alcoa Center, Pa.

    Sprowls, DO
    Senior engineering associate, research engineer, and section head, Alcoa Laboratories, Aluminum Company of America, Alcoa Center, Pa.

    Pages: 14    Published: Jan 1976


    Abstract

    This paper describes a ring-loading method for evaluating stress-corrosion resistance with precracked specimens and presents representative data for compact specimens of some high-strength aluminum alloys. The deflection of the ring was large relative to that of the specimen, simulating deadweight loading. This method provides several advantages over techniques previously used. Unlike most constant-displacement loading systems, the load and crack length and thus the stress intensity are known accurately throughout the life of each test, and the initiation and growth of stress-corrosion cracking (SCC) lead to a definitive end point (failure). Also, the effects of corrosion product wedging are minimal. The ring loading system is more compact than most deadweight systems, and because it is readily automated, data can be collected with the expenditure of few manhours.

    Keywords:

    stress corrosion, crack propagation, automated test methods, ring loading, threshold, stress intensity, aluminum alloys


    Paper ID: STP28673S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP28673S


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