STP1049

    Environmentally Induced Fatigue Crack Propagation Under Variations in the Loading Conditions

    Published: Jan 1990


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    Abstract

    In order to evaluate the influence of the environment on the crack retardation behavior under variable loading conditions, high-low block loading tests were performed in vacuum, air, and a 3.5% NaCl (sodium chloride) solution. In an additional test series, variations of the environment from vacuum in the high loading period to air or to 3.5% NaCl solution in the low loading period were performed, and vice versa. These tests, together with an extensive study of the crack surface morphology gave insight into the different fatigue mechanisms induced by the various environments at the crack tip.

    A further test series was performed, where the load level was kept constant (constant-amplitude loading) and only the test environment was changed. The results show a variation of the environment from the 3.5% NaCl solution to vacuum causes a retardation in fatigue crack propagation.

    Keywords:

    fatigue crack propagation, variable amplitude loading, environmental influence, aluminium alloys, fatigue delay, fatigue (materials), cracking, environmental effects


    Author Information:

    Schulte, K
    Senior scientist and department head, DFVLR, Institute für Werkstoff-Forschung, Köln,

    Nowack, H
    Senior scientist and department head, DFVLR, Institute für Werkstoff-Forschung, Köln,

    Lütjering, G
    Professor, Technische Hochschule Hamburg-Harburg, Hamburg-Harburg,


    Paper ID: STP24075S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP24075S


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