Influence of Environment and Specimen Thickness on Fatigue Crack Growth Data Correlation by Means of Elber-Type Equations

    Published: Jan 1983

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    The effects of environment and specimen thickness on crack closure in 2024 aluminum alloy were investigated by using constant-amplitude fatigue tests. Crack growth rates for all test conditions were correlated with ΔKeff values derived from equations based on the crack closure theory of Elber. Crack closure behavior was confirmed to be independent of environment, except for a small deviation ascribed to corrosion product wedging. Surprisingly, the Elber-type equations worked equally well for all specimen thicknesses; a possible explanation is offered. These results have important implications with respect to fatigue crack growth prediction models based on crack closure effects.


    aluminum alloys, fatigue crack growth, crack closure, environmental effects, load ratio

    Author Information:

    Ewalds, HL
    Delft University of Technology, Delft,

    van Doorn, FC
    Delft University of Technology, Delft,

    Sloof, WG
    Delft University of Technology, Delft,

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP44809S

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