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    Fatigue Crack Closure: Observations and Technical Significance

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    The meaning of crack closure for fatigue crack growth resistance is discussed under different headings: (1) mechanistic aspects of crack closure—essential differences between microcracks and macrocracks, microstructural influences; (2) direct methods and indirect methods to measure crack closure; (3) numerical aspects of crack closure relations for constant-amplitude loading; and (4) crack closure and variable-amplitude loading. The paper summarizes the present state of the art. Attention is paid to microstructural aspects, changing crack growth mechanisms under threshold conditions and 3-dimensional aspects including plane strain/plane stress problems.


    fatigue, crack growth, fatigue mechanism, crack closure, constant-amplitude loading, variable amplitude loading, microstructure, survey

    Author Information:

    Schijve, J
    Professor of aircraft materials, Faculty of Aerospace Engineering, Delft University of Technology, Delft,

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27198S