STP675

    Statistical Aspects of Fatigue at Microscopic, Specimen, and Component Levels

    Published: Jan 1979


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    Abstract

    The study of fatigue mechanisms at the microscopic level is examined. The complexity of the microstructure and the availability of quantitative microscopy concepts created a need to introduce statistical tools to the fundamental aspects of fatigue research. Examples of the corrosion fatigue of high-strength steel, the bending fatigue of currency paper, and the swelling of nuclear fuel elements are used to illustrate this new viewpoint. The statistical concept of stress in a medium with distributed voids or other geometric imperfections is introduced to permit the use of models different from the conventional continuum viewpoint. The concept of a nested model and the incorporation of a size effect in the study of fatigue at three microscopic levels and three macroscopic (specimen, component, structure) levels are discussed.

    Keywords:

    fatigue, fracture, mathematical modeling, micromechanics, microstructure, nuclear fuel element, paper, quantitative microscopy, size effect, solid mechanics, statistical methods, steel


    Author Information:

    Fong, JT
    Physicist and project leader, Center for Applied Mathematics, National Engineering Laboratory, National Bureau of Standards, Washington, D.C.,


    Paper ID: STP35912S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP35912S


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