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Plastic work of fatigue crack propagation in steels and aluminum alloys

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Abstract

The plastic work per unit area of fatigue crack propagation,U, is one of the parameters controlling the rate of fatigue crack propagation,dc/dN. The equation,dc/dN = A ΔK 4/(σfy 2μ U), was previously shown to fit the data for 7 iron and aluminum base alloys for the range of thedc/dN vs ΔK curve where the Paris relation is valid. Values ofU are now available for 6 additional alloys covering a much wider range of σy 42 to 868 MN/m2. For the total populationA = (2.8 ± 0.9) X 10-3 where 2.8 is the mean and 0.9 is the standard deviation. In this equation, σy is the 0.2 pct offset cyclic yield stress and μ is the shear modulus. The parameterU is related to microstructure and should be of interest to the metallurgist. Generally,U varies oppositely to σy due to decrease in the plastic zone size; however, the plastic strain amplitude and degree of localization of the plastic strain in the plastic zone are also important.

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Authors and Affiliations

  1. Structural Behavior of Materials Department, Westinghouse Electric Corp. Research and Development Center, 15235, Pittsburgh, PA

    P. K. Liaw

  2. Department of Metallurgical Engineering, Korea University, Seoul, Korea

    S. I. Kwun (Assistant Professor)

  3. Northwestern University, 60201, Evanston, IL

    M. E. Fine (Professor of Materials Science and Engineering)

Authors
  1. P. K. Liaw
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  2. S. I. Kwun
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  3. M. E. Fine
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Liaw, P.K., Kwun, S.I. & Fine, M.E. Plastic work of fatigue crack propagation in steels and aluminum alloys. Metall Trans A 12, 49–55 (1981). https://doi.org/10.1007/BF02648507

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