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A dislocation barrier model for fatigue crack growth threshold

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Recent Advances in Fracture Mechanics

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Abstract

The primary mechanism of fatigue crack growth is crack-tip dislocation emission followed by the glide of the emitted dislocations. Both of these two processes are controlled by the crack-tip resolved shear stress field, which is characterized by the resolved shear stress intensity factor, K Rτ

A dislocation barrier model for fatigue crack growth threshold is constructed. The model assumes that a fatigue crack stops growing when crack-tip slip bands are incapable of penetrating the primary dislocation barrier. The derived and deduced threshold behaviors agree with the observed constant threshold K max,th in the low R region and constant threshold △K th in the high R region. K max,th is the K max at the threshold. The constant K max,th is related to the resistance of the primary dislocation barrier, which in most of cases is grain boundary; and the constant △K th is related to the resistance of secondary barriers. Furthermore, the analysis shows that K max,th is proportional to √d, where d is the grain size. The relation has been observed in steels. The model also helps to explain the characteristics of, and the transition from, microstructure-sensitive to microstructure-insensitive growth.

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Authors and Affiliations

  1. Syracuse University, 1040 Continentals Way, Belmont, CA, 94002, USA

    H. W. Liu (Emeritus Professor)

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  1. H. W. Liu
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Editors and Affiliations

  1. Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, USA

    W. G. Knauss

  2. Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, USA

    R. A. Schapery

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© 1998 Springer Science+Business Media Dordrecht

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Liu, H.W. (1998). A dislocation barrier model for fatigue crack growth threshold. In: Knauss, W.G., Schapery, R.A. (eds) Recent Advances in Fracture Mechanics. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2854-6_14

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  • DOI: https://doi.org/10.1007/978-94-017-2854-6_14

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-5266-7

  • Online ISBN: 978-94-017-2854-6

  • eBook Packages: Springer Book Archive

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