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Fracture Mechanics and Fatigue Crack Propagation

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Fatigue as a Design Criterion

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Abstract

The methods of analysis proposed for assessing the integrity of components in the HCF region (discussed in Chapters 2 and 3) are concerned with total life considerations where the cyclic life spent in fatigue crack propagation may be considered small. This supposes that the life to crack formation and that to fracture are more or less coincident. In Chapter 5, the cyclic life involved in crack formation in the intermediate and LCF regions, where macroplasticity may accumulate cyclically, was discussed in some detail, but life predictions were limited to that of producing an engineering crack. Pre-existing flaws or defects have not so far been specifically considered, although the statistical nature of fatigue is, to some extent, due to inhomogeneities and structural and microstructural defects of one kind or another. The scatter in fatigue life is more prevalent in the HCF region where nucleation and crack formation takes longer, and since nucleation commences at local weaknesses or defects, this observation is not surprising.

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Authors and Affiliations

  1. Department of Mechanical Engineering and Naval Architecture, Portsmouth Polytechnic, UK

    Terance V. Duggan & James Byrne

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  1. Terance V. Duggan
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  2. James Byrne
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© 1977 Terance V. Duggan and James Byrne

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Duggan, T.V., Byrne, J. (1977). Fracture Mechanics and Fatigue Crack Propagation. In: Fatigue as a Design Criterion. Palgrave, London. https://doi.org/10.1007/978-1-349-03222-8_6

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  • DOI: https://doi.org/10.1007/978-1-349-03222-8_6

  • Publisher Name: Palgrave, London

  • Print ISBN: 978-1-349-03224-2

  • Online ISBN: 978-1-349-03222-8

  • eBook Packages: EngineeringEngineering (R0)

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