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Fatigue crack growth in plate specimens under Mode III loading

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Abstract

Fatigue crack growth in plate specimens of aluminium and an aluminium alloy has been investigated under Mode III loading conditions. It has been found that only when a fully plastic situation exists, does crack extension proceed by a valid Mode III mechanism. When plasticity is restricted to planes of maximum shear there is a strong component of Mode I cracking which results in delamination in the direction of macroscopic growth. Under constant load amplitude cycling the crack growth curve exhibits three stages: a reduction in rate is followed by a period of steady growth prior to acceleration in the final stages. Such a profile is independent of material condition or failure mechanism. Cycling between fixed displacement limits leads to a reducing growth and crack arrest which occurs at a length proportional to the square of the displacement.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Bristol, University Walk, Bristol, UK

    W. J. Plumbridge

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  1. W. J. Plumbridge
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Plumbridge, W.J. Fatigue crack growth in plate specimens under Mode III loading. J Mater Sci 20, 1015–1026 (1985). https://doi.org/10.1007/BF00585746

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  • DOI: https://doi.org/10.1007/BF00585746

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