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Effect of dislocation substructures on fatigue fracture

  • Symposium on Mechanical-Thermal Processing and Dislocation Substructure Strengthening
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Abstract

The effect of dislocation substructures on fatigue is explored within the following categories: a) the dislocation substructures produced by cycling in annealed material and the effect of cycling on substructures introduced extraneously before cycling; b) hight and low strain fatigue fracture, expressed in terms of Coffin-manson or stress-life plots; and c) the effect of substructure on the mechanisms of crack nucleation and propagation. Usually, cycling is very effective in rearranging substructures introduced extraneously, especially at high strains. Consequently, there is little effect of the substructures on fatigue fracture except under some circumstances at low strains, and also if the agent of introducing the initial substructures has had an effect on the fracture process, for example, by opening cracks at inclusions. Dislocation substructure, however formed, is not significant,per se, to fatigue fracture except in acting as a source of plastic deformation.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Pennsylvania, 19174, Philadelphia, PA

    Campbell Laird (Member AIME/ASM, Chairman)

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  1. Campbell Laird
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Additional information

This paper is based on a presentation made at a symposium on “Mechanical-Thermal Processing and Dislocation Substructure Strengthening,” held at the Annual Meeting in Las Vegas, Nevada, on February 23, 1976, under the sponsorship of the TMS/IMD Heat Treating Committee.

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Laird, C. Effect of dislocation substructures on fatigue fracture. Metall Trans A 8, 851–860 (1977). https://doi.org/10.1007/BF02661566

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