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The limiting strength of worn metal surfaces

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Abstract

The limiting strength of metal and alloy surfaces strained by wearing with a blunted trepanning tool have been estimated by microhardness measurements. The relationship of the limiting strength to the low strain flow stress of the material depends on metallurgical structure. The stress and strain distribution below the surface have been determined from microhardness measurements as a function of depth and by observing the displacement of foils in a laminated specimen. The recrystallization characteristics of the highly strained surfaces have also been investigated, and it has been found that the strain-aging characteristic in 70/30 brass is removed and that the softening temperature is not decreased by a very high strain. It is suggested that the limiting process is fracture and that the stress system imposed by the wear process inhibits the onset of fracture so that the fracture strain and stress are higher than in conventional deformation processes. The limiting strength results are discussed in terms of the metallurgical structure.

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Authors and Affiliations

  1. Engineering Research Department, National Institute of Agricultural Engineering, Wrest Park, Silsoe, Bedford, Great Britain

    M. A. Moore & D. G. Attwood

  2. Department of Metallurgy, Oxford University, Oxford, Great Britain

    R. C. D. Richardson

Authors
  1. M. A. Moore
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  2. R. C. D. Richardson
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  3. D. G. Attwood
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Additional information

The late R. C. D. RICHARDSON was Head of the Engineering Research Department, National Institute of Agricultural Engineering.

D. G. ATTWOOD, formerly with Engineering Research Department, National Institute of Agricultural Engineering,

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Moore, M.A., Richardson, R.C.D. & Attwood, D.G. The limiting strength of worn metal surfaces. Metall Trans 3, 2485–2491 (1972). https://doi.org/10.1007/BF02647053

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