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Measurement of the fracture toughness of polycrystalline diamond using the double-torsion test

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Abstract

The double-torsion test was employed to study the processes of crack propagation and to measure the fracture toughness of polycrystalline diamond. The value of fracture toughness of about 13 MPa m1/2 is surprisingly high. Inhomogeneity in microstructure may cause discontinuous crack propagation which makes it difficult to study the subcritical crack growth behaviour of this polycrystalline material. Subcritical crack growth is shown to be negligible and crack deflection is shown to be an important toughening mechanism in polycrystalline diamond.

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Authors and Affiliations

  1. Department of Materials Science and Mineral Engineering, University of California at Berkeley, 94720, CA, USA

    Tze-Pin Lin & G. A. Cooper

  2. Centre for Mining Technology and Equipment, Queensland Centre for Advanced Technologies, 4069, Queensland, QLD, Australia

    M. Hood

Authors
  1. Tze-Pin Lin
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  2. G. A. Cooper
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  3. M. Hood
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Lin, TP., Cooper, G.A. & Hood, M. Measurement of the fracture toughness of polycrystalline diamond using the double-torsion test. Journal of Materials Science 29, 4750–4756 (1994). https://doi.org/10.1007/BF00356519

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  • DOI: https://doi.org/10.1007/BF00356519

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