Journal of Materials Science

, Volume 29, Issue 18, pp 4750–4756

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

  • Tze-Pin Lin
  • G. A. Cooper
  • M. Hood
Papers

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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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Tze-Pin Lin
    • 1
  • G. A. Cooper
    • 1
  • M. Hood
    • 2
  1. 1.Department of Materials Science and Mineral EngineeringUniversity of California at BerkeleyUSA
  2. 2.Centre for Mining Technology and EquipmentQueensland Centre for Advanced TechnologiesQueenslandAustralia

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