Journal of Materials Science

, Volume 19, Issue 9, pp 3028–3042 | Cite as

The deformation stress of highly brittle explosive crystals from real contact area measurements

  • M. Munawar Chaudhri


An experimental study is described in which the deformation stress of millimetre-size highly brittle as-grown single crystals of explosive materials has been determined using a novel experimental technique. The technique involves the loading of the test crystal against a transparent glass plate with in situ measurements of the real area of contact under load using an optical microscope. For all explosive crystals the deformation stress was found to increase with load reaching a plateau at higher loads. The maximum deformation stress of a crystal was found to be considerably lower than its Vickers diamond hardness value. A discussion on the determination of the uniaxial yield stress of small particles is also given.


Brittle Explosive Contact Area Glass Plate Area Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M. M. Chaudhri,Nature 263 (1976) 121.Google Scholar
  2. 2.
    D. Tabor,J. Lub. Technol. 103 (1981) 169.Google Scholar
  3. 3.
    J. T. Hagan andM. M. Chaudhri,J. Mater. Sci. 12 (1977) 1055.Google Scholar
  4. 4.
    S. J. P. Palmer andJ. E. Field,Proc. Roy. Soc. A383 (1982) 399.Google Scholar
  5. 5.
    M. M. Chaudhri, PhD Thesis, University of Cambridge (1969).Google Scholar
  6. 6.
    C. S. Choi andH. P. Boutin,Acta Crystallogr. B25 (1969) 982.Google Scholar
  7. 7.
    Melanie A. Pierce-Butler,ibid. B38 (1982) 2681.Google Scholar
  8. 8.
    H. H. Cady, A. C. Larson andD. T. Cromer,ibid. 16 (1963) 617.Google Scholar
  9. 9.
    C. S. Choi andE. Prince,ibid. B28 (1972) 2857.Google Scholar
  10. 10.
    P. J. Halfpenny, K. J. Roberts andJ. N. Sherwood,J. Mater. Sci. 19 (1984) 1629.Google Scholar
  11. 11.
    H. D. Megaw, “Crystal structures: A Working Approach” (Saunders Company, London, 1973) p. 82.Google Scholar
  12. 12.
    M. T. Sprackling, “The Plastic Deformation of Simple Ionic Crystals” (Academic Press, London, 1976) p. 23.Google Scholar
  13. 13.
    F. P. Bowden andD. Tabor, “The Friction and Lubrication of Solids” (Clarendon Press, Oxford, 1950) p. 5.Google Scholar
  14. 14.
    M. M. Chaudhri,Phil. Mag. A48 (1983) L15.Google Scholar
  15. 15.
    M. M. Chaudhri, I. M. Hutchings andP. L. Makin,ibid. A49 (1984) 493.Google Scholar
  16. 16.
    J. T. Hagan,J. Mater. Sci. Lett. 16 (1981) 2909.Google Scholar

Copyright information

© Chapman and Hall Ltd 1984

Authors and Affiliations

  • M. Munawar Chaudhri
    • 1
  1. 1.Cavendish LaboratoryCambridgeUK

Personalised recommendations