Advertisement

Journal of Materials Science

, Volume 31, Issue 16, pp 4213–4219 | Cite as

Damage propagation in carbon/silicon carbide composites during tensile tests under the SEM

  • A. Dalmaz
  • P. Reynaud
  • D. Rouby
  • G. Fantozzi
Papers

Abstract

A study has been made of the evolution of damage during monotonic and cyclic tensile tests conducted in situ in a scanning electron microscope on a 2.5D carbon fibre/silicon carbide matrix composite. Tests were carried out on composite specimens and the damage evolution was observed in the lateral section, using a gold square mesh deposited on the surface. Owing to the mismatch of the thermal expansion coefficients of the constituents, the initial composite already contains matrix microcracks. Cracking was observed in the transverse and longitudinal directions according to the load. This cracking consists of the growth of the pre-existing cracks, due to the thermal misfit, and the initiation of cracks in previously undamaged zones. The complex architecture, and specifically the yarn weave, induce rotation of individual fibres or bundles, which leads also to a large opening of the longitudinal cracks. Moreover, sliding at the fibre/matrix interface or at the interfaces with adjacent fibres has been pointed out, from the opening of the transverse cracks and with the help of the mesh. These mechanisms, as in other composites, could be the main origin of tensile cyclic behaviour due to a wear phenomenon in the interfacial regions.

Keywords

Carbide Tensile Test Damage Evolution Composite Specimen Transverse Crack 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    F. J. Arendts, A. Theuer, K. Mail and J. Kuhnle, Mechanical behavior different sized C/C-SiC tubes under multi-uaxial load and temperature up to 1600 °C (1994).Google Scholar
  2. 2.
    J. W. Holmes, “Ceramics and ceramic matrix composites”, edited by S. R. Levine (ASME, New York, 1992).Google Scholar
  3. 3.
    W. L. Morris, B. N. Cox, D. B. Marshall, R. V. Inman and M. R. James, J. Am. Ceram. Soc. 77 (1994) 792.CrossRefGoogle Scholar
  4. 4.
    S. F. Shuler, J. W. Holmes and X. Wu, ibid. 76 (1994) 2327.CrossRefGoogle Scholar
  5. 5.
    A. G. Evans and F. W. Zok, J. Mater. Sci. 29 (1994) 3857.CrossRefGoogle Scholar
  6. 6.
    D. Rouby and P. Reynaud, Compos. Sci. Technol. 48 (1993) 109.CrossRefGoogle Scholar
  7. 7.
    P. Reynaud, Thèse Institut National des Sciences Appliquées (1992) ISAL 920043.Google Scholar
  8. 8.
    P. Reynaud, D. Rouby and G. Fantozzi, Scripta Metall. Mater. 31 (1994) 1061.CrossRefGoogle Scholar
  9. 9.
    P. B. Pollock, Carbon 28 (1990) 717.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • A. Dalmaz
    • 1
  • P. Reynaud
    • 1
  • D. Rouby
    • 1
  • G. Fantozzi
    • 1
  1. 1.Institut National des Sciences Appliquées, Groupe d'Etudes de Metallurgie Physique et de Physique des MatériauxUMR CNRS 5510Villeurbanne cedexFrance

Personalised recommendations