Chapter 76. Effect of Fiber Architecture on Mechanical Behavior of SiC(f)/SiC Composites

  1. J. P. Singh
  1. Dileep Singh,
  2. Jitendra P. Singh and
  3. Manish Sutaria

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch76

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Singh, D., Singh, J. P. and Sutaria, M. (1997) Effect of Fiber Architecture on Mechanical Behavior of SiC(f)/SiC Composites, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch76

Author Information

  1. Energy Technology Division, Argonne National Laboratory Argonne, Illinois 60439

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

SEARCH

Keywords:

  • matrix composites;
  • mechanical properties;
  • silicon carbide;
  • interface degradation;
  • strength characteristics

Summary

We evaluated mechanical properties (first matrix cracking stress, strength, and work-of-fracture) of Nicalon-fiber-reinforced silicon carbide matrix composites with three different fiber lay-up sequences (0°/20°/60°, 0°/40°/60°, and 0°/45°) at various temperatures from room to 1300°C. Up to 1200°C, ultimate strength and work-of-fracture for the 0°40°/60° and 0°/45° composites increased, but then declined at 1300°C. The decreases were correlated to in-situ Nicalon fiber strength and fiber/matrix interface degradation. However, for the 0°/20°/60° composites, ultimate strength and work-of-fracture reached their a minima at 1200°C. These measured ultimate strengths at room and 1300°C were correlated to the predictions made with an analytical model and to in-situ fiber strength characteristics. The large difference in room-temperature ultimate strengths between the three sets of composites is attributed to the relative contributions of the off-axis fibers to the load-bearing capacity of each composite.