Chapter 9. Influence of Fiber Lay-Up Sequence on Mechanical Properties of SiC(f)/SiC Composites

  1. John B. Wachtman Jr.
  1. Dileep Singh,
  2. Jitendra P. Singh and
  3. Manish Sutaria

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314876.ch9

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4

How to Cite

Singh, D., Singh, J. P. and Sutaria, M. (1996) Influence of Fiber Lay-Up Sequence on Mechanical Properties of SiC(f)/SiC Composites, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314876.ch9

Author Information

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

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375433

Online ISBN: 9780470314876

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Keywords:

  • continuous fiber-reinforced ceramic matrix composites;
  • internal residual stresses;
  • multiaxial stress;
  • hot-gas filters;
  • four-point-bend mode

Summary

Mechanical properties of Nicalon-fiber-reinforced silicon carbide matrix composites with two different fiber lay-up sequences (0°/40°/60° and 0°/45°) were evaluated at various temperatures ranging from ambient to 1300°C. Composites with 0°/40°/60° fiber lay-up sequence showed a higher average first matrix cracking stress than that of 0°/45° composites. The measured room-temperature ultimate strength of the 0°/40°/60° composites was 300 MPa, compared to 180 MPa for the 0°/45° composites. These measured ultimate strengths 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 two sets of composites is attributed to the relative contributions of the off-axis fibers to the load-bearing capacity of each composite. Up to 1200°C, ultimate strength and work-of-fracture in each set of composites increased, but then declined above 1300°C. The decreases were correlated to in-situ Nicalon fiber strength and fiber/matrix interface degradation.