Chapter 43. Stress-Rupture and Stress-Relaxation Behaviors of PIP-SiC/SiC Composites

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Takashi Nozawa1,
  2. Akira Kohyama1 and
  3. Edgar Lara-Curzio2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch43

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Nozawa, T., Kohyama, A. and Lara-Curzio, E. (2002) Stress-Rupture and Stress-Relaxation Behaviors of PIP-SiC/SiC Composites, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch43

Author Information

  1. 1

    Institute of Advanced Energy, Kyoto University Gokasho, Uji, Kyoto 611–0011, Japan

  2. 2

    Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831–6069

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • SiC/SiC composites;
  • stress-rupture;
  • stress-relaxation;
  • proportional limit;
  • mechanical stabilities

Summary

In order to identify the long-term durability of SiC/SiC composites fabricated by polymer impregnation and pyrolysis process, stress-rupture and stress-relaxation behaviors were investigated in ambient air at 1273 K at the stress level of 25, 35 and 45 MPa. It was found that, in stress-rupture, strain of the material increased rapidly just after holding stress in the case that the applied stress, 45 MPa, was above proportional limit (35 MPa), and, on the while, the others below proportional limit showed continuous increases with time. SiC/SiC composites used in this study showed a remarkable improvement in creep properties in ambient air, compared with C/SiC. SiC/SiC composites had also a good durability in the long-term stress-relaxation test. From this work, it was found that the correlation between stress-relaxation and stress-rupture might be determined by the oxidation effect.