Chapter 62. Stress-Rupture and Stress-Relaxation of Sic\Sic Composites at Intermediate Temperature

  1. Mrityunjay Singh and
  2. Todd Jessen
  1. Gregory N. Morscher1 and
  2. Janet Hurst2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294680.ch62

25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3

25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3

How to Cite

Morscher, G. N. and Hurst, J. (2008) Stress-Rupture and Stress-Relaxation of Sic\Sic Composites at Intermediate Temperature, in 25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3 (eds M. Singh and T. Jessen), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294680.ch62

Author Information

  1. 1

    Ohio Aerospace Institute NASA Glenn Research Center, MS 106-5 Cleveland, OH 44135

  2. 2

    NASA Glenn Research Center, MS 106-5 Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2001

ISBN Information

Print ISBN: 9780470375730

Online ISBN: 9780470294680

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Keywords:

  • composites;
  • stress-rupture;
  • temperatures;
  • carbon;
  • materials

Summary

Tensile static stress and static strain experiments were performed on woven Sylramic (Dow Coming, Midland, MI) and Hi-NicalonTM (Nippon Carbon, Japan) fiber reinforced, BN interphase, melt-infiltrated SiC matrix composites at 815°C. Acoustic emission was used to monitor the damage accumulation during the test. The stress-rupture properties of Sylramic composites were superior to that of Hi-NicalonTM composites. Conversely, the applied strain levels that Hi-NicaloTM composites can withstand for stress-relaxation experiments were superior to Sylramic composites; however, at a cost of poor retained strength properties for Hi-NicalonTM composites. Sylramic composites exhibited much less stress-oxidation induced matrix cracking compared to Hi-NicalonTM composites. This was attributed to the greater stiffness and roughness of Sylramic fibers themselves and the lack of a carbon layer between the fiber and the BN interphase for Sylramic composites, which existed in Hi-NicalonTM composites. Due to the lack of stress-relief for Sylramic composites, time to failure for Sylramic composite stress-relaxation experiments was not much longer than for stress-rupture experiments when comparing the peak stress condition for stress-relaxation with the applied stress of stress-rupture.