Chapter 69. Effect of Environment on Fatigue Behavior of a NicalonTM/SI-N-C Ceramic Matrix Composite

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Sreeramesh Kalluri1,
  2. Greg C. Ojard2 and
  3. Michael J. Verrilli3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch69

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

Kalluri, S., Ojard, G. C. and Verrilli, M. J. (2008) Effect of Environment on Fatigue Behavior of a NicalonTM/SI-N-C Ceramic Matrix Composite, 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.ch69

Author Information

  1. 1

    Ohio Aerospace Institute NASA Glenn Research Center 21000 Brookpark Road M/S 49–7 Brook Park, Ohio 44135

  2. 2

    United Technologies Research Center 411 Silver Lane M/S 129–24 East Hartford, Connecticut 06108

  3. 3

    NASA Glenn Research Center 21000 Brookpark Road M/S 106–5 Brook Park, Ohio 44135

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:

  • diameter;
  • humidity;
  • Si-N-C matrix;
  • polymer;
  • characterization

Summary

The effect of environmental exposure on the fatigue life of NicalonTM /Si-N-C composite was investigated in this study. Test specimens with arrays of 1.8 mm diameter holes and two different open areas, 25 and 35%, were machined. Three environmental conditions were studied: 1) continuous fatigue cycling in air, 2) fatigue cycling in air alternating with humidity exposure, and 3) fatigue cycling in air alternating with exposure to a salt-fog environment. All fatigue testing on specimens with holes was performed with a load ratio, R = 0.05, and at a temperature of 910 °C. In general, fatigue lives were shortest for specimens subjected to salt-fog exposure and longest for specimens subjected to continuous fatigue cycling in air. The fatigue data generated on the specimens with holes were compared with fatigue data generated in air on specimens with no holes. Fatigue strength reduction factors for different environmental conditions and open areas investigated in the study were calculated for the NicalonTM /Si-N-C composite.