Chapter 80. Fatigue Behavior of a Nextel Tm 720\Alumina (N720\A) Composite at Room and Elevated Temperature

  1. Mrityunjay Singh and
  2. Todd Jessen
  1. Steven G. Steel,
  2. Larry P. Zawada and
  3. Shankar Mall

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294680.ch80

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

Steel, S. G., Zawada, L. P. and Mall, S. (2001) Fatigue Behavior of a Nextel Tm 720\Alumina (N720\A) Composite at Room and Elevated 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.ch80

Author Information

  1. Air Force Research Laboratory Materials and Manufacturing Directorate Metals, Ceramics and NDE Division 2230 Tenth Street, Suite 1 Wright-Patterson AFB, OH 45433–7817

Publication History

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

ISBN Information

Print ISBN: 9780470375730

Online ISBN: 9780470294680

SEARCH

Keywords:

  • ceramic;
  • alumina;
  • fatigue;
  • infiltration;
  • pyrolysis

Summary

An oxide\oxide ceramic matrix composite (CMC) with no interphase at the fiber-matrix interface was characterized under monotonic tensile testing and cyclic tensile loading at 23°C and 1200°C. The effect of room temperature moisture exposure on fatigue behavior was also examined at 1200°C. The composite consisted of 10 plies of 8HSW NextelTM 720 fabric in a porous all alumina matrix. At 23°C the average ultimate tensile strength was 144 MPa and the maximum fatigue stress to achieve run out (105 cycles and I Hz) was 102 MPa. At 1200°C average ultimate strength was 140 MPa and the maximum fatigue stress to achieve run out was 122 MPa. Periodic exposure to moisture did not degrade fatigue strength at 1200°C. Test specimens that achieved run out were tension tested at 23°C and exhibited retained tensile strength equal to or greater than the as-received test specimens.