Chapter 65. Stress Rupture of Nextel 610/Alumina-Yttria Composites

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Howard G. Halverson1 and
  2. William A. Curtin2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch65

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Halverson, H. G. and Curtin, W. A. (2000) Stress Rupture of Nextel 610/Alumina-Yttria Composites, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch65

Author Information

  1. 1

    Department of Engineering Science and Mechanics Virginia Tech, Blacksburg, VA 24061

  2. 2

    Division of Engineering Brown University, Providence, RI 02912

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

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Keywords:

  • oxideloxide ceramic matrix composites;
  • creep deformation;
  • rupture behavior;
  • nexte1720 fibers;
  • notch-sensitivity

Summary

The tensile and stress-rupture properties of a Nextel 610 reinforced alumina-yttria material are examined at temperatures up to 1093°C (2000°F). Microscopy on virgin and tested specimens indicate that initial matrix damage in the form of matrix microcracks exists in as-received materials and does not increase during testing. Pushout testing indicates no significant change in interface frictional stress during testing. Therefore, the mechanical damage driving stress-rupture is deduced to be concentrated in the fibers. A model has been developed which relates the composite stress-rupture lifetime to single fiber rupture data and which includes the effect of preexisting matrix cracking. This model contains no adjustable parameters. While the creep deformation and trends in lifetime are accurately captured by this technique, the composite lifetimes predicted using single fiber rupture data are smaller than observed.