Chapter 10. Creep and Subcritical Crack Growth of Nextel 720 Alumino Silicate Fibers as Received and After Heat Treatment at 1300°C

  1. J. P. Singh
  1. J. Göring and
  2. H. Schneider

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch10

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Göring, J. and Schneider, H. (1997) Creep and Subcritical Crack Growth of Nextel 720 Alumino Silicate Fibers as Received and After Heat Treatment at 1300°C, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch10

Author Information

  1. German Aerospace Research Establishment (DLR), Institute of Materials Research, D-51157 Köln, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • alumino silicate fibers;
  • mechanical behavior;
  • crack growth;
  • ceramic composites;
  • microstructure

Summary

The high temperature and long term mechanical behavior of Nextel 720 alumino silicate fibers was investigated at 1000°C. In the as received condition creep tests yielded a creep stress of 300 MPa for 1% strain limit after 10.000 h. Furthermore, intensive subcritical crack growth was determined (crack extension exponent N?17) at 1000°C by dynamic fatigue tests. After pre-annealing the fibers at 1300°C for 2 hours, a 60% increase in the creep rate was determined, but no significant change in subcritical crack growth could be observed.