Chapter 52. Stress/Life Behavior of C/SiC Composites in a Low Partial Pressure of Oxygen Environment Part II: Stress Rupture Life and Residual Strength Relationship

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Anthony Calomino1,
  2. Michael J. Verrilli1 and
  3. David J. Thomas2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch52

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

Calomino, A., Verrilli, M. J. and Thomas, D. J. (2002) Stress/Life Behavior of C/SiC Composites in a Low Partial Pressure of Oxygen Environment Part II: Stress Rupture Life and Residual Strength Relationship, 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.ch52

Author Information

  1. 1

    NASA Glenn Research Center 21000 Brookpark Road Cleveland, Ohio 44135

  2. 2

    Ohio Aerospace Institute 22800 Cedar Point Road Cleveland, Ohio 44142

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:

  • silicon carbide;
  • fraction;
  • ceramic matrix composites;
  • oxidative environments;
  • oxidation

Summary

Stress-rupture lives and residual strength measurements were obtained for carbon fiber-reinforced silicon carbide (C/SiC) composite specimens. Two types of tests were performed for this study. The first set consisting of several creep-rupture tests all performed under a constant stress of 207 MPa was used to determine the mean rupture life of the C/SiC composite. A second set of creep-rupture tests performed under the same constant stress of 207 MPa were interrupted at a fixed fraction of the mean rupture life and residual strength measurements were taken. All testing was performed at 1200°C in an environment of 1000 ppm O2/Ar. The low oxygen partial pressure environment was used to retard carbon fiber oxidation and thereby extend rupture life and improve the data spread over a high range of stress. All specimens were machined from a single processing lot of material. A statistical comparison of the test results reveals a relationship between residual strength and creep-life for the C/SiC material. The results also support the development of a Probabilistic Residual Strength (PRS) life model.