Chapter 65. Effects of Varying PO2 on Subcritical Crack Growth in Continuous-Fiber Reinforced Ceramic Composites
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8
How to Cite
Henager, C. H. and Jones, R. H. (1993) Effects of Varying PO2 on Subcritical Crack Growth in Continuous-Fiber Reinforced Ceramic Composites, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314180.ch65
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375266
Online ISBN: 9780470314180
- ceramic matrix;
- ceramic composite materials;
Time-dependent crack growth measurements of ceramic composites in varying PO2 environments were conducted on materials consisting of chemical vapor infiltration (CVI) SiC reinforced with Nicalon fibers having C-interfaces. Crack velocities are determined as a function of applied stress intensity and time for varying O2 levels. Results are presented for crack velocity-stress intensity relationships in pure Ar and in Ar plus 2000-, 5000-, 10,000-, and 20,000-ppm O2 atmospheres at 1100°C. A 2D micromechanics model is used to represent the time-dependence of observed crack bridging events and is able to rationalize the observed phenomena.