Chapter 43. Failure Behavior of a 2-D Woven Sic Fiber/Sic Matrix Composite at Ambient and Elevated Temperatures
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1992 The American Ceramic Society
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8
How to Cite
Nair, S. V. and Wang, Y.-L. (1994) Failure Behavior of a 2-D Woven Sic Fiber/Sic Matrix Composite at Ambient and Elevated Temperatures, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313954.ch43
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375174
Online ISBN: 9780470313954
The failure behavior of a 2-D woven SiC fiber/SiC matrix composite at ambient and elevated temperatures was studied by characterizing the R-curve behavior at ambient temperature and at 1200°C using compact tension fracture mechanics specimens. A rising R-curve behavior was observed at ambient temperature caused by fiber bridging and microcracking in the crack wake. Significant toughening was also generated by microcracking in the crack front zone. The R-curve effect at ambient temperature was substantially reduced at 1200°C as a result of degradation of the Nicalon fibers. Delamination crack growth was observed at 1200° indicative of a weakened fiber/matrix interface. Toughening at elevated temperature appears to result from a combination of crack branching and microcracking.