Chapter 43. The Orthotropic Mechanical Behavior of Nicalon® Fiber-Reinforced SiC-Matrix Composites
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10
How to Cite
Steffier, W. S. (1993) The Orthotropic Mechanical Behavior of Nicalon® Fiber-Reinforced SiC-Matrix Composites, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch43
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375273
Online ISBN: 9780470314234
- thermal shock resistance
Continuous Nicalonr̀ fiber-reinforced SiC-matrix composites produced by chemical vapor infiltration (CVI) were developed and evaluated for potential applications demanding high-temperature strength and toughness. Laminated composite plates were fabricated using woven, 8-harness satin Nicalonr̀ fabric with a fiber volume fraction of 36% and uniformly densified with CVI-SiC to an 88% theoretical density level, corresponding to a bulk density of 2.54 gm/cm3. Three (3) eight-ply laminate lay-up architectures were fabricated and experimentally evaluated to determine the composite sensitivity to fiber orientation, namely: (1) cross-ply (0/90)2s, (2) quasi-isotropic (0/±45/90)s, and (3) bias-ply (±45)2s- Room-temperature uniaxial tension, 4-point flexure, in-plane shear, single edge-notched fracture, and interlaminar shear testing was performed to establish the fiber and matrix dominated mechanical behavioral dependence on laminate lay-up. The results of indicate that while Nicalonr̀ SiC/CVI-SiC composites exhibit highly nonlinear stress-strain behavior with high strain-to-failure, they exhibit subtle mechanical orthotropy with little influence on laminate lay-up, or fiber orientation.