Chapter 43. The Orthotropic Mechanical Behavior of Nicalon® Fiber-Reinforced SiC-Matrix Composites

  1. John B. Wachtman Jr.
  1. Wayne S. Steffier

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314234.ch43

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

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

Author Information

  1. Hyper-Therm, Inc. Huntington Beach, California, 92648

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375273

Online ISBN: 9780470314234

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Keywords:

  • density;
  • orientation;
  • interlaminar;
  • geometrically;
  • thermal shock resistance

Summary

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.