Chapter 47. Modeling of Nonlinear Constitutive Relations of Woven Ceramic Composites
- John B. Wachtman Jr
Published Online: 28 MAR 2008
Copyright © 1991 The American Ceramic Society, Inc.
Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8
How to Cite
Kuo, W.-S. and Chou, T.-W. (1991) Modeling of Nonlinear Constitutive Relations of Woven Ceramic Composites, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313831.ch47
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375099
Online ISBN: 9780470313831
This paper examines the linear and nonlinear tensile behavior of SiC/SiC fabric composites. The analysis is based on the observed stress-strain behavior and damage evolution from a series of loading and unloading tensile test experiments. The stress-strain relation is linear in response to the initial loading and becomes nonlinear when loading exceeds the proportional limit. Transverse cracking has been observed to be a dominant damage mode governing the nonlinear deformation. A fiber bundle model is adopted for the analysis, in which fiber undulations in the longitudinal and transverse directions have been taken into account. The fabrication-induced pores among fiber yarns have also been considered. The contribution of the matrix in the intertow space to the composite stiffness has been investigated. Two limiting cases of fabric stacking arrangements are studied, and solutions of the composite stiffness and Poisson's ratio have been obtained. The stress distribution of the composite with transverse cracks in the transverse yarns is evaluated, and the nonlinearity of the composite stress-strain relation due to the presence of transverse cracks is also predicted by applying a maximum failure strain criterion for the transverse yarn.