Initial failure maps for fibrous CMC laminates
- Rensselaer Polytechnic Inst., Troy, NY (United States). Center for Composite Materials and Structures
A simple micromechanics-based procedure is used to evaluate initial failure maps for brittle composite laminates under combined in-plane loads and temperature changes. The maps are derived from local stresses in the fiber, matrix and at their interfaces, and from selected magnitudes of the respective strengths. In a particular loading plane or space, the maps indicate the damage-free load range of the laminate, and the source of likely initial failure by fiber or matrix cracking, or by fiber debonding. An application to Al{sub 2}O{sub 3}/MoSi{sub 2} laminates with unidirectional and (0/{+-}45){sub s} layups is presented. In this system, the thermal stresses are very small in the 1,200--20 C range; hence laminate failure is dominated by mechanical loads. Propensity to fiber debonding appears to limit the load magnitudes that can be safely applied to the angle-ply laminate.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 182662
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 78; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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