Tensile behavior of unidirectional and cross-ply CMC`s
- Virginia Polytechnic Institute and State Univ., Blacksburg, VA (United States)
The tensile behavior of two ceramic matrix composites (CMC`s) was observed. The materials of interest in this study were a glass-ceramic matrix composite (GCMC) and a Blackglas{trademark} matrix composite, both reinforced with Nicalon (SiC) fibers. Both composites were produced in laminate form with a symmetric cross-ply layup. Microstructural observations indicated the presence of significant porosity and some cracking in the Blackglas{trademark} samples, while the GCMC samples showed considerably less damage. From the observed tensile behavior of the cross-ply composites, a {open_quote}back-out{close_quote} factor for determining the unidirectional, 0{degrees} ply data of the composites was calculated using Classical Lamination Theory (CLT) and compared to actual data. While the tensile properties obtained from the Blackglas{trademark} composites showed good correlation with the back-calculated values, those from the GCMC did not. Analysis indicates that the applicability of this technique is strongly influenced by the initial matrix microstructure of the composite, i.e., porosity and cracking present following processing.
- OSTI ID:
- 530699
- Report Number(s):
- CONF-9604124--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanical behavior of glass and Blackglas{reg_sign} ceramic matrix composite
Processing and mechanical properties of high temperature/high performance composites. Mechanism-based constitutive laws and design. Book 1. Annual report, 1 March 1992-28 February 1994