Off-Axis Creep Behavior of Oxide/Oxide Nextel(Trademark)720/AS-0 (Preprint)
Abstract
Oxide/Oxide Ceramic Matrix Composites (CMC) are currently being demonstrated in high-temperature aerospace applications where their oxidation resistance is critical to a successful design. Many applications are engine components that are axisymmetric in shape and subject to axisymmetric thermal and mechanical loadings. Traditionally woven CMC materials used in these components are typically made from 0 deg/90 deg fiber architectures. In many cases the highest stresses are not always coincident with the orientation of the reinforcing fibers. Therefore, these components may experience stress states that approach the off-axis tensile and creep strengths of the material. The oxide/oxide CMC investigated in this study was Nextel(trademark)720/AS. Nextel(trademark)720/AS is composed of an Alumina-Silica matrix reinforced with an eight-harness stain weave (8HSW) of Nextel(trademark)720 fibers. Tensile and creeps tests at 1100 C on +/- 45 deg Nextel(trademark)720/AS were performed to characterize the off-axis material behavior. The +/- 45 deg orientation has approximately two thirds the ultimate tensile strength of the 0 deg/90 deg orientation. However, the tensile toughness of the + or - 45 deg orientation was higher than the 0 deg /90 deg orientation by a factor of 2X. The creep rupture strength at 100 hrs for the + or - 45 deg orientation was approximately one third that of the 0 deg/90 deg orientation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2006
- Accession Number
- ADA466791
Entities
People
- Dennis J. Buchanan
- Larry P. Zawada
- Reji John
Organizations
- University of Dayton