November 5-9, 2017
Silicon Carbide based Ceramic Matrix Composites (CMCs) are attractive materials for use in high-temperature applications in the aerospace industry. The performance and durability of a CMC depends on the properties of its constituents. Therefore, the limitations and damage mechanisms of CMC matrix and fiber reinforcement are discussed and characterized in representative simulated application conditions, and the dominant damage mechanisms at elevated temperatures are identified. The tensile creep behavior of single Hi-NicalonTM Type S and SylramicTM SiC fibers was characterized via testing and creep parameters were extracted. Fiber creep tests were performed in air or vacuum at 1200-1482°C under high stresses. In addition, the initiation and evolution of damage in Hi-NicalonTM Type S fiber-reinforced SiC/SiC minicomposites with different interphase thicknesses from different manufacturers was investigated utilizing nondestructive evaluation techniques such as acoustic emission (AE) and electrical resistance (ER), and microscopy. Moreover, fibers and minicomposites fracture surfaces were examined using SEM (scanning electron microscopy). The results were then correlated with the fibers’ and minicomposites’ ultimate tensile strengths. Fibers creep results were correlated with creep behavior of minicomposites and used to understand load sharing and the creep evolution of ceramic matrix composites. Future work plans will also be reviewed.
Amjad Almansour, "SiC fibers and SiC/SiC ceramic matrix minicomposites damage behavior" in "Advanced Ceramic Matrix Composites: Science and Technology of Materials, Design, Applications, Performance and Integration", Yutaka Kagawa, Tokyo University of Technology, Japan Dongming Zhu, NASA Glenn Research Center, USA Ram Darolia, GE Aviation (retired), USA Rishi Raj, University of Colorado, Boulder, USA Eds, ECI Symposium Series, (2017). https://dc.engconfintl.org/acmc/42