| タイトル | InSitu SEM Investigation of Microstructural Damage Evolution and Strain Relaxation in a Melt Infiltrated SiC/SiC Composite |
| 本文（外部サイト） | http://hdl.handle.net/2060/20160014887 |
| 著者（英） | Daly, Sam; Tracy, Jared; Sevener, Kathy; Chen, Zhe; Kiser, Doug |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2016-01-25 |
| 言語 | eng |
| 内容記述 | With CMC components poised to complete flight certification in turbine engines on commercial aircraft within the near future, there are many efforts within the aerospace community to model the mechanical and environmental degradation of CMCs. Direct observations of damage evolution are needed to support these modeling efforts and provide quantitative measures of damage parameters used in the various models. This study was performed to characterize the damage evolution during tensile loading of a melt infiltrated (MI) silicon carbide reinforced silicon carbide (SiC/SiC) composite. A SiC/SiC tensile coupon was loaded to a maximum global stress of 30 ksi in a tensile fixture within an SEM while observations were made at 5 ksi increments. Both traditional image analysis and DIC (digital image correlation) were used to quantify damage evolution. With the DIC analysis, microscale damage was observed at the fiber-matrix interfaces at stresses as low as 5 ksi. First matrix cracking took place between 20 and 25 ksi, accompanied by an observable relaxation in strain near matrix cracks. Matrix crack opening measurements at the maximum load ranged from 200 nm to 1.5 m. Crack opening along the fiber-matrix interface was also characterized as a function of load and angular position relative to the loading axis. This characterization was funded by NASA GRC and was performed to support NASA GRC modeling of SiC/SiC environmental degradation |
| NASA分類 | Nonmetallic Materials; Composite Materials |
| レポートNO | GRC-E-DAA-TN30806 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
