| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
In-Situ Microscale Evaluation of Damage Progression in SiC/BN/SiC Ceramic Matrix Composites |
| Author(s) |
Hunter Gross, Michelle Harr, Alicia Rossi, Nathan Klingbeil, Kaitlin Detwiler |
| On-Site Speaker (Planned) |
Hunter Gross |
| Abstract Scope |
SiC/BN/SiC ceramic matrix composites (CMCs) are being used in extreme environments, such as the hot sections of turbine engines due to their high heat resistance, relatively low densities, and high fracture toughness. Understanding how damage (i.e. micro-cracking) propagates with respect to material microstructure is vital for predicting in-service material performance. Damage initiation and propagation was observed from in-situ tensile tests in a scanning electron microscope (SEM) at room temperature. Small-scale dogbone coupons were machined and some coupons were notched prior to testing. The notched dogbones were tensile-tested and paired with digital image correlation (DIC) to measure SiC/BN/SiC response to load. Specifically, DIC was used to produce full field strain maps around microstructural features of interest, including longitudinal and transverse fibers and coatings. Measurements such as crack opening displacement and crack spacing were taken from un-notched specimens. Initial results demonstrating use of the techniques with measurements will be presented. |