About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Ceramic Matrix Composites
|
| Presentation Title |
Size-dependent Toughness and Strength in Defective SiC and Diamond Nanowires |
| Author(s) |
Zubaer Hossain |
| On-Site Speaker (Planned) |
Zubaer Hossain |
| Abstract Scope |
Defects play a major role in altering the mechanical properties of brittle materials. Yet quantification of toughness and strength degradation in brittle nanowires remains a major challenge due to the associated reduced dimension and difficulty in taking into account the effects of surface and its interaction with a neighboring defect. In this talk, we will present a theoretical and computational understanding of the role of defects of different sizes in governing the strength and toughness behavior of diamond and SiC nanowires of different sizes and shapes. Our results suggest that with decreasing diameter both strength and toughness decrease as a direct consequence of surface softening and geometric confinement of elastic deformation at the defective sites in the nanowire. The defective regime and the surface soften the nanowire and carry the maximum angular deformation at the expense of breaking local symmetry of the atomic structure. |