| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
Nanomechanics of Amorphous Silica: From Mechanical to Fracture Properties |
| Author(s) |
Pania Newell, Truong Vo, Bang He, Michael Blum, Angelo Damone |
| On-Site Speaker (Planned) |
Pania Newell |
| Abstract Scope |
Porous materials are typically heterogeneous containing pores of different shapes and sizes ranging from nanoscale to macroscale. In continuum scales, mechanical properties of porous materials are estimated by considering porosity, while the underlying variations in nano/micro pore structures are typically ignored. This presentation numerically investigates the effect of nanopore structure in addition to porosity on mechanical and fracture properties of amorphous silica (a-SiO2). Various pore shapes (e.g., circular, square, and triangular) and sizes were selected based on the experimental observation of pores in SiO2-based materials. Molecular dynamics simulations coupled with the-state-of-the-art reactive force field (ReaxFF) have been adopted for this investigation. The results revealed that the variation in the nanopore structure influences Young’s modulus and critical energy release rate (GIC) of a-SiO2. In particular, for the same exact porosity, the circular pore has the highest impact on Young’s modulus, while the square pore has the most influence on GIC. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Ceramics, Other |