| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
A Griffith's Theory-based Model for Strength of Silicon Nitride Nanoporous Membranes from Atomistic Simulation Perspective |
| Author(s) |
Ali K. Shargh, Gregory R. Madejski, James L. McGrath, Niaz Abdolrahim |
| On-Site Speaker (Planned) |
Ali K. Shargh |
| Abstract Scope |
Silicon nitride nanoporous membranes are extremely permeable ceramics that were first developed at University of Rochester. It was shown that range of working pressure and size of those nanostructures in biomedical applications are limited by their mechanical properties. We use molecular dynamics simulations to investigate mechanical behavior of amorphous nanostructures with porosity range of 5-40% and different pore arrangement and diameter. It is found that pore separation distance ratio (L1/L2) along with porosity play major role in controlling strength and fracture behavior of nanostructures. Depending on L1/L2 value, different networks of shear bands form in the nanostructure which further change its mechanical properties. A mathematical model based on Griffith’s theory is calibrated on MD results to predict the strength of nanostructure, which is further used to estimate burst pressure. The proposed model can be used as guideline for future manufacturing of robust nanostructures with enhanced mechanical properties at larger sizes. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Modeling and Simulation, Thin Films and Interfaces |