| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Glasses, Optical Materials, and their Functional Applications: Current Issues in Science & Technology
|
| Presentation Title |
Relative Roles of O and Si in Crack Nucleation and Propagation Mechanisms in Amorphous Silica |
| Author(s) |
Zubaer Hossain |
| On-Site Speaker (Planned) |
Zubaer Hossain |
| Abstract Scope |
The mechanical behavior of glass has been the subject of active research for many decades. Yet the underlying mechanisms that govern crack nucleation and propagation in glass remains less understood. In this talk, we will present an atomistic scale understanding of the role of Si and O atoms in governing the crack nucleation and propagation criteria in amorphous silica. Our results suggest that both crack nucleation and propagation are governed by chainlike nanoscale virial stress-fibers formed by an intricate mixture of Si and O atoms. Additionally, the virial stress fields in the domain are highly heterogeneous and species-dependent -- and the O and Si atoms play fundamentally distinct roles throughout the deformation process. With increased loading, heterogeneity in virial stress for the Si atoms goes up, whereas for the O atoms it goes down. |