| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Glasses and Optical Materials: Current Issues and Functional Applications
|
| Presentation Title |
Viscoelastic Relaxation in Silica via Reactive Molecular Dynamic Simulations |
| Author(s) |
Jessica Rimsza, Scott Grutzik |
| On-Site Speaker (Planned) |
Jessica Rimsza |
| Abstract Scope |
Silica glass can exhibit rate dependent effects during elastic deformation, termed viscoelasticity. To explore this phenomena, reactive molecular dynamic simulations of silica glass using the ReaxFF forcefield were performed. Silica glass structures with a slit crack were loaded through application of far field loading and allowed to relax over time and at varying temperatures (300K, 600K and 900K). Defining viscoelastic behaviors including stress relaxation over time and temperature dependence were evaluated and changes in the glass structure were quantified, both globally and as a function of distances from the crack tip. Results were used to identify the type of structural transitions that are tied to viscoelastic relaxation and how they may factor in the slow crack growth process. Finally, the influence of water and composition on viscoelastic relaxation were explored. |