DATE:

Friday, May 29, 2020

TIME:

3:00 PM

LOCATION:

Virtual Zoom Conference

SPEAKER:

Dr. Mark Wilson, Computational Materials and Data Science, Sandia National Laboratory

ABSTRACT:

Silica-based glasses are increasingly becoming vital components in our current technology, from data transmission lines, to electronics, to optical lenses, to smartphone screens. These materials are inherently brittle and subject to failure under shock, non-equilibrium stress states, or corrosive environments. Identifying new compositions and processing conditions that result in improved fracture resistance (i.e. a higher fracture toughness) is achievable through materials design approaches. However, discovery primarily remains an empirically determined procedure. Atomistic molecular dynamics can be a powerful tool in this application, providing a capability to probe how glass breaks and what compositions or microstructural features result in better material performance. In this talk, a novel numerical method to determine the fracture toughness from atomistic material representations will be demonstrated on vitreous silica-based glass compositions. Process-structure-property connections will then be explored using this measure to highlight the relationships between processing conditions, chemical composition, microstructural content, and material performance.

Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.

HOST:

Arlette Baljon

VIDEO: