About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XX
|
Presentation Title |
Stress-strain Measurements on Cyclically Sheared Colloidal Glasses |
Author(s) |
J. Zsolt Terdik, David A, Weitz, Frans A. Spaepen |
On-Site Speaker (Planned) |
J. Zsolt Terdik |
Abstract Scope |
Measuring the stress response of colloidal glasses, simultaneously with confocal visualization, presents a significant challenge. The micron size of the particles and thermal interaction energies result in exceptionally small elastic moduli, on the order to ~1Pa. We introduce a new technique, traction rheoscopy, in which a colloidal glass is deposited on a soft polymer gel with a calibrated shear modulus. This composite bilayer is sheared, and the shear stress is determined from the displacement of embedded tracer particles in the gel. We show that, as the stress develops, the colloidal glass goes through as sequence of reversible and irreversible microscopic rearrangements that result in spatial strain heterogeneities. We corroborate previously reported microscopic flow mechanisms and present new insight into the response of colloidal glass to shear. Our latest results are on a colloidal glass subjected to a series of cyclic strains, with maxima increasing from ~0.1% to 15%. |
Proceedings Inclusion? |
Planned: |
Keywords |
Shaping and Forming, Mechanical Properties, Other |