Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B16: Theory and Numeric Simulations of Glasses
11:30 AM–1:30 PM,
Monday, March 6, 2023
Room: Room 208
Sponsoring
Units:
DSOFT GSNP
Chair: Robert Dennis, University of Pennsylvania and Syracuse University
Abstract: B16.00008 : Temperature and driving rate effects on the yielding transition of amorphous solids*
12:54 PM–1:06 PM
Presenter:
Daniel J Korchinski
(University of British Columbia)
Authors:
Daniel J Korchinski
(University of British Columbia)
Joerg Rottler
(University of British Columbia)
The yielding transition in amorphous solids is well studied in the athermal and quasistatic (AQS) limit, where its jerky, avalanching flow is an exemplary realization of self-organized criticality. Crucially, the critical exponents of these avalanches present in quasistatic driving have been connected to the Herschel-Bulkley (HB) exponent that governs the macroscopic response of the material to high driving rates. Here, by equipping a mesoscale elastoplastic model (EPM) for amorphous plasticity with a temperature dependent yielding of weak sites, we investigate how the yielding transition is affected by temperature. We find that avalanche sizes can be truncated by either temperature or finite-size effects and derive a dynamic phase diagram capturing the onset of continuous flow as a function of temperature, driving rate, and system size [1]. We find that in the continuously flowing phase, the HB exponent transitions to a lower value when the temperature is high [1]. We present scaling arguments that connect the smaller temperature truncated avalanches to this high-temperature HB exponent and compare this to alterations in HB scaling found in a related mean-field model.
[1] D. Korchinski and J. Rottler, Dynamic Phase Diagram of Plastically Deformed Amorphous Solids at Finite Temperature, Phys. Rev. E 106, 034103 (2022).
*This research was undertaken thanks, in part, to funding from the Max Planck-UBC-UTokyo Center for Quantum Materials and the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program. Financial supported was also provided by the NSERC:PGSD.
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