Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C47: Disordered and Glassy Systems
2:30 PM–5:30 PM,
Monday, March 5, 2018
LACC Room: 507
Sponsoring Units: GSOFT DCP GSNP
Chair: Yang Zhang, University of Illinois at Urbana–Champaign
Abstract: C47.00008 : Mechanical annealing of binary glasses: Effects of strain amplitude and temperature*
3:54 PM–4:06 PM
Molecular dynamics simulations are carried out to study the dynamic response of amorphous solids to oscillatory shear at finite temperatures. The data were collected from a poorly annealed binary glass, which was deformed periodically in the elastic regime during several hundred shear cycles. We found that the characteristic time required to reach a steady state with a minimum potential energy is longer at higher temperatures and larger strain amplitudes. With decreasing strain amplitude, the asymptotic value of the potential energy increases but it remains lower than in quiescent samples. The transient decay of the potential energy correlates well with a gradual decrease in the volume occupied by atoms with large nonaffine displacements. By contrast, the maximum amplitude of shear stress oscillations is attained relatively quickly when a large part of the system starts to deform reversibly.
*National Science Foundation (CNS-1531923).
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