Noise spectra in the reversible-irreversible transition in amorphous solids under oscillatory driving
Abstract
We study the stress fluctuations in simulations of a two-dimensional amorphous solid under a cyclic drive. It is known that this system organizes into a reversible state for small driving amplitudes and remains in an irreversible state for high driving amplitudes, and that a critical driving amplitude separates the two regimes. Here we study the time series of the stress fluctuations below and above the reversible-irreversible transition. In the irreversible regime above the transition, the power spectrum of the stress fluctuations is broad and has a 1/fα shape with 1 < α < 2. We find that the low frequency noise power peaks near the stress at which dc yielding occurs, which is consistent with the behavior expected in systems undergoing a non-equilibrium phase transition.
- Publication:
-
Modelling Simul. Mater. Sci. Eng.
- Pub Date:
- December 2019
- DOI:
- 10.1088/1361-651X/ab33b1
- arXiv:
- arXiv:1905.00106
- Bibcode:
- 2019MSMSE..27h4004R
- Keywords:
-
- reversible–irreversible transition;
- amorphous solids;
- noise spectra;
- Condensed Matter - Soft Condensed Matter;
- Condensed Matter - Materials Science
- E-Print:
- 9 pages, 8 figures