Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F16: DSOFT Early Career and Student Awards Session
8:00 AM–11:00 AM,
Tuesday, March 7, 2023
Room: Room 208
Sponsoring
Unit:
DSOFT
Chair: Rae Robertson-Anderson, University San Diego
Abstract: F16.00005 : Slow relaxations in disordered mechanical systems - aging on the verge of instability
9:12 AM–9:24 AM
Presenter:
Dor Shohat
(Tel Aviv University)
Authors:
Dor Shohat
(Tel Aviv University)
Yaniv Friedman
(Tel Aviv University)
Yoav Lahini
(Tel Aviv University)
Through experiments in crumpled sheets and simulations of a simplified mechanical model, we reveal a general mechanism underlying slow relaxation phenomena. We show that under load, these systems self-organize to a metastable state which is poised on the verge of a local instability, where they can remain for long, but finite times. The system’s relaxation advances via a series of instabilities, each resulting in an avalanche, occurring on short timescales compared to the typical waiting times between instabilities. Crucially, we find that these waiting times increase as the system relaxes, due to the release of internal stress that leads to a slow increase in the effective energy barriers. This, we show, naturally leads to an overall logarithmic relaxation.
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