Nonmonotonic Aging and Memory Retention in Disordered Mechanical Systems

Yoav Lahini, Omer Gottesman, Ariel Amir, Shmuel M. Rubinstein

Research output: Contribution to journalArticlepeer-review

Abstract

We observe nonmonotonic aging and memory effects, two hallmarks of glassy dynamics, in two disordered mechanical systems: crumpled thin sheets and elastic foams. Under fixed compression, both systems exhibit monotonic nonexponential relaxation. However, when after a certain waiting time the compression is partially reduced, both systems exhibit a nonmonotonic response: the normal force first increases over many minutes or even hours until reaching a peak value, and only then is relaxation resumed. The peak time scales linearly with the waiting time, indicating that these systems retain long-lasting memory of previous conditions. Our results and the measured scaling relations are in good agreement with a theoretical model recently used to describe observations of monotonic aging in several glassy systems, suggesting that the nonmonotonic behavior may be generic and that athermal systems can show genuine glassy behavior.

Original languageEnglish
Article number085501
JournalPhysical Review Letters
Volume118
Issue number8
DOIs
StatePublished - 21 Feb 2017
Externally publishedYes

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