Nonmonotonic Aging and Memory in a Frictional Interface

Sam Dillavou, Shmuel M. Rubinstein

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


We measure the static frictional resistance and the real area of contact between two solid blocks subjected to a normal load. We show that following a two-step change in the normal load the system exhibits nonmonotonic aging and memory effects, two hallmarks of glassy dynamics. These dynamics are strongly influenced by the discrete geometry of the frictional interface, characterized by the attachment and detachment of unique microcontacts. The results are in good agreement with a theoretical model we propose that incorporates this geometry into the framework recently used to describe Kovacs-like relaxation in glasses as well as thermal disordered systems. These results indicate that a frictional interface is a glassy system and strengthen the notion that nonmonotonic relaxation behavior is generic in such systems.

Original languageAmerican English
Article number224101
JournalPhysical Review Letters
Issue number22
StatePublished - 1 Jun 2018
Externally publishedYes

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© 2018 American Physical Society.


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