Predicting frictional ageing from bulk relaxation measurements
arXiv:2203.14895 · doi:10.1038/s41467-023-39350-3
Abstract
The coefficient of static friction between solids generally depends on the time they have remained in static contact before the measurement. Such frictional aging is at the origin of the difference between static and dynamic friction coefficients, but has remained difficult to understand. It is usually attributed to a slow increase in the area of atomic contact as the interface changes under pressure. This is however very difficult to quantify as surfaces have roughness at all length scales, and friction is not always proportional to the contact area. Here, we show that plastic flow of surface irregularities within a polymer-on-glass frictional interface exhibits identical relaxation dynamics as that of the bulk, allowing to predict the rate of frictional aging.
References in corpus (10)
- On the nature of surface roughness with application to contact mechanics, sealing, rubber friction and adhesion
- Finite-element analysis of contact between elastic self-affine surfaces
- Solid Friction from stick-slip to pinning and aging
- Crumpling a Thin Sheet
- Linking energy loss in soft adhesion to surface roughness
- Nonmonotonic Aging and Memory Retention in Disordered Mechanical Systems
- Nonmonotonic Aging and Memory in a Frictional Interface
- Shear Destruction of Frictional Aging and Memory
- Influences of microcontact shape on the state of a frictional interface
- A relaxation constant in the folding of thin viscoelastic sheets