Sliding without slipping under Coulomb friction: opening waves and inversion of frictional force

TL;DR

This paper investigates how an elastic layer slides on a rigid surface under Coulomb friction, revealing that high friction coefficients induce complex wave phenomena like opening waves and force inversion, with implications for understanding slip dynamics.

Contribution

It introduces the concept of opening waves and force inversion during sliding under Coulomb friction, providing a detailed mechanism and parametric analysis of these phenomena.

Findings

High friction leads to localized stick-slip pulses.

Opening waves can propagate at intersonic or supersonic speeds.

Frictional force can invert direction during wave propagation.

Abstract

An elastic layer slides on a rigid flat governed by Coulomb's friction law. We demonstrate that if the coefficient of friction is high enough, the sliding localizes within stick-slip pulses, which transform into opening waves propagating at intersonic speed in the direction of sliding or, for high Poisson's ratios, at supersonic speed in the opposite direction. This sliding mode, characterized by marginal frictional dissipation, and similar to carpet fold propagation, may result in inversion of the frictional force direction; at longer time intervals the system demonstrates stick-slip behavior. The mechanism is described in detail and a parametric study is presented.