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Dry solid friction is often accompanied by force modulations originating from stick-slip instabilities. Here a distinct, quasi-static mechanism is evidenced leading to quasi-periodic force oscillations during sliding contact between an elastomer block, whose surface is patterned with parallel grooves, and finely abraded glass slides. The dominant oscillation frequency is set by the ratio between the sliding velocity and the period of the grooves. A mechanical model is proposed that provides a quantitative prediction for the amplitude of the force modulations as a function of the normal load, the period of the grooves and the roughness characteristics of the substrate. The models main ingredient is the non-linearity of the friction law. Since such non-linearity is ubiquitous for soft solids, this fingerprint effect should be relevant to a large class of frictional configurations and might in particular have important consequences in human (or humanoid) active digital touch.
We report here on experiments and simulations examining the effect of changing wall friction on the gravity-driven flow of spherical particles in a vertical hopper. In 2D experiments and simulations, we observe that the exponent of the expected power
In rubber friction studies it is often observed that the kinetic friction coefficient {mu} depends on the nominal contact pressure p. We discuss several possible origins of the pressure dependency of {mu}: (a) saturation of the contact area (and fric
We develop a microscopic picture of shear thickening in dense suspensions which emphasizes the role of frictional forces, coupling rotational and translational degrees of freedom. Simulations with contact forces and viscous drag only, reveal pronounc
We study the response to shear deformations of packings of long spherocylindrical particles that interact via frictional forces with friction coefficient $mu$. The packings are produced and deformed with the help of molecular dynamics simulations com
We consider the fracture of a free-standing two-dimensional (2D) elastic-brittle network to be used as protective coating subject to constant tensile stress applied on its rim. Using a Molecular Dynamics simulation with Langevin thermostat, we invest