Crystalline misfit-angle implications for solid sliding

Abstract

For the contact of two finite portions of interacting rigid crystalline surfaces, we compute the dependence of the pinning energy barrier on the misfit angle and contact area. The resulting data are used to investigate the distribution of static frictional thresholds for a contact of polycrystal surfaces, as occurs at the touching points of dry or even lubricated friction. The simplicity of the model allows us to investigate a broad contact-size and angular range, thus obtaining the statistical properties of the energy barriers opposing sliding for a single asperity. These statistical properties are used as the input of a master-equation model to predict the sliding properties of two macroscopic surfaces in contact. The model is consistent with the well-established result that low temperature should generally favor stick-slip motion, while at high temperature sliding should be smooth.

11 pages, including 7 figures

References in corpus (8)

• Atomistic simulations of the sliding friction of graphene flakes
• Simulations of the Static Friction Due to Adsorbed Molecules
• Stability of superlubric sliding on graphite
• Modeling friction on a mesoscale: Master equation for the earthquake-like model
• Master equation approach to friction at the mesoscale
• Dependence of boundary lubrication on the misfit angle between the sliding surfaces
• Role of transverse displacements for a quantized-velocity state of the lubricant
• Tribology of the lubricant quantized-sliding state

Cited by in corpus (5)

• Superlubricity - a new perspective on an established paradigm
• (In)commensurability, scaling and multiplicity of friction in nanocrystals and application to gold nanocrystals on graphite
• Friction and Nonlinear Dynamics
• Current trends in the physics of nanoscale friction
• Sliding states of a soft-colloid cluster crystal: Cluster versus single-particle hopping