Modeling friction: From nanoscale to mesoscale

Vanossi, Andrea; Manini, Nicola; Urbakh, Michael; Zapperi, Stefano; Tosatti, Erio

doi:10.48550/arxiv.1112.3234

Cited by 2 publications

(2 citation statements)

References 195 publications

(263 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Actually, while MD simulations are quite valuable in qualitatively catching the physics of microscopic friction between extended solids, a quantitative agreement with experimental results is still beyond hopes 3 . Besides the practical difficulty posed by the necessity to describe inter-atomic interactions by either empirical force fields or with costly first principles calculations, an additional weak point of MD simulations lies in the impossibility to access the experimental time scales 4 .…”

Section: Introductionmentioning

confidence: 99%

Optimal Energy Dissipation in Sliding Friction Simulations

et al. 2012

View full text Add to dashboard Cite

Non-equilibrium molecular dynamics simulations, of crucial importance in sliding friction, are hampered by arbitrariness and uncertainties in the removal of the frictionally generated Joule heat. Building upon general pre-existing formulation, we implement a fully microscopic dissipation approach which, based on a parameter-free, non-Markovian, stochastic dynamics, absorbs Joule heat equivalently to a semi-infinite solid and harmonic substrate. As a test case, we investigate the stick-slip friction of a slider over a two-dimensional Lennard-Jones solid, comparing our virtually exact frictional results with approximate ones from commonly adopted dissipation schemes. Remarkably, the exact results can be closely reproduced by a standard Langevin dissipation scheme, once its parameters are determined according to a general and self-standing variational procedure

show abstract

Section: Introductionmentioning

confidence: 99%

Optimal Energy Dissipation in Sliding Friction Simulations

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Confined lubricants under shear and high pressure display, both experimentally [1][2][3] and theoretically [4][5][6][7][8][9], intriguing nano-and meso-scale tribological phenomena. The intervening lubricant film between two sliding solid surfaces generally changes from liquid (with hydrodynamic lubrication), to solid or nearly solid at high pressure when the film is only a few monolayers thick.…”

Section: Introductionmentioning

confidence: 99%

High-pressure lubricity at the meso- and nanoscale

et al. 2013

View full text Add to dashboard Cite

The increase of sliding friction upon increasing load is a classic in the macroscopic world. Here we discuss the possibility that friction rise might sometimes turn into a drop when, at the mesoscale and nanoscale, a confined lubricant film separating crystalline sliders undergoes strong layering and solidification. Under pressure, transitions from N to N-1 layers may imply a change of lateral periodicity of the crystallized lubricant sufficient to alter the matching of crystal structures, influencing the ensuing friction jump. A pressure-induced friction drop may occur as the shear gradient maximum switches from the lubricant middle, marked by strong stick-slip with or without shear melting, to the crystalline slider-lubricant interface, characterized by smooth superlubric sliding. We present high pressure sliding simulations to display examples of frictional drops, suggesting their possible relevance to the local behavior in boundary lubrication

show abstract

Modeling friction: From nanoscale to mesoscale

Cited by 2 publications

References 195 publications

Optimal Energy Dissipation in Sliding Friction Simulations

Optimal Energy Dissipation in Sliding Friction Simulations

High-pressure lubricity at the meso- and nanoscale

Contact Info

Product

Resources

About