An investigation of nanoscale tribological characteristics under different interaction forces

Jeng, Yeau-Ren; Su, Chien-Chan; Lay, Yeong-Tsyh

doi:10.1016/j.apsusc.2007.01.123

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…These were governed by indentation depth, sliding speed, asperity geometry, and surface conditions. Investigation of the simple case of a single asperity sliding over a flat surface using MD has also been carried out by several other research groups (Cho et al 2005;Jeng et al 2007;Yang and Komvopoulos 2005;Zhu et al 2011;Zhang et al 2001;Ivashchenko and Turchi 2006). However, an important aspect of the frictional sliding process between rough surfaces is the interaction between two separate asperities rather than an asperity and a flat surface.…”

Section: Introductionmentioning

confidence: 99%

Molecular scale analysis of dry sliding copper asperities

2014

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A fundamental characterization of friction requires an accurate understanding of how the surfaces in contact interact at the nano or atomic scales. In this work, molecular dynamics simulations are used to study friction and deformation in the dry sliding interaction of two hemispherical asperities. The material simulated is copper and the atomic interactions are defined by the embedded atom method potential. The effect of interference, d, relative sliding velocity, v, asperity size, R, lattice orientation, h, and temperature control, on the friction characteristics are investigated. Extensive plastic deformation and material transfer between the asperities were observed. The sliding process was dominated by adhesion and resulted in high effective friction coefficient values. The friction force and the effective friction coefficient increased with the interference and asperity size but showed no significant change with an increase in the sliding velocity or with temperature control. The friction characteristics varied strongly with the lattice orientation and an average effective friction coefficient was calculated that compared quantitatively with existing measurements.

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