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Multiscale study of the dynamic friction coefficient due to asperity plowing
- Source :
- Friction 9(4), 822-839 (2021). doi:10.1007/s40544-020-0438-4, Friction
- Publication Year :
- 2021
- Publisher :
- Springer, 2021.
-
Abstract
- A macroscopically nominal flat surface is rough at the nanoscale level and consists of nanoasperities. Therefore, the frictional properties of the macroscale-level rough surface are determined by the mechanical behaviors of nanoasperity contact pairs under shear. In this work, we first used molecular dynamics simulations to study the non-adhesive shear between single contact pairs. Subsequently, to estimate the friction coefficient of rough surfaces, we implemented the frictional behavior of a single contact pair into a Greenwood-Williamson-type statistical model. By employing the present multiscale approach, we used the size, rate, and orientation effects, which originated from nanoscale dislocation plasticity, to determine the dependence of the macroscale friction coefficient on system parameters, such as the surface roughness and separation, loading velocity, and direction. Our model predicts an unconventional dependence of the friction coefficient on the normal contact load, which has been observed in nanoscale frictional tests. Therefore, this model represents one step toward understanding some of the relevant macroscopic phenomena of surface friction at the nanoscale level.<br />29 pages, 16 figures
- Subjects :
- Condensed Matter - Materials Science
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics
Mechanical Engineering
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Statistical model
02 engineering and technology
Mechanics
Plasticity
021001 nanoscience & nanotechnology
Surfaces, Coatings and Films
Molecular dynamics
020303 mechanical engineering & transports
0203 mechanical engineering
Shear (geology)
Rough surface
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
ddc:540
Surface roughness
Dynamical friction
0210 nano-technology
Nanoscopic scale
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Friction 9(4), 822-839 (2021). doi:10.1007/s40544-020-0438-4, Friction
- Accession number :
- edsair.doi.dedup.....1a0822a9af65ee9b82d65459fab8edac