Molecular dynamics simulations of sliding in an Fe–Cu tribopair system

Karthikeyan, S.; Agrawal, A. K.; Rigney, D.A.

doi:10.1016/j.wear.2009.01.032

Cited by 62 publications

(50 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5,6,7,8,9, the change in the sliding velocity of the asperity did not produce any consistent and significant change in the forces and the effective friction coefficient. This is in contradiction to several reported results on asperity sliding friction (Yang and Komvopoulos 2005;Karthikeyan et al 2009;Lin et al 2007). Karthikeyan et al (2009) have reported a fivefold increase in the friction coefficient when the sliding velocity of copper block on an iron block was increased from 300 to 1,000 m/s.…”

Section: Effect Of Sliding Velocity Vcontrasting

confidence: 99%

“…This is in contradiction to several reported results on asperity sliding friction (Yang and Komvopoulos 2005;Karthikeyan et al 2009;Lin et al 2007). Karthikeyan et al (2009) have reported a fivefold increase in the friction coefficient when the sliding velocity of copper block on an iron block was increased from 300 to 1,000 m/s. It should be noted that this sliding velocity is in a different range than that considered in the current work.…”

Section: Effect Of Sliding Velocity Vcontrasting

confidence: 99%

“…These values of velocity represent the velocities commonly encountered in MEMS/NEMS devices (Ping and NingBo 2007;Karthikeyan et al 2009;Pei et al 2007). For example, a high temperature micro gas turbine has a rotational speed that would translate into a sliding velocity of over 500 m/s (Bhushan 2007).…”

Section: Effect Of Sliding Velocity Vmentioning

confidence: 99%

See 2 more Smart Citations

Molecular scale analysis of dry sliding copper asperities

2014

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Sliding Velocity Vcontrasting

confidence: 99%

Section: Effect Of Sliding Velocity Vcontrasting

confidence: 99%

See 1 more Smart Citation

Molecular scale analysis of dry sliding copper asperities

2014

View full text Add to dashboard Cite

show abstract

“…Vortices exhibit the same size scale of individual grains in nanostructured phases and can be associated with both chemical mixing and the formation of the nanostructure under dynamic deformation conditions. [69][70][71][72][73][74] The deposition of kinetic energy accompanying the mechanical deformation not only promotes the refinement of the system microstructure, but also abrasion and fracture. [75][76][77] Due to its importance for human activities, fracture has been widely studied, particularly with the aim of identifying criteria for the nucleation and propagation of cracks.…”

Section: Friction Wear and Fracturementioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

View full text Add to dashboard Cite

The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

show abstract

“…Molecular dynamics (MD) simulations have been performed comprehensively by Rigney and coworkers to show structure formation at the sliding interface of pure crystalline materials [1][2][3][4]. Although only a two-dimensional (2D) model was applied, the following features were visualized on the atomic scale: (i) mixing of the two first body materials; (ii) evolution of defect potential energy in the vicinity of the interface and (iii) formation of nanocrystalline structures [1].…”

Section: Introductionmentioning

confidence: 99%

MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

2016

View full text Add to dashboard Cite

Abstract:The sliding behaviors of two simplified tribofilms with amorphous structure consisting either of SiO 2 molecules or C atoms were simulated by molecular dynamics modeling. The objective was to identify mechanisms explaining the experimentally observed lubricating properties of the two amorphous films. The impacts of layer thickness, normal pressure, temperature and different substrate materials were studied systematically, while the sliding velocity was kept constant at 30 m/s. While the layer thickness was not critical, all the other parameters showed special effects under certain conditions. Normal pressure impeded void formation and could even eliminate voids if applied at high temperature. Stick-slip sliding was changed to smooth sliding at high temperature due to void healing. Considering the carbon film, high friction forces and shearing of the entire film was observed with diamond substrates, whereas interface sliding at low friction forces and an amorphous layer of iron mixed with carbon was observed if the supporting substrates consisted of α-Fe. Both films show a decrease of friction forces and smooth sliding behavior at elevated temperature, corresponding well to the tribological behavior of an advanced nanocomposite sliding against a steel disc under severe stressing conditions when high flash temperatures can be expected.

show abstract

Molecular dynamics simulations of sliding in an Fe–Cu tribopair system

Cited by 62 publications

References 22 publications

Molecular scale analysis of dry sliding copper asperities

Molecular scale analysis of dry sliding copper asperities

Hallmarks of mechanochemistry: from nanoparticles to technology

MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

Contact Info

Product

Resources

About