Molecular Dynamics Simulation of Ferrofluid Lubrication on the Interface of Babbitt Alloy
Ferrofluids can meet the continuously improving stability requirements of lubricating oil film of sliding bear-ing under extreme working conditions due.to its paramagnetic controllable rheological properties,and have a good applica-tion prospect in bearing lubrication.To explore the micro lubrication mechanism of ferrofluids,the microscopic model of fer-rofluid lubrication on the interface of babbitt alloy was constructed and optimized by molecular dynamics simulation meth-od,and the confined shear simulation was carried out according to the actual working conditions.The effects of temperature and shear rate on the lubrication behavior of PAO6-based ferrofluid on the interface of babbitt alloy were studied.Through the analysis of the relative concentration distribution,temperature distribution,velocity distribution,mean square displace-ment and interface adsorption energy during the sliding process,the mechanism of ferrofluid micro-lubrication was revealed from the molecular level.The results show that the PAO6-based ferrofluid has good stability and heat dissipation,and can adhere to the friction interface of babbitt alloy to play a good role in bearing and reducing wear.At high temperatures and high shear speeds,the magnetic liquid lubricating film still exhibits good stability,and the magnetic particles have good dif-fusion.The research results are helpful to improve the lubrication theory of nano-film and have practical significance for the engineering application of ferrofluids.
ferrofluidmolecular dynamics simulationthin film lubricationbabbitt alloysliding bearing
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