Research On The Absorption And Friction Properties Of Graphene Based On Molecular Dynamics Simulations

Graphene is a planar film composed of carbon atoms with sp2 hybridized orbital to form hexagonal honeycomb lattice.It has many excellent properties,especially the excellent mechanical properties,which make graphene become a kind of wear-reducing material in many fields.The main material of micro-displacement actuators in astronomical telescopes is stainless steel.Reducing the surface friction and wear can effectively guarantee the precision and stability of astronomical telescopes.Graphene material becomes an ideal choice to reduce friction.In this paper,the friction characteristics of stainless-steel substrate graphene will be investigated in detail from a microscopic perspective through molecular dynamics.First of all,starting from the state of the friction material itself,this dissertation established a variety of stainless steel microstructure models through molecular dynamics,and explored the adsorption state of graphene on the stainless steel surface,as well as the change rule of graphene adsorption energy and adsorption force on the surface of stainless steel with different microstructure.Further research was conducted on the curvature maximums and morphology of the important factors affecting the graphene adsorption state in the microstructure,so as to obtain more comprehensively the influence rules of stainless-steel substrate on the surface graphene state,providing a basis for friction research.Secondly,a single peak friction model of stainless-steel substrate graphene was established to explore the friction law of different layers of graphene in stainless steel substrate at different temperatures.The effect of tip slip velocity on different layers of graphene in stainless steel substrate;Effects of the deformation of graphene under normal loading on different layers of graphene in stainless steel substrates.Based on the analysis of relevant results,the friction characteristics of stainless-steel substrate graphene were revealed,and the layer dependence of stainless-steel substrate graphene was obtained.Finally,based on the layer dependence of graphene obtained from the friction law of stainless-steel substrate,the friction study of graphene on rough stainless-steel substrate and microstructure stainless steel surface was further carried out.According to the influence of microstructure on the adsorption state of graphene,representative microstructure was selected to explore the influence of the reappearance of stainless-steel substrate on graphene layer dependence.Rough stainless-steel substrate was randomly generated to investigate the effect of rough stainless steel on the layer dependence of surface fluctuation graphene.Combined with the two factors,the layered dependence rule of graphene on rough stainless-steel surface was explored more completely.