Modeling And Study Of Sliding Contact Between Coated Plate And Coated Tool By Semi-analytical Method In Three Dimensional Thermoelastic Domain

In the mechanical system,contact and friction are generated by the mutual cooperation of various parts,which result in many problems related to contact mechanics,such as sliding bearing,gasket seal,gear transmission and so on.In the field of contact mechanics,the contact problem of the indenter-coated plate system has always been the focus of contact mechanics research.In recent years,the research of this problem has been developed rapidly with the efforts of numerous researchers,but the contact problem of the indenter-coated plate system is still of high research value.Therefore,the contact mechanical behavior research for the indenter-coated plate system under the three-dimensional thermoelastic domain can not only improve the research content of contact mechanics,but also has great guiding value to engineering practice.In order to solve the sliding contact problem of the indenter-coated plate system under the three-dimensional thermoelastic domain,the mathematical model of contact problems in the indenter-coated plate system has been established,with the formulas of heat distribution,stress and displacement of the coated plate being derived.In this paper,all numerical calculations are complied by Fortran program.The contact pressure,temperature rise and displacement response are analyzed for the spherical/ellipsoid/cylindrical indenter-coated plate system under the combined action of the heat source and the external pressure,and the influences of material parameters of the substrate and the coating layer and the shape and size of the indenter on the system response are studied.As a result,the thermodynamic contact behavior of the indenter-coated plate system has been discussed.The main research results and conclusions are as followsFor the spherical indenter,external conditions such as sliding velocity,coating thickness,indenter shape and friction coefficient mainly affect the contact pressure,the surface temperature rise and the surface displacement.To be specific,the contact pressure,the temperature rise and displacement go up with the increasing of the sliding velocity,and coating thickness,indenter radius and other parameters can affect the contact system to different degrees.And thus,the material properties and external contact conditions should be taken into full consideration when the coating treatment is carried out for the actual engineering conditions,so as to select the most reasonable coating materials.For the coating and substrate systems of different indenter shapes,the most significant effect of the indenter shape on the system is the change of the contact area shape,which simultaneously alters the acting form of the force.The analysis results show that the influences of external conditions such as sliding speed and coating thickness on the system of other indenter shapes are basically the same as that on the system of spherical indenter.While the influence of material parameters on the system of ellipsoidal indenter is different from that of spherical indenter.Specifically,the main difference is that the substrate elastic modulusand the substrate poisson ratio have little influence on the system.And the big difference in the three kinds of indenter systems occurs in the variation law of the heat distribution coefficient,which is attributed to the change of boundary conditions.