Influence Of Different Parameters On The Thermo-mechanical Coupling Of The Rough Surface To Flat Surface During Sliding Contact

Real engineering surface contains peaks and valleys which can calledasperities. Actually, the contact area between two surfaces occurs only at theasperities, which carry high loads and are prone to elasto-plastic deformation.The frictional heat generated between the contacting surfaces when they startsto move for each other without uniform distribution is vital to the mechanical andphysical properties. Which also makes the interactions of the stress amongasperities more complicated, and it is not only to intensify the damage anddeformation for the asperities under the high loads, but it also complicates thetribological phenomena of the components from a macro view, such as stick-slip,adhesion and wear etc.. Obviously, it is significantly important both in theoryand in practice to study the material behavior of contacting components underdry sliding condition, especially the transient thermo-mechanical analysis of theinteractions among asperities from a micro scale.The recent numerical research of dry sliding contact was reviewed and thetrend of the field has been pointed out. Based on the MB model and consideringthe fully coupled thermal and mechanical effects, an elasto-plastic3-D modelcontaining a flat plane and a fractal rough surface contact which can sliding alongeach other has been constructed. The model was solved using the commercialFEM software ABAQUS. Focus on the long compute consuming time of the finiteelement analysis, through reasonable mesh of the model and use the substructuremethod to accelerate the analysis. The result of the numerical simulations of thecontact area, temperature field, pressure field and stress field are analyzed bycurves and clouds map. In addition, compared the maximum temperature, contactpressure and VonMises equivalent stress in the different parameters conditionsversus the simulated time on the contact interface.In this paper, the transient thermo-mechanical analysis of the model by usingthe finite element method shows that the distribution of the temperature field, contact pressure, equivalent stress and plastic deformation and theirrelationships, reveals the changing process of the real contact area and therough body deformation. The real contact area increases linearly with appliedload and fluctuates during sliding, and is similar under different frictioncoefficients reflect that load is the primary factor for it. The contact pressure andtemperature distribute mainly at the asperities in real contact. It is shown thatthe maximum stress and the maximum temperature lies the subsurface which canbe used to explain the failure of material. Point out the depth direction of thetemperature change tendency; it may easily form "hot spot" for the largetemperature gradient. The regulation of variation and influence amongmaximum temperature, contact pressure and VonMises equivalent stress isdiscussed. The effects of different friction coefficients change the maximumtemperature, contact pressure and stress.The conclusions of this paper are helpful to reduce the influence of frictionheat to the contact status of rough surfaces effectively in the engineering, andare also valuable to the further development of the topic.