Numerical Simulation Of Micro Rough Surface And Its Effect On Rolling Contact Fatigue Life

As is known, any processing method can’t process parts with an absolute smooth, and the actual parts surface has complex microstructure. When the study scale is too small or the working conditions of parts is very poor, the influence of microstructure on the surface of the parts will not be able to ignore. With rolling bearings as the application background, this paper developed point/surface contact model from the single roller and raceway contact and mainly study the impact of surface microscopic morphology on dry friction and elastohydrodynamic lubrication, and analyzed impact of surface microscopic morphology on the rolling bearing life under the condition of two kinds of working condition.By two-dimensional FIR digital filter and matrix linear transformation simulation method, gauss surface with exponential autocorrelation function, the root mean square and surface texture is generated by the MATLAB. Non-gauss surface with the specified root mean square, kurtosis and skewness, and non-Gaussian sequence transformation is generated by Johnson transformation system. From the target characterization parameters and the autocorrelation function, the two methods are compared.By ANSYS, the impact of microscopic surface morphology on point dry contact and rolling bearing life is analysed. This paper programs ANSYS APDL codes of the contact model of rough surface/ball model and the postprocessor, and study influence of root mean square, kurtosis, skewness, and texture on the maximum contact stress and contact area. Based on the life model of Zaretsky, the influence of the surface root mean square, kurtosis skewness, and texture features on substress distributation and the rolling bearing relative life is studied respectively.Using multigrid method to get a numerical solution of point contact isothermal elastohydrodynamic lubrication, the impact of surface microscopic morphology on rolling bearing life and isothermal elastohydrodynamic is studies through add rough surface data in the film thickness equation. For the surface of the gaussian and nongaussian, the impact of the root mean square, skewness, kurtosis and texture on film thickness and film pressure is studied respectively. Similarly, based on Zaretsky life model under the condition of complete elastohydrodynamic lubrication, the influence of the surface root mean square, kurtosis skewness, and texture features on substress and the rolling bearing life is studied respectively.