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Abstract
Reducing friction and wear in contact pairs is a formidable challenge in engineering applications. In this study, the influence of different particle distribution parameters on the flow field for elastohydrodynamic lubrication (EHL) friction pairs is analyzed using a multigrid method. In particular, the effects of the particle distribution density and location on the tribological properties are examined. A general Reynolds equation for an arbitrary non-Newtonian fluid is used to account for the non-Newtonian properties in the contact area. An inclusion-EHL model is established by coupling the flow field with the elastic field of heterogeneous particles below the contact surface, which are subject to eigenstrains. The results illustrate that the distribution density of the particles causes fluctuations in the film pressure and thickness and that the spacing ratio and position of the symmetry center have serious effects on the traction force. It is also found that the traction force can be effectively reduced by using a reasonable set of particle distribution parameters.
Highlights
Elastohydrodynamic lubrication (EHL) problems have the characteristics of high pressure, ultra-thin film thickness, high shear rates, deformation of the contact surface, and intense nonlinearities
An inclusion-elastohydrodynamic lubrication (EHL) model is established by coupling the flow field with the elastic field of heterogeneous particles below the contact surface, which are subject to eigenstrains
We have found that heterogeneous particles have a positive effect on improving the friction performance of EHL contact
Summary
Elastohydrodynamic lubrication (EHL) problems have the characteristics of high pressure, ultra-thin film thickness, high shear rates, deformation of the contact surface, and intense nonlinearities. The loads associated with EHL conditions are relatively high, and so the texturing and coating applied to the surface of the workpieces are worn during the running-in period of the mechanical parts, failing to achieve the desired lubrication improvement.. In using the multi-grid method to solve inclusion-EHL problems, it is not necessary for all the response points on the contact surface to participate in the iteration process at the same time. This reduction in the activity frequency of heterogeneous particle elements significantly improves the computational efficiency. Texturing reduces the friction at the contact interface of EHL, it is worn away because of its small structural size. The high wear rate of the texturing causes the contact pairs to transition from boundary lubrication to mixed lubrication, which eventually leads to a loss of accuracy in mechanical parts. it is necessary to explore new technologies that are more suitable for EHL
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