Multiscale elasticplasto-hydrodynamic lubrication in line contacts involving thermal deformation and adsorbed layer
摘要
The multiscale analysis is presented for the elasticplasto-hydrodynamic lubrication in the rolling and sliding macroscale elastoplastic steel line contacts involving the surface thermal deformation in the condition of heavy loads and high rolling speeds by incorporating the effect of the physically adsorbed molecule layer on the contact surface. The calculation results show that even for a small slide-roll ratio, the severe frictional heating and the consequently resulting contact thermal deformation can cause the very low lubricating film thickness which is on the same scale with the adsorbed molecule layer thickness, in combination with the effect of the contact elastoplastic or fully plastic deformations. The stronger interaction between the fluid and the contact surface results in both the thicker adsorbed layer thickness and the higher lubricating film thickness in the contact for a given operating condition when the surface separation is reduced to be comparable to the adsorbed layer thickness at sufficiently big slide-roll ratios. The increase of the slide-roll ratio (S) drastically reduces the lubricating film thickness if