Time-Dependent Solutions with Waviness and Asperities in EHL Point Contacts

The effects of various surface textures, described either by an orientated waviness or an uniform distribution of asperities, are compared under pure rolling conditions for elastohydrodynamic lubricated point contacts. Time-dependent solutions, obtained with a Multigrid Multi-Integration method, reveal that the orientation of the waviness, in these conditions, has only a moderate effect on the values of minimum film thickness and maximum pressure. These results are in contrast to those obtained under pure sliding conditions, where the orientation of the surface texture leads to important differences in terms of minimum film thickness. In pure sliding, it is shown that the best lubrication condition is produced for the transverse waviness.

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