TRANSIENT ANALYSIS OF SURFACE-FEATURES IN AN EHL LINE CONTACT IN THE CASE OF SLIDING

This paper investigates in detail the influence of two different surfa ce topographies on the pressure distribution and film thickness profil e of a highly loaded (maximum Hertzian pressure 2 GPa) line contact as a function of the slide to roll ratio. To accomplish this the transie nt Reynolds equation is solved both in space and time. The first featu re under investigation is localized, a so-called indentation, the seco nd one is global: waviness. The observed lack of synchronism in the ex tremes of pressure and film thickness is explained theoretically by an alyzing the Reynolds equation. The minimum and average film thickness values in case of waviness are analyzed as a function of the slide to roll ratio, amplitude, and wavelength. Depending on the slide to roll ratio, the transient solutions may differ significantly from their sta tionary counterparts. In such cases, therefore, a transient analysis c annot be avoided.