Analysis of the elasto-hydrodynamic lubrication in coated finite length line contacts

S. S. Alakhramsing, M. B. De Rooij, D. J. Schipper, M. Van Drogen

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    Abstract

    Due to the finite lengths of components, such as cam-roller followers pairs, rolling element bearings, gear teeth etc., high stresses are typically generated towards the extremities of the contact, often referred to as edge loading. Therefore axial surface profiling of the components is often utilized to minimize edge loading.
    Depending on the type of surface profiling, the pressure and film thickness distribution may deviate significantly from that predicted using the infinitely long line contact assumption, i.e. the film shapes near the extremities are very different from those at the central plane. In fact. the absolute minimum film thickness and maximum pressure, which are crucial design parameters, always occur near the position where axial surface profiling starts. This has also been proven both experimentally and theoretically by a number of researchers [1] [2] [3] [4].
    Further, nowadays there is an increasing trend in the use of surface coatings in lubricated contacts. It has been observed from past studies (see for instance [5], [6] and [7] ) that the use of surface coatings can significantly enhance lubrication performance if the stiffness and thickness of the coating is designed properly. However, past studies concerning lubricated coated contacts, are mostly limited to infinite line contacts and circular contacts with and without coatings. Therefore, in this work a finite element method (FEM)-based finite line contact EHL model is developed, that includes the possibility of having a coating on both surfaces.
    As case study, the lubricated conjunction of an axially surface profiled coated roller on a coated plate is analyzed. The analysis is simplified by assuming that the two substrates and coatings are made of the same material, i.e. the coating and the bulk material of both surfaces have the Young’s moduli and Poisson’s ratios, although the coating can have different properties than the substrate. Here, the influence of operating conditions such as lubricant entrainment speed, load, lubricant properties, axial surface parameters nd coating material properties on the film thickness are analyzed.
    Original languageEnglish
    Pages1-3
    Publication statusPublished - 2017
    Event72nd STLE Annual Meeting and Exhibition 2017 - Atlanta, United States
    Duration: 21 May 201725 May 2017
    Conference number: 72

    Conference

    Conference72nd STLE Annual Meeting and Exhibition 2017
    CountryUnited States
    CityAtlanta
    Period21/05/1725/05/17

    Keywords

    • Coatings
    • Elastohydrodynamic lubrication
    • Finite line contacts

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