Amplitude Reduction of Waviness in Transient EHL Line Contacts

C.H. Venner, F. Couhier, A.A. Lubrecht, J.A. Greenwood

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    69 Citations (Scopus)
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    The problem of surface waviness in ElastoHydrodynamic Lubrication is commonly considered as a first step towards understanding the lubrication of rough surfaces. Both problems are generally transient. The current paper investigates the deformation of sinusoidal waviness in the contact, more precisely it studies the amplitude reduction of one-sided waviness in a transient EHL line contact. The film thickness amplitude at X = 0 is called Ad (deformed amplitude). It is shown that for waviness amplitudes smaller than the film thickness Ai <Hc, the ratio Ad/Ai is independent of the undeformed amplitude Ai. In other words: for small amplitudes the deformed amplitude depends linearly on the initial amplitude Ai. Rather surprisingly, the same behaviour is found for Ai >Hc. The results show that qualitatively waviness with short wavelengths λ/b < 1 is hardly deformed, thus Ad ≃Ai. Long wavelengths on the contrary, disappear nearly completely: Ad ≪Ai thus Ad/Ai ≃ 0. However, quantitatively the amplitude reduction was found to depend also on the contact operating conditions. With a generalized coordinate ∇, instead of λ/b, the relative amplitude Ad/Ai can be described by a single function of ∇ for all operating conditions: Ad/Ai = F(∇),∀(M, L). A possible way of expressing ∇ is:∇ = λ/bM3/4/L1/2.
    Original languageEnglish
    Title of host publicationElastohydrodynamics - '96 Fundamentals and Applications in Lubrication and Traction
    Subtitle of host publicationProceedings of the 23rd Leeds-Lyon Symposium on Tribology held in the Institute of Tribology, Department of Mechanical Engineering
    EditorsD. Dowson
    ISBN (Print)0-444-82809-5
    Publication statusPublished - 23 Feb 1997
    Event23rd Leeds-Lyon Symposium on Tribology 1996 - Leeds, United Kingdom
    Duration: 10 Sept 199613 Sept 1996
    Conference number: 23

    Publication series

    NameTribology Series


    Conference23rd Leeds-Lyon Symposium on Tribology 1996
    Country/TerritoryUnited Kingdom


    • METIS-145688


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