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Localized Boundary Effect on Elastohydrodynamic Lubricated Film Shape

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Abstract

The study aimed to determine the formation of an adsorption film at elastohydrodynamic lubricated (EHL) contacts and its effects on EHL film shape and friction. Experiments were conducted on an optical EHL test rig with surfaces of different surface energies. A new type of “abnormal” EHL film shape characterized with three dimples in the inlet of the contact was obtained in pure ball sliding experiments with long-chain polybutene. The adsorption layer was inferred to be the main cause for the “tri-dimple” phenomenon. The “tri-dimple” formation was examined. Under a fixed speed, a single inlet dimple gradually broke into three dimples with increasing number of ball rotation, and it happened with slight increase in friction force. Three zones, namely a central and two lateral zones, of the contact were classified and characterized with different levels of influence on the adsorption layer.

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Acknowledgments

The work described in the paper was funded by the Research Grants Council of Hong Kong (Project No. CityU 122710) and Natural Science Foundation of China (Project No. 51275252). The authors would like to extend their thanks to Dr. X. Zhou of SKF for preparing the EGC coating specimen.

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Authors and Affiliations

  1. College of Urban Transit, Shenzhen University, 3688 Nanhai Avenue, Shenzhen, Guangdong, China

    Z. Fu

  2. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China

    P. L. Wong

  3. School of Mechanical Engineering, Qingdao Technological University, Qingdao, Shandong, China

    F. Guo

Authors
  1. Z. Fu
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  2. P. L. Wong
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  3. F. Guo
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Correspondence to P. L. Wong.

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Fu, Z., Wong, P.L. & Guo, F. Localized Boundary Effect on Elastohydrodynamic Lubricated Film Shape. Tribol Lett 56, 471–479 (2014). https://doi.org/10.1007/s11249-014-0424-y

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  • DOI: https://doi.org/10.1007/s11249-014-0424-y

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