Direct observation of surface transition during scuffing in dry condition

Kazuyuki Yagi, Naoya Ikeda, Joichi Sugimura, Seiji Kajita, Toshihide Ohmori, Takatoshi Shinyoshi, Atsushi Suzuki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)


    This study investigates surface changes during scuffing in a dry condition. In the test a ball-on-disc apparatus was used, in which a rotating sapphire disc was loaded to a stationary steel ball. The contact area was directly observed and recorded by a digital camera attached to a microscope during the test. The variations in frictional force were synchronously measured with the capturing of images of the camera. After the test, the hardness of the scuffed steel ball were measured at different points in the contact area. The direct observation of the contact area shows that areas of macro plastic flow appeared from the trailing side of the contact area with a dramatic increase in frictional force. The macro plastic flow areas were changed, resulting in a dramatic expansion of the contact area. During the dramatic expansion, the friction coefficient kept a high constant value of about 0.4. The hardness distributions of the scuffed steel ball showed that the hardness was smaller at the tailing side of the contact area, in which macro plastic flows started, than that at the leading side. On the other hand the temperature rise calculated by a simple temperature estimation model was insufficient to cause the hardness reduction.

    Original languageEnglish
    Title of host publicationASME/STLE 2012 International Joint Tribology Conference, IJTC 2012
    Number of pages3
    Publication statusPublished - Dec 1 2012
    EventASME/STLE 2012 International Joint Tribology Conference, IJTC 2012 - Denver, CO, United States
    Duration: Oct 7 2012Oct 10 2012

    Publication series

    NameAmerican Society of Mechanical Engineers, Tribology Division, TRIB


    OtherASME/STLE 2012 International Joint Tribology Conference, IJTC 2012
    Country/TerritoryUnited States
    CityDenver, CO

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Materials Science(all)


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