THE BEHAVIOR OF TRACTION FORCE AT ELLIPTIC CONTACT BETWEEN WHEEL AND RAIL (SOME EXPERIMENTAL RESULTS WITH A SPECIAL ROLLING CONTACT TESTING MACHINE UNDER WATER LUBRICATION)

So far we have treated the wheel/rail contact problems as a two-dimensional contact and studied the behavior of traction force under various surface conditions. In order to investigate the influence of lateral slip or traction on the longitudinal traction, we made some experiments of elliptic contact under water lubrication. The longitudinal traction force and slip were measured applying a force perpendicular to the rolling direction with a special rolling contact testing machine. The relation between traction coefficient and slip ratio obtained through experiments was compared with the results of our numerical analysis which used the Boundary Element Method. It was recognized that under water lubrication the experimental results approached the numerical ones accordingly as the rolling speed decreased, which was the same tendency shown by our former line contact experiments and two-dimensional analysis. When the force perpendicular to rolling direction increased, the maximum traction coefficient decreased. It could be explained through the numerical analysis that the decrease of longitudinal traction due to lateral force was attributable to the increase of slip region in contact surface.

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  • Corporate Authors:

    Railway Technical Research Institute

    2-8-38, Hikari-cho, Kokubunji-shi
    Tokyo 185,   Japan 
  • Authors:
    • Obara, T
    • Ohyama, T
    • Kakoi, K
  • Publication Date: 1995-9

Language

  • English

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Filing Info

  • Accession Number: 00715169
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 4 1996 12:00AM