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International Journal of Railway Technology
IJRT, Volume 2, Issue 4, 2013
Wheel and Rail Profile Wear on Small Radius Curved Tracks and its Effect on Derailment Coefficients: Measurement and Simulation
H. Sugiyama1, M. Yada2, H. Yamamoto2, J. Kurihara3, H. Ohbayashi3, Y. Shimokawa4, M. Mizuno4 and M. Tanimoto5
1Department of Mechanical and Industrial Engineering, The University of Iowa, USA
H. Sugiyama, M. Yada, H. Yamamoto, J. Kurihara, H. Ohbayashi, Y. Shimokawa, M. Mizuno, M. Tanimoto, "Wheel and Rail Profile Wear on Small Radius Curved Tracks and its Effect on Derailment Coefficients: Measurement and Simulation", International Journal of Railway Technology, 2(4), 85-98, 2013. doi:10.4203/ijrt.2.4.5
Keywords: wheel and rail profile wear, curve negotiation, multi-Hertzian contact, derailment coefficient.
In this investigation, the wheel and rail contact problem on small radius curved tracks for severely worn profiles, and its effect on the derailment coefficient of railroad vehicles, are discussed. The on-track condition monitoring system installed on small radius curved tracks in the Tokyo subway is used to measure the wheel/rail contact forces over years. The measurement results on the curved rail that has a severely worn profile with plastic material flows around the gauge corner indicates that the derailment coefficient (L/V ratio) decreases as the wear level increases. To explain this phenomenon, the finite element contact analysis is performed first, for the measured worn wheel and rail profiles, and then the contact patches obtained by the finite element analysis are used to define the multi-Hertzian contact in the curve negotiation analysis on the small radius curved track. The numerical results indicate the same decreasing trend of the derailment coefficient as the wheel wear increases. It is demonstrated that the location of contact patches on the flange moves close to the top of the flange as the wear around the flange becomes significant, and it leads to the increase in the steering yaw moment, which explains the decreasing trend of the derailment coefficient observed in the measurement on the small radius curved track.
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