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There have been many reports of wear and rail damage caused by wheel/rail contact on conventional railway lines in Japan. In particular, rail squats have been commonly reported and gauge corner cracking has been frequently observed on curved high rails with a radius of curvature of approximately 800 m. These forms of damage lead to rail breakage as the cracks develop with the repeated passage of railway vehicles. Predicting crack growth and developing countermeasures is therefore essential for establishing management methods. Furthermore, it is important to reduce the rate of occurrence of these cracks because it is difficult to remove the cracks once they occur. As a countermeasure against rail squats, in addition to the development of a rail grinding method to remove fatigue layers and small cracks on the rail surface, bainitic rails have been developed that promote self-removal of fatigue layers and small cracks by accelerating wear development. However, the advancement of gauge corner cracking is more complicated; for example, gauge corner cracking continuously combines with head checks. At present, countermeasures have not been taken in order to suppress the formation of gauge corner cracking, and there is an urgent need to propose an effective method for doing so. In the present study, countermeasures to reduce gauge corner cracking are proposed by changing the cross-sectional profile of the high rail and reducing the wheel/rail contact pressure and the effectiveness of this method is examined. A mathematical model is constructed from the viewpoint of multi-body dynamics, and the wheel/rail contact pressure at the location at which gauge corner cracking occurs is examined.
contact pressure, creepage, gauge corner cracking, multi-body dynamics, profile prediction, rail damage, wear, wheel/rail contact
[1] Magel, E.E., Sawley, K.J., Sroba, P.S. & Kalousek, J., A practical approach to controlling rolling contact fatigue in railways. 8th International Heavy Haul Conference, pp. 447– 455, 2005.
[2] Grassie, S.L., Rolling contact fatigue on the British railway system: treatment. WEAR, 258, pp. 1310–1318, 2005.
[3] Kanematsu, Y. & Matsui, M., Development and evaluation of the rail steel grade for damage restraint to the high rail in curve sections. 10th International Conference on Contact Mechanics, 58(1), 2017.
[4] Yoshioka, A., Terumichi, Y., Tsujie, M. & Matsui, J., Study on modeling and numerical analysis for the prediction of wheel wear development. Mechanical Engineering Journal, 4(4), pp. 1–11, 2017.
[5] Chen, H., Ishida, M., Namura, A., Beak, K.-S., Nakahara, T., Leban, B. & Pau, M., Estimation of wheel/rail adhesion coefficient under wet condition with measured boundary friction coefficient and real contact area. Wear, 271, pp. 32–39, 2011.
[6] Johnson, K.L., Contact Mechanics, Cambridge University Press, 1985.
[7] Kalker, J.J., Three-Dimensional Elastic Bodies in Rolling Contact, Kluwer Academic Publishers, 1990.
[8] Shabana, A.A. Zaazaa, K.E., & Sugiyama, H. Railroad Vehicle Dynamics: A Computational Approach, CRC Press, 2008.
[9] Kalousek, J. & Bethune, A.E., Rail wear under heavy traffic conditions. ASTM STP644, pp. 63–79, 1978.
[10] Ward, A., Lewis, R. & Dwyer-Joyce, R.S., Incorporating a railway wheel wear model into multi-body simulations of wheelset dynamics. Tribological Research and Design for Engineering Systems, pp. 367–376, 2003.
[11] Elkins, J.A. & Eickoff, B.M., Advances in non-linear wheel/rail force prediction methods and their validation. ASME Winter Annual Meeting, 1979.
[12] Archard, J.F., Contact and rubbing of flat surfaces. Journal of Applied Physics, 24, pp. 981–988, 1953.