Characterization of Friction and Wear Behavior of Friction Modifiers used in Wheel-Rail Contacts
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Abstract
Reliable traction between wheel and rail is an important issue in the railway industry. To reduce variations in the coefficient of friction, so-called “friction modifiers” (carrier with particles) are used. Twin-disk tests were done with three commercial friction modifiers, based on different compositions of carrier and particles, to characterize their friction and wear behavior. It is shown experimentally that the influence of the carrier cannot be neglected just after application and very low (0.01-0.05) frictional values are observed in a fully flooded situation. However, starvation occurs quickly and friction values will become relatively stable at an intermediate level around μ=0.2 until the friction modifier is consumed and a new dose is required. After the carrier is pushed out of the running track the particles in the contact dominate the tribological performance. The level of friction is a function of total rolling distance, effective sliding length and sum velocity. The most dominant factor depends on the friction modifier and the working mechanism for friction stabilization. It is also shown that the wear rates during tests do not depend significantly on slip, which makes it possible to predict wear behavior. Wear rates are dependent on the type of friction modifier used.
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wear prediction, wear, friction, solid particles, abrasion, friction modifier, slip
Arias-Cuevas, O., Li, Z., Lewis, R., & Gallardo-Hernández, E. A. (2010). Rolling–sliding laboratory tests of friction modifiers in dry and wet wheel–rail contacts. Wear, 268(3–4), 543-551. doi:http://dx.doi.org/10.1016/j.wear.2009.09.015
Beagley, T., & Pritchard, C. (1975). Wheel/rail adhesion—the overriding influence of water. Wear, 35(2), 299-313.
Chiddick, K. S. (1994). Friction modifiers: Google Patents.
Cotter, J. (2004). US Patent 6,759,372.
DeBlase, F. J., Madabusi, V. K., Ferrarotti, S., Gaenzler, F., Migdal, C. A., & Mulqueen, G. (2013). Friction Modifier Composition for Lubricants: US Patent App. 13/780,511.
Dhoke, R. (2013). Evaluation of Different Lubricants for Reduction of Rail-Wheel Noise and Wear. Paper presented at the International Conference on Technology and Business Management March.
Eadie, D. T., Santoro, M., & Powell, W. (2003). Local control of noise and vibration with KELTRACK™ friction modifier and Protector® trackside application: an integrated solution. Journal of sound and vibration, 267(3), 761-772.
Fang, L., Kong, X., Su, J., & Zhou, Q. (1993). Movement patterns of abrasive particles in three-body abrasion. Wear, 162, 782-789.
Galas, R., Omasta, M., Krupka, I., & Hartl, M. (2016). Laboratory investigation of ability of oil-based friction modifiers to control adhesion at wheel-rail interface. Wear.
Gallardo-Hernandez, E., & Lewis, R. (2008). Twin disc assessment of wheel/rail adhesion. Wear, 265(9), 1309-1316.
Godet, M. (1984). The third-body approach: a mechanical view of wear. Wear, 100(1), 437-452.
Hardwick, C., Lewis, R., & Eadie, D. (2014). Wheel and rail wear—Understanding the effects of water and grease. Wear, 314(1), 198-204.
Iwnicki, S. (2006). Handbook of railway vehicle dynamics: CRC press.
Johnson, K., Greenwood, J., & Poon, S. (1972). A simple theory of asperity contact in elastohydro-dynamic lubrication. Wear, 19(1), 91-108.
Lewis, R., & Dwyer-Joyce, R. (2004). Wear mechanisms and transitions in railway wheel steels. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 218(6), 467-478.
Li, Z., & Arias Cuevas, O. (2009). An investigation on the desired properties of friction modifiers for slippery rails. Paper presented at the STECH'09, International Symposium on Speed-up, Safety and Service Technology for Railway and Maglev Systems 2009, Niigata, Japan, June 6-June 19.
Lu, X., Cotter, J., & Eadie, D. (2005). Laboratory study of the tribological properties of friction modifier thin films for friction control at the wheel/rail interface. Wear, 259(7), 1262-1269.
Olofsson, U., Zhu, Y., Abbasi, S., Lewis, R., & Lewis, S. (2013). Tribology of the wheel–rail contact–aspects of wear, particle emission and adhesion. Vehicle System Dynamics, 51(7), 1091-1120.
Popovici, R. I. (2010). Friction in wheel-rail contacts: University of Twente.
Sin, H., Saka, N., & Suh, N. (1979). Abrasive wear mechanisms and the grit size effect. Wear, 55(1), 163-190.
Suda, Y., Iwasa, T., Komine, H., Tomeoka, M., Nakazawa, H., Matsumoto, K., . . . Kishimoto, Y. (2005). Development of onboard friction control. Wear, 258(7), 1109-1114.
T. Ferreira, W., Rasband. (2012). ImageJ User Guide.
Van Zoelen, M., Venner, C., & Lugt, P. (2009). Prediction of film thickness decay in starved elasto-hydrodynamically lubricated contacts using a thin layer flow model. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 223(3), 541-552.