Laboratory investigation of ability of oil-based friction modifiers to control adhesion at wheel-rail interface

Abstract In the last few years, top-of-rail friction modifiers have been designed and used in many railway systems all over the world. These adhesion enhancers are applied by either off-board or on-board system in order to achieve the intermediate level of friction and positive adhesion curve. Previous scientific effort was mainly focused on the effects of water-based friction modifier on adhesion, rolling contact fatigue, railway noise and corrugation formation. The objective of this study is to investigate the abilities of oil-based friction modifiers to control adhesion and reduce wear at wheel rail interface. For this purpose, two commercial oil-based friction modifiers were particularly utilised. A ball-on-disc tribometer was employed to investigate their traction and braking performance for various slip ratios under dry conditions. Furthermore, the effect of friction modifier amount has been studied. At the end of the performed tests, wear rate, surface damage and changes of surface topography were determined and compared to dry and oil-contaminated contact. The results indicate that oil-based friction modifiers are able to control adhesion in wheel-rail contact but it is strongly dependent on the applied amount of friction modifiers. Regarding to the friction behaviour and wear, the content of metal particles seems to be the crucial parameter.

[1]  Joe Kalousek,et al.  The role of high positive friction (HPF) modifier in the control of short pitch corrugations and related phenomena , 2002 .

[2]  N. Gil-Negrete,et al.  Effect of liquid high positive friction (HPF) modifier on wheel-rail contact and rail corrugation , 2005 .

[3]  R Lewis,et al.  Wear at the wheel/rail interface when sanding is used to increase adhesion , 2006 .

[4]  Ulf Olofsson,et al.  Influence of leaf, humidity and applied lubrication on friction in the wheel-rail contact: Pin-on-disc experiments , 2004 .

[5]  J. Kalousek,et al.  Rheological model of solid layer in rolling contact , 1997 .

[6]  Donald T. Eadie,et al.  Top-of-rail friction control for curve noise mitigation and corrugation rate reduction , 2006 .

[7]  Makoto Ishida,et al.  Experimental investigation of influential factors on adhesion between wheel and rail under wet conditions , 2008 .

[8]  R. Stock,et al.  The effects of top of rail friction modifier on wear and rolling contact fatigue : Full-scale rail-wheel test rig evaluation, analysis and modelling , 2008 .

[9]  E. A. Gallardo-Hernández,et al.  Rolling–Sliding Laboratory Tests of Friction Modifiers in Leaf Contaminated Wheel–Rail Contacts , 2008 .

[10]  M. Ishida,et al.  Relationship between surface oxide layer and transient traction characteristics for two steel rollers under unlubricated and water lubricated conditions , 2011 .

[11]  Donald T. Eadie,et al.  Influencing rolling contact fatigue through top of rail friction modifier application – A full scale wheel–rail test rig study , 2011 .

[12]  Zili Li,et al.  A laboratory investigation on the influence of the particle size and slip during sanding on the adhesion and wear in the wheel–rail contact , 2011 .

[13]  Minhao Zhu,et al.  The effect of alumina particle on improving adhesion and wear damage of wheel/rail under wet conditions , 2016 .

[14]  Ulf Olofsson,et al.  Investigation of factors influencing wheel–rail adhesion using a mini-traction machine , 2012 .

[15]  Philippa Cann,et al.  The “leaves on the line” problem—a study of leaf residue film formation and lubricity under laboratory test conditions , 2006 .

[16]  J. Casselgren,et al.  Measurements of friction coefficients between rails lubricated with a friction modifier and the wheels of an IORE locomotive during real working conditions , 2015 .

[17]  Joe Kalousek,et al.  Railway noise and the effect of top of rail liquid friction modifiers: changes in sound and vibration spectral distributions in curves , 2005 .

[18]  Martin Hartl,et al.  Influence of sanding parameters on adhesion recovery in contaminated wheel–rail contact , 2015 .

[19]  Minhao Zhu,et al.  Influence of friction modifiers on improving adhesion and surface damage of wheel/rail under low adhesion conditions , 2014 .

[20]  U. Olofsson,et al.  Effect of humidity, temperature and railhead contamination on the performance of friction modifiers: Pin-on-disk study , 2013 .

[21]  Zili Li,et al.  Rolling–sliding laboratory tests of friction modifiers in dry and wet wheel–rail contacts , 2010 .

[22]  Numerical and experimental investigation on adhesion characteristic of wheel/rail under the third body condition , 2016 .

[23]  Yasuhiro Sato,et al.  Creep force characteristics between rail and wheel on scaled model , 2002 .

[24]  Qi-yue Liu,et al.  Effects of rail materials and axle loads on the wear behavior of wheel/rail steels , 2016 .

[25]  T. M. Beagley,et al.  Wheel/rail adhesion — the overriding influence of water , 1975 .

[26]  Donald T. Eadie,et al.  Laboratory study of the tribological properties of friction modifier thin films for friction control at the wheel/rail interface , 2005 .

[27]  Paul A. Meehan,et al.  Investigation of squeal noise under positive friction characteristics condition provided by friction modifiers , 2016 .

[28]  I. McEwen,et al.  Wheel/rail adhesion — the influence of railhead debris , 1975 .

[29]  Tsunamitsu Nakahara,et al.  An experimental investigation of transient traction characteristics in rolling–sliding wheel/rail contacts under dry–wet conditions , 2007 .

[30]  O. Arias-Cuevas,et al.  Investigating the Lubricity and Electrical Insulation Caused by Sanding in Dry Wheel–Rail Contacts , 2010 .

[31]  J. Song,et al.  Experimental study on adhesion behavior of wheel/rail under dry and water conditions , 2011 .

[32]  I. J. McEwen,et al.  WHEEL/RAIL ADHESION-BOUNDARY LUBRICATION BY OILY FLUIDS , 1975 .