Daniel, Tilahun (PhD)Gutanbar, Debere2019-06-252023-11-042019-06-252023-11-042014-12http://etd.aau.edu.et/handle/123456789/18584The study of the effects of friction modifiers in wheel/rail contact is vital factor for the railway networks to examine and identify property of friction modifiers on adhesion, wear rates, etc. This work focused on the effects of sand particle sizes in wheel and rail contact. The laboratory investigations were carried out on the influence of sand particle sizes in between the wheel/rail interaction by using twin disc machine. The influence of sand was investigated by using four different sand particle size distributions to account the effect. The investigation results showed that sand with higher particle sizes yield a higher adhesion coefficient but higher wear rates and surface roughness. Adhesion coefficient value increased with the increase in slip with all sand particle size distributionsen-USWheel/Rail ContactSand-Based FrictionModifiersEffectsThesis