The wheel-rail contact is subjected to various environmental contaminations, while one of the most common is water. A numerical model has been used to evaluate friction in water-contaminated contact. The Greenwood and Tripp theory is used to calculate the load carried by asperities and liquid film. This model uses Kalker's simplified theory with an implemented third body layer to determine the frictional values of asperity contact and elastohydrodynamic theory for friction generated by liquid. The results are compared with experiments on two types of surface roughness. The results show the difference between elastic and plastic asperity deformation model, where the plastic model predicts more accurate transition in mixed lubrication regime. The plastic deformation model was used to predict traction curves.

轮轨接触受到各种环境污染，而最常见的污染之一是水。数值模型已用于评估水污染接触中的摩擦。Greenwood和Tripp理论用于计算凹凸不平和液膜所承受的载荷。该模型使用Kalker的简化理论和已实现的第三体层来确定粗糙接触的摩擦值，并使用弹性流体力学理论来确定液体产生的摩擦。将结果与两种表面粗糙度的实验进行了比较。结果表明，弹性和塑性粗糙变形模型之间存在差异，其中塑性模型预测混合润滑状态下的过渡更为准确。塑性变形模型用于预测牵引曲线。