Abstract In the autumn, train operations in the UK are likely to be unstable due to the low adhesion coefficient between the wheel and rail, and fallen leaves on the line have been known as the main cause of this problem. In this study, the temperature effects on the adhesion coefficient as well as the bonding strength of the leaf film were investigated using a twin disc machine, to develop a potential prevention and mitigation method. The high surface temperature of the disc seemed to improve the adhesion when the leaf powder suspension was present, forming a linear relationship between the surface temperature and adhesion coefficient. The surface temperature around 240 °C could be enough to attain the required level of traction. The high temperature could decrease the bonding energy between the leaf film and rail, possibly decelerating the chemical reaction for the leaf film formation. Continuous drag braking in the autumn was proposed as a countermeasure. Two effects can be expected for this method: prevention of leaf contamination by removing the leaf residue on the wheel surface and improvement of the adhesion level by braking heat.

中文翻译：

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温度对叶膜粘附系数和粘合强度的影响：双盘研究

摘要 秋季，英国列车运行不稳定，轮轨附着系数低，线路上的落叶被认为是造成这一问题的主要原因。在这项研究中，使用双圆盘机研究了温度对粘附系数和叶膜粘合强度的影响，以开发一种潜在的预防和缓解方法。当叶粉悬浮液存在时，圆盘的高表面温度似乎提高了粘附力，形成了表面温度和粘附系数之间的线性关系。240 °C 左右的表面温度足以达到所需的牵引力水平。高温会降低叶膜与钢轨之间的结合能，可能会减慢叶膜形成的化学反应。建议在秋季连续拖曳制动作为对策。这种方法有两个效果：通过去除车轮表面上的叶子残留物来防止叶子污染，以及通过制动热提高附着力水平。