地铁大坡度道岔制动工况下钢轨表面接触应力变化规律研究

目的 通过分析不同坡度条件下道岔钢轨在列车下坡制动作用时的力学行为,探讨了坡度对钢轨表面接触应力指标的影响情况,为铁路线路设计人员对线路坡度进行决策时提供参考.方法 针对地铁单开道岔尖轨跟端60AT轨,运用有限元方法对其进行数值模拟,建立地铁车轴与60AT轨的精细化模型,分析了制动力作用下不同坡度时钢轨表面各项应力指标...

Research on the Change Law of Rail Surface Contact Stress under the Braking Condition of Metro Turnout

By analyzing the mechanical behavior of the turnout rails under train braking downhill with different slopes, the influence of slope on rail surface contact stress indicators are explored, which can provide useful reference for railway line designers to make decision on railway line slopes. Aiming at the 60AT rail at the heel end of the single turnout in the subway, the finite element method is used to carry out numerical simulation to establish the refined model of the subway axle and the 60AT rail. When the slope changes from 0% to 3.0%, most of the rail stress indicators change little, only the longitudinal shear stress of the rail surface and the rail surface friction change the most, where the changes are only 8.40% and 3.18% respectively, both of which do not exceed 10%.From the perspective of rail stress analysis, slope is not a decisive factor in controlling rail damage. In order to prevent excessive local stress on the rail surface during train braking, it is recommended to perform full-length quenching treatment on the surface of the rail in this section to improve the yield strength of rails.