Abstract
Heat-strengthened rails of the R65 type are the main type of rails used on the railway network of Russian Railways. Reducing the number of cropped and acutely defective rails is possible due to the rational use of the design features of intermediate rail fasteners and their current content.The article presents study results of the stiffness influence of intermediate fasteners on the operational durability of rails. The general statistics of the use of various types of intermediate rail fastenings on the network of Russian railways is considered. The main results of previously published studies on the effect of the stiffness of intermediate rail fasteners on the accumulation of contact fatigue damage in rails are briefly presented.Calculations of the accumulation of contact-fatigue damages in rails, carried out by the authors, are based on the data on the vertical and horizontal transverse stiffness of intermediate rail fastenings obtained from the results of bench tests. Calculations of the accumulation of contact-fatigue damage were carried out using the “Universal Mechanism” software package. In the process of modeling, four types of intermediate rail fasteners were considered: ARS-4, ZhBR-65Sh, ZhBR-65PShM and W-30. Calculation results were obtained for a curve with a radius of 650 m on a continuous welded track section.
Highlights
Heat-strengthened rails of the R65 type are the main type of rails used on the railway network of Russian Railways
Russian Open Academy of Transport (ROAT) of the Federal State Autonomous Educational Institution of Higher Education “Russian University of Transport” (FGAOU VO “RUT” (MIIT)), Moscow, 125315, Russia 2 Joint Stock Company Railway Research Institute (JSC “VNIIZHT”), Moscow, 129626, Russia
Summary
4. Удельный выход рельсов на скреплениях различных конструкций: а — КБ-65: — Восточный полигон; — Западный полигон; б – АРС-4: — Восточный полигон; — Западный полигон; в — ЖБР-65Ш: — Восточный полигон; — Западный полигон; г – ЖБР-65 ПШМ (П, ПШ, ПШР): — Восточный полигон;. — Western polygon; д — W-30: — Western polygon; е – PFK-350: — Western polygon повреждений для скреплений АРС-4 демонстрировали гораздо более интенсивный рост, чем для других скреп лений Такой результат может свидетельствовать о наличии рисков роста контактно-усталостных повреждений в рельсах с такими скреплениями, лежащих в кривых радиусом 650 м и менее, на грузовых линиях, после пропуска тоннажа 100 млн т брутто. 6 видно, что накопление повреждений рельсов в кривых радиусом 650 м после пропуска 100 млн т брутто начинается позже всего на скреплениях W-30.
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