Effects of Rail Cant on Wheel-Rail Contact Forces in Slab Tracks

Zakeri, Jabbar Ali; Fathali, Masoud; Roudsari, Nima Boloukian

doi:10.5923/j.mechanics.20110101.02

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…Cant variations of the rails diverging from the parameters specified, can lead to a more accelerated degradation of the components of the permanent way and among other losses to the railways (Sadeghi et al, 2009). Arema suggested the rail cant 1/40, however, this value is not a consensus, in Iranian railways, most European railway, in Russian railway and Canadian railways the cant is 1/20, in German railway the rail cant is 1/40 and in Union Pacific railway the cant is 1/30 (Zakeri et al 2011). Some studies show the importance of the cant of the rails in the railways, both in relation to changes of the wheel-rail contact and in relation to the dynamic interaction (Ovchinnikov et al, 2021;Sadeghi et al, 2009;Shevtsov, 2008;Wang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effect of rail cant on stress distribution

Tiago Tepedino,

Marcelo Leite Ribeiro,

Gustavo Tressia

2023

World J. Adv. Eng. Technol. Sci.

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The rail cant is an important geometry parameter and is commonly monitored to ensure railway safety and comfort conditions. Understanding the influence of cant variation on the performance of railway components is extremely important to define the tolerance limits of the track and adequacy of maintenance plans. There are numerous rail cant patterns on railways, 1:40, 1:30, 1:20. However, the optimal rail cant to reduce the stress and wear of rail head not been extensively studied. This work performs an analysis of the effect of the rail cant on the rail head stress distribution. To investigate stress and strain in rail head, a Finite Element Model with Ansys software was used. For the analysis was considered a 136RE rail, axle load of 32 ton and AAR-1B wheel profile. The rail cant was varied in 0, 1:20 and 1:40. The results show that the stress in rail and wheel increases with the rail cant. The maximum stress occurred in the condition with rail cant of 1:20. The variation of cant from 0 to 1:20 results in a decrease of approximately 9% in maximum stress, ranging from 947 MPa to 867 MPa. The wheel/rail contact in cant zero condition occurred close to the transition of the wheel tread and the beginning of flange root, resulting in a dynamic instability in the wheelset. In addition to higher contact stress, increases the propensity for the hutting phenomenon, which can accelerate rail and wheel wear

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Section: Introductionmentioning

confidence: 99%

“…One of the variables for the development of the optimized rail profile is the cant (Shevtsov, 2008). The rail cant is the angle resulting from the rotation around its longitudinal axis towards to the inner direction of the rail (Zakeri et al 2011). This approach is currently used by all the main railways.…”

Section: Introductionmentioning

confidence: 99%

Effect of rail cant on stress distribution

Tiago Tepedino,

Marcelo Leite Ribeiro,

Gustavo Tressia

2023

World J. Adv. Eng. Technol. Sci.

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“…Today, a range of advanced simulation models have been developed, cf. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The development has mainly concerned design methodologies and analyses of application scenarios.…”

Section: Introductionmentioning

confidence: 99%

Innovative requirements and evaluation methods for slab track design

Aggestam,

Ekberg,

Nielsen

2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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With increasing train speeds and reduced time windows for maintenance work, the interest in the application of slab track technology to increase the capacity of high-speed railways has grown. Slab track may still be considered a relatively young technology, but with several different designs available on the market. Current research on slab tracks commonly focuses on improved methods. In contrast, the formulation of requirements, and evaluation towards these, are seldom investigated. In this paper, state-of-the-art simulation models are employed to illustrate and address the needs for innovative requirements in terms of structural integrity and robustness, life cycle cost (LCC) and environmental footprint of new and existing slab track designs. Based on demonstration examples, it is argued that current standards may lead to overly conservative designs inducing higher LCC and environmental footprint than necessary. Extensions of the standards in terms of LCC and environmental footprint are suggested. The conflict of interest between structural integrity and robustness, LCC and environmental footprint is discussed, and suggestions for how to optimise slab track structures are proposed.

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“…Küresel talep ve demiryolu ağlarının kullanımındaki artış, toplam yük/yolcu kapasitesinin artması ile aks ağırlıklarında ve tren hızlarında artışı beraberinde getirmektedir [2,3]. Bu da kaçınılmaz olarak ray bileşenlerinin ömründe azalmaya ve ray bakım maliyetlerinde artışa yol açmaktadır [4][5][6]. Artan ray tekerlek temas döngüleri, aşınma ve yorgunluk kusurlarının daha hızlı ve daha sık görülmesi ile servis ömrünün azalması tren işletilmesinde riski arttıran önemli bir faktördür [7][8][9].…”

Section: Introductionunclassified

Metalografik İncelemelerle Ray Yüzeyindeki Soyulmaların Nedeninin Araştırılması

Uğur¹,

Davut²,

Bacaci³

2020

European Journal of Science and Technology

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Railways are increasingly used for passenger and freight transportation worldwide. This increased traffic causes more quick and frequent formation of defects on train tracks. In this study, rail sets used in Bursa province, that had been reported to experience rapid wear and scaling, were examined. The rail sets were manufactured from R260 steel and the problem occurs more frequently on curves. For comparison, rail sets from straight lines were also examined. After visual examination, specimens from gauge and field corner regions were taken and prepared for metallographic examination. The microstructure of the specimens was examined under optical and scanning electron (SEM) microscopes. Moreover, Vickers micro-hardness tests were also performed. Micro-chemical analyses were performed using an energy dispersive X-ray spectroscopy (EDS) system attached to the SEM. For macro-chemical analysis, an optical emission spectrometer (OES) was used. The cross section of the rails was macro-etched for macro-examination. The results show that the microstructure of the rails is composed of 100% pearlite. On the other hand, the pearlitic structure degenerates at parts of the rail which are under loading. Due to severe plastic deformation, the pearlitic structure changes into a fiber-like structure composed of sub-micron ferrite and cementite. Those degenerated pearlitic regions have higher hardness due to strain hardening and cause crack initiation. Those cracks can then grow into inner sections of the rail easily due to the presence of non-metallic inclusions in the microstructure. Iron oxide particles were found in the vicinity of cracks; which indicate that cracks do not grow rapidly, they rather grow in time according to usage and atmospheric conditions. The examinations revealed that the wear, cracks and scaling problems were formed due to rolling contact fatigue (RCF). The presence of inclusions enhanced the growth of RCF-cracks and later cause "shelling". In order to delay or prevent this problem, using higher strength rails at critical locations such as curves, controlling and rating the non-metallic inclusions in accordance with the international standards, checking the lubrication and maintenance strategies of rails and wheels, working on optimization of rail-wheel contact characteristics are recommended. The last recommendation involves developing a sustainable model by identifying technical limitations of the line and cruise depending on vehicle characteristics.

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Effects of Rail Cant on Wheel-Rail Contact Forces in Slab Tracks

Cited by 8 publications

References 9 publications

Effect of rail cant on stress distribution

Effect of rail cant on stress distribution

Innovative requirements and evaluation methods for slab track design

Metalografik İncelemelerle Ray Yüzeyindeki Soyulmaların Nedeninin Araştırılması

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