Rolling Contact Fatigue on premium rail grades: Damage function development from field data

Hiensch, Martin; Steenbergen, Michaël

doi:10.1016/j.wear.2017.10.018

Cited by 25 publications

(14 citation statements)

References 11 publications

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“…Therefore, studying the tribological behaviour of a pair of materials under diverse contact conditions is key to understanding the transitions between different wear regimes. Hiensch and Steenbergen [1], for instance, used data from the field to show that premium R370CrHT grade rail offers better resistance to Rolling Contact Fatigue (RCF) than conventional R260Mn grade, mainly because the wear number (Tgamma) associated with fatigue crack initiation for the harder rail is higher. They note that quantitative determination of the wear and RCF behaviour of the steels in the descending part of the damage function could be found using twin-disc testing; an approach that we describe here.…”

Section: Introductionmentioning

confidence: 99%

Twin disc assessment of wear regime transitions and rolling contact fatigue in R400HT – E8 pairs

Santa

Cuervo

Christoforou

et al. 2019

Wear

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Twin disc tests were carried out to evaluate the wear resistance and Rolling Contact Fatigue (RCF) of premium R400HT rail samples in contact with E8 wheel samples. The wear rate and friction coefficient were correlated with the frictional work expended at the contact interface (the Tgamma approach). Accelerated RCF tests were also carried out on the premium R400HT rail and the results were compared to those obtained for standard R260 rail. The wear rates of rail samples were consistently lower than those reported in the literature for other contacting pairs in which the rail material studied is softer than R400HT. Also, the energy needed for the transition from the moderate to severe wear regime significantly increased for the hardened rail. Fatigue cracks were shallower for R400HT when compared with standard rail material. Hardened rails also showed lower mean spacing between fatigue cracks. This new information can be used to improve wear simulations of wheels and rails by using more realistic wear equations.

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Section: Introductionmentioning

confidence: 99%

Twin disc assessment of wear regime transitions and rolling contact fatigue in R400HT – E8 pairs

Santa

Cuervo

Christoforou

et al. 2019

Wear

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show abstract

“…The parameters that will be further explored in the sensitivity study are presented in Table 2 along with their respective intervals. The selection of these intervals (parameters ranges) is based on literature data [32][33][34][35][36] and field experience. Furthermore, the parameters related to lubrication, pollution and weather conditions are all captured by the coefficient of friction.…”

Section: Sensitivity Study Resultsmentioning

confidence: 99%

Rail wear and remaining life prediction using meta-models

Meghoe

Loendersloot

Tinga

2019

International Journal of Rail Transportation

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The study presented in this paper proposes a method to estimate the Remaining Useful Life (RUL) of railway tracks determined by wear and taking into account various track geometry and usage profile parameters. The relation between these parameters and rail wear is established by means of meta-models derived from physical models. These models are obtained with regression analysis where the best fit is found from a relatively large set of numerical experiments for various scenarios. The specific parameter settings for these scenarios are obtained by using the Latin Hypercube Sampling (LHS) method. Furthermore, for the rail profile, which is one of the input parameters for the meta-model, it is shown that the evolution due to wear in moderate curves can be characterized by only one parameter. The findings in this work including are valuable for Infrastructure Managers (IMs) and can easily be implemented in maintenance decision support tools.

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“…Tekerlekler ve raylar arasındaki yuvarlanma temasından tekrarlanan yüklerin uygulanması, malzemenin en üst katmanında ciddi plastik deformasyona [24] neden olur, bu da sonunda yorgunluk hasarı bir sınırı aştığında çatlak oluşumuna yol açar [25]. RCF ve aşınma arasında optimum çözümlerin bulunmasında ray teker malzemelerinin mikroyapı kararlılığının sağlanması çatlakların önlenmesi için önemlidir [26][27][28].…”

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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Rolling Contact Fatigue on premium rail grades: Damage function development from field data

Cited by 25 publications

References 11 publications

Twin disc assessment of wear regime transitions and rolling contact fatigue in R400HT – E8 pairs

Twin disc assessment of wear regime transitions and rolling contact fatigue in R400HT – E8 pairs

Rail wear and remaining life prediction using meta-models

Metalografik İncelemelerle Ray Yüzeyindeki Soyulmaların Nedeninin Araştırılması

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