Strain Stress Model of the Rail with Crack in its Head and Estimation of its Operational Lifetime

Муравьев, В. В.; Tapkov, K. A.; Volkova, L. V.; Platunov, A. V.

doi:10.4028/www.scientific.net/msf.970.177

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The theoretical studies are usually based on the analytic Hertzian solution [12], semi-analytic FASTSIM algorithm [13,14] and the finite element (FEM) simulations. The FEM simulation of stresses in the wheel rail interaction system is presented in studies [15][16][17]. An approach for determining a critical size for RCF (Rail Contact Fatigue) initiation from rail surface defects is presented in [18].…”

Section: Figure 1 Representation Of a Rail Head Defect [8]mentioning

confidence: 99%

Extending service life of rails in the case of a rail head defect

Ovchinnikov¹,

Bondarenko²,

Kou³

et al. 2021

JCE

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Rails are subjected to the processes of wear, corrosion and contact and bending fatigue during their lifecycle. As a result of these processes, various types of damage and defects are formed in rails. The residual life of rails depends on the size, position, and orientation of defects. Maximum permissible crack-size values are calculated in this paper using the finite element method. The crack plane orientation relative to the contact surface plane is analysed. The dependence of the stress intensity factor on the crack area is established. This allows continued use of defective rails and safe operation on low-activity railways.

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Section: Figure 1 Representation Of a Rail Head Defect [8]mentioning

confidence: 99%

Extending service life of rails in the case of a rail head defect

Ovchinnikov¹,

Bondarenko²,

Kou³

et al. 2021

JCE

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“…Использование электромагнитно-акустического способа ввода и приема поперечных волн позволило с необходимой точностью измерять разницу времени прохождения волн ортогональной поляризации для акустической тензометрии с целью оценки напряженно-деформированного состояния различных изделий [11][12][13].…”

Section: Introductionunclassified

The Influence of Heat Treatment on the Propagation Velocity of Shear Waves in Steel Bars

Budrin¹

2020

Intellekt. Sist. Proizv.

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В статье обсуждаются вопросы возможности оценки изменения скорости ультразвуковой волны в прутках из стали 45 при разных видах термической обработки. Диаметр прутков 14 мм, длина рабочей части 20 см. Для структуроскопии использован электромагнитно-акустический способ ввода и приема поперечных волн осевой поляризации на основе проходного преобразователя. Измерения скорости волн проведены методом многократных отражений по сечению прутка. Термическую обработку кроме состояния поставки выполнили на 8 образцах прутков по следующим режимам: отжиг при 850 °С, нормализация при 850 °С, закалка от 850 °С в масле, отпуск при 200, 400, 450, 500, 600 °С. Представлены результаты изменения скорости поперечной волны в прутках при всех режимах термической обработки. Для повышения точности определения скорости поперечных волн измерены диаметры прутков с шагом 1 см по всей длине. Скорость поперечной волны в прутках после отжига составила 3240 м/с, а после закалки 3170 м/с. Состояние поставки и после нормализации показывает одинаковую скорость поперечной волны 3230 м/с. Полученные экспериментальные данные свидетельствуют, что отжиг увеличивает скорость распространения поперечной волны в прутке на 70 м/с относительно закалки без отпуска. С увеличением температуры отпуска наблюдается рост скорости распространения поперечной волны относительно закаленного состояния, достигающий увеличения на 65 м/c до 3235 м/с при температуре 600 °С.

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Railway Track Stress–Strain Analysis Using High-Precision Accelerometers

Avsievich

et al. 2021

Applied Sciences

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We propose a new approach for railway path diagnostics on the basis of track line stress–strain analysis using the data provided by high-precision accelerometers. This type of sensor provides sufficient accuracy with lower costs, and enables the development of a railway digital twin, according to the concept of the Internet of Things. The installation of sensors on a railway track along its entire length allows real-time monitoring of the states of the technical parameters of the railway track, and using mathematical methods to evaluate its wear on the basis of constantly received data. This paper presents an original 3D model of a railway track line and the results of its analysis using a finite element method. To test the model, we performed an analysis of the normal stresses and deformations in the elements of a railway track by simulating the impact of rolling stock on a section of a railway track with intermediate rail fastenings, ZhBR-65SH. The research results were probated and tested at the testing ground of the Kuibyshev branch of Russian Railways, the Samara track. The proposed approach makes it possible to determine the load of the track, and knowing the movement of the rail, to calculate the structural stress in the elements of the railway track, to constantly monitor the parameters of the slope and rail subsidence.

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Strain Stress Model of the Rail with Crack in its Head and Estimation of its Operational Lifetime

Cited by 3 publications

References 16 publications

Extending service life of rails in the case of a rail head defect

Extending service life of rails in the case of a rail head defect

The Influence of Heat Treatment on the Propagation Velocity of Shear Waves in Steel Bars

Railway Track Stress–Strain Analysis Using High-Precision Accelerometers

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