Computer modelling of process of accumulation of rolling contact fatigue damage in railway wheels

Sakalo, Vladimir; Sakalo, A.; Tomashevskiy, S.; Kerentcev, D.

doi:10.1016/j.ijfatigue.2018.02.002

Cited by 8 publications

(4 citation statements)

References 7 publications

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Section: Contact Fatiguementioning

confidence: 99%

“…According to these authors, their model considers microcrack initiation, coalescence, and propagation stages. Computer modeling of process of accumulation of RCF damage in railway wheels was also the subject of an investigation by Sakalo et al 24 Cracks initiated and growing under rolling-sliding contact were also the subject of a study by Daves et al 6 These authors used a two-dimensional finite-element model to evaluate the influence of contact pressure and slip on the crack driving force, crack growth rate and growth direction.…”

Section: Contact Fatiguementioning

confidence: 99%

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Experimental evaluation of the fatigue life of hydraulic gate cast iron rollers

Lashari

Polyzois

2020

Engineering Reports

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Fixed‐wheel gates with wheels mounted on both sides that roll on roller path plates are used in both emergency intake gates and spillway gates in hydrogenerating stations. Environmental corrosion along with high wheel loads cause differences in the profile of the roller path surface. Combined with the relatively high torsional stiffness of the gate end girders, a condition of wheel load redistribution occurs where some wheels are relieved of load while others are loaded beyond their maximum design values. Failure of one wheel could jeopardize the overall operation of the gate. Furthermore, frequent operation of these gates result in changes in the stress profile in both wheels and roller paths that, potentially, could lead to failure. Currently, design guidelines for gate wheels and roller paths do not consider the fatigue life of these elements. Research‐based evidence is provided to support changes to these guidelines.

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Section: Contact Fatiguementioning

confidence: 99%

Section: Contact Fatiguementioning

confidence: 99%

Experimental evaluation of the fatigue life of hydraulic gate cast iron rollers

Lashari

Polyzois

2020

Engineering Reports

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“…При этом в расчете принималось, что в каждый момент времени приращение поврежденности не зависит от накопленной поврежденности. В этом случае контактно-усталостная поврежденность, накопленная в i-м узле конечно-элементной сетки, определялась по формуле [11]:…”

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Features of the influence of intermediate rail fastenings on the operational durability of rails

Kuznetsova

Sidorova

2021

Vestnik Naučno-issledovatelʹskogo instituta železnodorožnogo tr

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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.

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“…9). Вертикальная нагрузка представлена отно- узлах трехмерной сетки определяются с применением приема наложения упругих связей на узлы, расположенные на поверхностях выделения фрагмента колеса [14]. Для позиций узла, занимаемых им при прохождении через область, прилегающую к контакту, совпадающих с узлами трехмерной сетки, определяются значения Критерий, базирующийся на max a τ , использован в модуле UM RCF (Rolling Contact Fatigue) программного комплекса «Универсальный механизм» (www.…”

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Criteria for predicting the initiation of rolling contact fatigue damage in the railway wheels and rails

Sakalo

2019

Vestnik Naučno-issledovatelʹskogo instituta železnodorožnogo tr

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The development of the methods for modeling the processes of accumulation of the rolling contact fatigue damage and wear of the wheels of the railway rolling stock and the rails is particularly relevant due to the increase in the number of damage in the recent times. The work is underway to improve the chemical composition and the technology of production of the wheel and rail steels in order to improve their mechanical properties and ability to resist the action of the cyclic loads. The methods of modeling allow predict the possibility of initiation of the fatigue cracks during operation with the sufficient accuracy in the short time. The selection of the contact fatigue criterion and the mathematical apparatus for calculating the stresses at points in the area adjacent to the contact patch to obtain the numerical values of the criterion components is the most important task in the development of modeling methods. The article focuses on the approaches based on the Dang Van criterion and the shakedown diagram for a material undergoing to the action of cyclic loads, which are widely used to assess the rolling contact fatigue of the wheels and rails. The assumptions that are used in the development of the algorithms concerning the models of the contacting bodies, the shape of the contact patch, the distribution of the contact pressures and the tangential forces are considered. The approach using the criterion — the amplitude value of the maximal shear stress is also considered. The example of modeling the process of accumulation of the rolling contact fatigue damage in the wheel of the freight car is given. The results of modeling are presented in the form of the isolines of the criterion values and the accumulated damage in the area adjacent to the contact patch. This work was supported by the Russian Foundation for Basic Research under Grant [17-01-00815A].

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Computer modelling of process of accumulation of rolling contact fatigue damage in railway wheels

Cited by 8 publications

References 7 publications

Experimental evaluation of the fatigue life of hydraulic gate cast iron rollers

Experimental evaluation of the fatigue life of hydraulic gate cast iron rollers

Features of the influence of intermediate rail fastenings on the operational durability of rails

Criteria for predicting the initiation of rolling contact fatigue damage in the railway wheels and rails

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