A three dimensional finite element analysis of insulated rail joints deterioration

El–sayed, H.M.; Lotfy, Mohamed; Zohny, Haytham N.; Riad, H.S.

doi:10.1016/j.engfailanal.2018.04.042

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…However, in the actual numerical calculation, the points in the model space exceed the computational limit. In this case, the finite element mesh generation method [ 24 , 36 ] is used in the numerical calculation to convert infinite points into finite points, and then each node after grid planning is calculated.…”

Section: Three-dimensional Meshing Mathematical Modelmentioning

confidence: 99%

“…In this paper, changes in the induced magnetic field, the eddy current, and the rail temperature during the eddy current normalizing heat treatment of the U75V rail are studied. The finite element numerical simulation method [ 24 , 25 ] is used for numerical simulation of the eddy current heat treatment process of the rail. The finite element differential equation in the mesh division is also established by taking into account the Maxwell equation [ 26 , 27 ] in electromagnetic theory and the Fourier heat transfer law [ 28 , 29 ] in the heat transfer theory.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Eddy Current Welding of Rail: Three-Dimensional Simulation

Sun

Liu

Song

et al. 2020

Entropy

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In this paper is given a three-dimensional numerical simulation of the eddy current welding of rails where the longitudinal two directions are not ignored. In fact, usually it is considered a model where, in the two-dimensional numerical simulation of rail heat treatment, the longitudinal directions are ignored for the magnetic induction strength and temperature, and only the axial calculation is performed. Therefore, we propose the electromagnetic-thermal coupled three-dimensional model of eddy current welding. The induced eddy current heat is obtained by adding the z-axis spatial angle to the two-dimensional electromagnetic-thermal, thus obtaining some new results by coupling the numerical simulation and computations of the electric field and magnetic induction intensity of the three-dimensional model. Moreover, we have considered the objective function into a weak formulation. The three-dimensional model is then meshed by the finite element method. The electromagnetic-thermal coupling has been numerically computed, and the parametric dependence to the eddy current heating process has been fully studied. Through the numerical simulation with different current densities, frequencies, and distances, the most suitable heat treatment process of U75V rail is obtained.

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Section: Three-dimensional Meshing Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Eddy Current Welding of Rail: Three-Dimensional Simulation

Sun

Liu

Song

et al. 2020

Entropy

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“…In these publications the authors stated the most appropriate type of endpost elements to be applied in fishplated rail joints,  modified geometry in the head of rail section (longitudinal section, i.e. arch shape) is able to provide lower arising stresses and expand the life-time of fishplated rail joints [12],  lipping phenomena in the rail head near the endpost is able to be set back by better rail steel grade or altered-treated steel types applied in rail head [5] [13] [14],  external reinforcement methodologies can provide increased bending stiffness of rail joints assembled with fishplates [1],  the application of non-perpendicular (i.e. for example 30° and 45°, in other words: inclined) rail joints is able to reduce vertical deformation, noise and vibration compared to normal ones (i.e.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…for example 30° and 45°, in other words: inclined) rail joints is able to reduce vertical deformation, noise and vibration compared to normal ones (i.e. perpendicular joint types) [12],…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

Major

Fischer

2020

Acta Tech. Jaurinensis

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In this paper the authors detail the possibilities of modelling of finite element method (FEM) of glued insulated rail joints which are applied in railway tracks with continuously welded rails (CWR). A lot of laboratory tests (static and dynamic 3-point bending tests, axial pulling tests) were executed on glued insulated rail joints, the specimens were related to three different rail profiles applied in Hungary: MÁV 48.5; 54E1 (UIC54), 60E1 (UIC60), respectively. The static bending tests with many bay length values were conducted, before and after dynamic (fatigue) tests. 2-D beam models were made in FEM software using semi-rigid hinge as the simplified connection of fishplated glued insulated rail joint. The FEM models were calibrated and then validated with the static vertical displacement values in the middle-bay position measured in laboratory. The model validation was conducted with two methods.

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“…Unfortunately, insulated rail joints and switch with gaps cause stiffness discontinuity and stress singularity in rail sections, which significantly increases the contact force and causes harmful vibrations of the vehicle and the track system [15]. ere is a problem that the rolling contact behavior between wheels and rails in the switch panel is different from that in the tangent track rail system due to the discontinuity of rails.…”

Section: Introductionmentioning

confidence: 99%

A Design Method for Rail Profiles in Switch Panel of Turnout Based on the Contact Stress Analysis

Chen

Shen

Mao

et al. 2020

Shock and Vibration

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Contact stress between wheel and rail is believed to cause damage to the rail. The relationship between the contact stress and the radius of the rail is initially based on the Hertz contact theory. By adjusting its radius, the rail profile is designed with an objective of reducing the maximal contact stress between wheel and rail. The rail profile of turnout is parameterized by defining several control cross sections along the switch. The experiment of dynamic vehicle-turnout interaction is also carried out to investigate the effect of the improved rail profile on the dynamical behavior of the vehicle. The method is then verified through examples using rail profile with a switch width of 20 mm and LM worn-type tread at the CN60-350-1:12 turnout. The results show that the designed rail has a higher matching degree with the wheel profile. It can reduce the contact stress, improve the wheel-rail contact state, and prolong the service life of the rail without deteriorating the dynamic performance of the vehicle passing through the turnout.

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A three dimensional finite element analysis of insulated rail joints deterioration

Cited by 18 publications

References 25 publications

Modeling of Eddy Current Welding of Rail: Three-Dimensional Simulation

Modeling of Eddy Current Welding of Rail: Three-Dimensional Simulation

FEM Modelling Possibilities of Glued Insulated Rail Joints for CWR Tracks

A Design Method for Rail Profiles in Switch Panel of Turnout Based on the Contact Stress Analysis

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