Track Modulus Analysis of Railway Track System Using Finite Element Model

2010 ◽  
Vol 16 (10) ◽  
pp. 1559-1574 ◽  
Author(s):  
K. Ganesh Babu ◽  
C. Sujatha
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Railway Track ◽  
Modulus Analysis ◽  
Track System ◽  
Track Modulus

Finite Element Analysis of a Fishplate Rail Joint in Extreme Environment Condition

2020 ◽  
Vol 12 (5) ◽  
Author(s):  
Sunil Kumar Sharma ◽  
Jaesun Lee
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Extreme Environment ◽  
High Rate ◽  
Railway Track ◽  
Element Analysis ◽  
Track System ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Railways are very efficient mode of transportation. Speed limits of the railways and loads they carry are increasing rapidly. Due to some advantages, the insulated rail joints are still the part of a rail-track system. However, a high rate of failure of joints puts the railway track at risk. Therefore, a detailed study of these joints is required. In this paper, a three-dimensional finite element model of rail-fishplate joint is created using Abaqus - a finite element method-based software. Stresses in fishplate and bolts due to wheel impact are analysed by coupling implicit and explicit methods. It is found that bolts are a critical part of a joint due to stresses and vibrations to which they are subjected. The large number of stresses and vibration can result into loosening of bolts.

NONLINEAR TRANSIENT ANALYSIS OF A RAILWAY CONCRETE SLEEPER IN A TRACK SYSTEM

2008 ◽  
Vol 08 (03) ◽  
pp. 505-520 ◽  
Author(s):  
SAKDIRAT KAEWUNRUEN ◽  
ALEX M. REMENNIKOV
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Bending Moment ◽  
Element Model ◽  
Beam Elements ◽  
Finite Element Software ◽  
Track System ◽  
Wide Range ◽  
Nonlinear Transient ◽  
Dynamic Magnification Factor

Railway sleepers in a track system are usually subjected to a wide range of loading conditions. A critical type of loading condition that causes cracking in the railway concrete sleepers is the dynamic transient wheel force. The transient wheel forces are often due to wheel or rail abnormalities. This paper presents a dynamic finite element model of a railway concrete sleeper in a track system, aimed at raising the consideration of dynamic effects in sleeper design. The railway concrete sleeper is modeled using the beam-on-elastic-foundation theory. Since in the actual tracks the ballast underneath does not provide any tensile resistance, the finite beam elements employed in this investigation take into account the bending and shear deformations, together with the tensionless nature of the elastic support. This paper places emphasis on the effect of the transient periods on the flexural responses of railway sleepers in track systems. Using the robust finite element software STRAND7, the finite element model of the railway concrete sleeper was previously established and validated against experimental data by the authors. The numerical analyses present the ratio between the dynamic and the static bending moment resultants, the dynamic magnification factor, of the railway concrete sleeper under different sinusoidal pulse durations.

scholarly journals Friction-Induced Vibration of a Railway Wheelset-Track System and Its Effect on Rail Corrugation

Lubricants ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 18
Author(s):  
Guangxiong Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
The Self ◽  
3D Finite Element ◽  
Rail Corrugation ◽  
Track System ◽  
Excited Vibration ◽  
Creep Force ◽  
Friction Induced Vibration

In the present study, the effect of the radius of railway curved tracks on the slip of a wheel on a rail is studied. A 3D finite-element model of a wheelset-track system is established when the creep force between the wheel and rail is saturated. The occurrence propensity of the self-excited vibration of the wheelset-track system is predicted. It is concluded that the radius of curved tracks has a strong effect on the slip of wheels on rails. In the tightly curved tracks, the slip of the wheel of the leading wheelset on the rail always occurs. The wheelset-track system has a strong occurrence propensity for unstable vibrations on the tightly curved tracks. The accuracy of the rail corrugation prediction based on the unstable vibrations of wheelset-track systems is determined to be 85–90% or higher.

A Finite Element Model of Railway Track and its Application to the Wheel Flat Problem

1994 ◽  
Vol 208 (1) ◽  
pp. 61-72 ◽  
Author(s):  
R G Dong ◽  
S Sankar ◽  
R V Dukkipati
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Railway Track ◽  
Railway Vehicle ◽  
Impact Loads ◽  
Vehicle Speed ◽  
Lift Off ◽  
Wheel Flat ◽  
The Impact

To study the dynamic interactions between the railway vehicle and track, a finite element model of infinitely long track is developed. The track is represented by a Timoshenko beam on discrete pad-tie-ballast supports. The non-linear factors such as loss of wheel-rail contact, rail lift-off from the tie and tie lift-off from the ballast are taken into account. A multi-point wheel-rail contact model is also proposed. The dynamic forces on the track and the strains on the rail are directly calculated from the model. The vehicle could travel on the track forever with an arbitrary time-dependent speed. The steady-state response of a vehicle-track system for a perfect wheel carrying a constant load and travelling at a constant speed over a track with no irregularities is studied using the finite element model and is presented. The impact loads due to wheel flats are also studied with this model. The results show a good correlation with the experimental data available in the literature. Influences of system parameters on the impact loads due to a wheel flat are also investigated. T***he results show that the axle load and vehicle speed are the important factors affecting the wheel-rail impact loads. The impact forces transferred from the rail to the tie are strongly affected by the pad stiffness and tie mass.

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