A time domain wheelflat/track FE model

Seco, M.; Sanchez, E.; Viñolas, Jordi

doi:10.1049/ic:20060057

Cited by 5 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The variation of the dynamic load on the track due to the wheel flat obtained in this numerical study was similar to that found by other authors, such as [12,38,39].…”

Section: Ballasted Tracksupporting

confidence: 91%

See 1 more Smart Citation

Wheel Flats in the Dynamic Behavior of Ballasted and Slab Railway Tracks

Vale

2021

Applied Sciences

View full text Add to dashboard Cite

Wheel flats induce high-impact loads with relevance for the safety of the vehicle in operation as they can contribute to broken axles, hot axle boxes, and damaged rolling bearings and wheels. The high loads also induce damage in the track components such as rails and sleepers. Although this subject has been studied numerically and experimentally over the last few years, the wheel flat problem has focused on ballasted tracks, and there is a need to understand the phenomena also for slab tracks. In this research, a numerical approach was used to show the effects of the wheel flats with different geometric configurations on the dynamic behavior of a classical ballasted track and a continuous slab track. Several wheel flat geometries and different vehicle speeds were considered. The nonlinear Hertzian contact model was used because of the high dynamic variation of the interaction of the load between the vehicle and the rail. The results evidenced that, for the same traffic conditions, the dynamic force was higher on the slab track than on the ballasted one, contrary to the maximum vertical displacement, which was higher on the ballasted track due to the track differences regarding the stiffness and frequency response. The results are useful for railway managers who wish to monitor track deterioration under the regulatory limits.

show abstract

“…The variation of the dynamic load on the track due to the wheel flat obtained in this numerical study was similar to that found by other authors, such as [12,38,39].…”

Section: Ballasted Tracksupporting

confidence: 91%

“…To detect and diagnose wheel defects, the problem has to be fully understood both experimentally and numerically. The most relevant and recent contributions to the wheel flat problem [7][8][9][10][11][12][13][14][15][16][17][18][19] focused on ballasted tracks, and studies on slab track systems are lacking.…”

Section: Introductionmentioning

confidence: 99%

Wheel Flats in the Dynamic Behavior of Ballasted and Slab Railway Tracks

Vale

2021

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The critical issue is to find the correct values for all these parameters. This simple track model is adequate for simulating the vehicle-track interaction and vehicle dynamics for frequencies up to about 20 Hz, but is not suited to study other effects such as forces in the individual track components, effects of wheel flats, 12 local variations in the track support, broken rail, 13 rail corrugation, etc.…”

Section: Infrastructurementioning

confidence: 99%

On integrated wheel and track damage prediction using vehicle–track dynamic simulations

Casanueva

Enblom

Stichel

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

The renewal costs for wheels and rails are a substantial part of the costs for rolling stock operators and infrastructure managers all over the world. The causes for reprofiling or grinding are, in most cases, related to the following: (1) wheel or rail profiles with unacceptable wear, (2) appearance of rolling contact fatigue cracks in the surface, and (3) wheel flats caused by locking wheels during braking. The first two causes are related to the dynamic behavior of the vehicletrack system, and can be predicted using multibody simulations. However, there are several limitations that restrain the usefulness of these prediction techniques, such as simulation time constraints, necessary simplifications, and lack of experimental data that lead to educated assumptions. In this paper, we take the end-user perspective in order to show whether the latest developments in wheel-rail damage prediction can be integrated in a simplified framework, and subsequently used by the different stakeholders for an improved management of the different assets involved in the operation of rail vehicles.

show abstract

“…Theoretically, a number of theoretical analysis models of wheel flats have been developed using a Hertzian spring as the contact model and inducing a relative displacement excitation to describe the wheel flat. [5][6][7][8][9][10] However, the linear Hertzian contact theory, which is based on a half-space assumption, is difficult to describe accurately the wheel-rail impact behavior due to its nonlinearity of materials and the dynamic contact. Consequently, some 3D non-Hertzian contact models were proposed to investigate the dynamic wheel-rail impact behavior.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of the wheel–rail impact behavior induced by a wheel flat for high-speed trains: The influence of strain rate

Han

Jing

Zhao

2017

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

The wheel–rail impact response induced by a wheel flat for high-speed trains is simulated numerically, based on the strain rate-dependent constitutive parameters of wheel–rail materials, using the finite element software LS-DYNA explicit algorithm. Influences of the speed of the train, the length of the wheel flat, and axle load on the wheel–rail impact behavior are discussed over a wide range, in terms of the vertical impact force, von Mises equivalent stress, shear stress, and equivalent plastic strain. The maximum wheel–rail impact forces are 2.6–4.4 times greater than the corresponding static axle loads due to the presence of a wheel flat. The maximum von Mises equivalent stress and equivalent plastic strain have occurred on the wheel–rail contact surface, while the maximum xy shear stress has often occurred on the subsurface of 4–6 mm below the contact surface. The wheel–rail impact responses induced by a wheel flat are sensitive to the speed of trains, flat length, and axle load. Besides, the strain rate effect of wheel–rail materials has a significant influence on the maximum von Mises equivalent stress, shear stress, and equivalent plastic strain, while it has no influence on the maximum vertical impact force. These findings are very helpful to guide the maintenance and repair of wheel–rail components in rail transport.

show abstract

A time domain wheelflat/track FE model

Cited by 5 publications

References 6 publications

Wheel Flats in the Dynamic Behavior of Ballasted and Slab Railway Tracks

Wheel Flats in the Dynamic Behavior of Ballasted and Slab Railway Tracks

On integrated wheel and track damage prediction using vehicle–track dynamic simulations

Finite element analysis of the wheel–rail impact behavior induced by a wheel flat for high-speed trains: The influence of strain rate

Contact Info

Product

Resources

About