scholarly journals Calculation of locomotive traction force in transient rolling contact

2017 ◽  
Vol 11 (1) ◽  
Author(s):  
Petr Voltr
Keyword(s):  
Traction Force ◽  
Rolling Contact ◽  
Transient Rolling

A numerical method for rolling contact problems with traction force and differential slip

1998 ◽  
Vol 22 (1) ◽  
pp. 51-60
Author(s):  
Kunihiko Kakoi ◽  
Masataka Tanaka ◽  
Tadao Ohyama ◽  
Takanori Obara
Keyword(s):  
Numerical Method ◽  
Traction Force ◽  
Contact Problems ◽  
Rolling Contact ◽  
Differential Slip

A Possible Mechanism for Rail Dark Spot Defects

1998 ◽  
Vol 120 (2) ◽  
pp. 304-309 ◽  
Author(s):  
M. Kaneta ◽  
K. Matsuda ◽  
K. Murakami ◽  
H. Nishikawa
Keyword(s):  
Fracture Mechanics ◽  
Fatigue Failure ◽  
High Speed ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Traction Force ◽  
Rolling Contact ◽  
Dark Spot ◽  
A Posteriori ◽  
Direction Opposite

Rail dark spot defect, also termed squat failure or shelling, which is a kind of rolling contact fatigue failure and occurs frequently on running surfaces of railway rails carrying high speed traffic, is one of the most dangerous rail failures. The dark spot crack is characterized by a principal crack propagating in the direction of traffic and a second crack growing in the direction opposite to traffic. By using a newly developed two-disk machine, the authors have succeeded in reproducing very similar dark spot cracks to those which appear in actual rails. It is found that the dark spot defects are caused by frequent repetitions of dry and wet runnings, and that the traction force plays an important role for the occurrence of the cracks. The principal crack may occur from a tiny pit formed a posteriori on the contacting surface and after that, the second crack is formed by cracks branched from the extended principal crack. It has also been proved experimentally that water is capable of entering the tip of the crack. Furthermore, a possible mechanism for the dark spot cracking has been proposed on the basis of the fracture mechanics approach.

A solution of transient rolling contact with velocity dependent friction by the explicit finite element method

2016 ◽  
Vol 33 (4) ◽  
pp. 1033-1050 ◽  
Author(s):  
Xin Zhao ◽  
Zili Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Problem ◽  
Rolling Contact ◽  
Explicit Finite Element Method ◽  
Content Type ◽  
Explicit Finite Element ◽  
Friction Law ◽  
Transient Rolling ◽  
Element Method

Purpose – The purpose of this paper is to develop a numerical approach to solve the transient rolling contact problem with the consideration of velocity dependent friction. Design/methodology/approach – A three dimensional (3D) transient FE model is developed in elasticity by the explicit finite element method. Contact solutions with a velocity dependent friction law are compared in detail to those with the Coulomb’s friction law (i.e. a constant coefficient of friction). Findings – The FE solutions confirm the negligible influence of the dependence on the normal contact. Hence, analysis is focussed on the tangential solutions under different friction exploitation levels. In the trailing part of the contact patch where micro-slip occurs, very high-frequency oscillations are excited in the tangential plane by the velocity dependent friction. This is similar to the non-uniform sliding or tangential oscillations observed in sliding contact. Consequently, the micro-slip distribution varies greatly with time. However, the surface shear stress distribution is quite stable at different instants, even though it significantly changes with the employed friction model. Originality/value – This paper proposes an approach to solve the transient rolling contact problem with the consideration of velocity dependent friction. Such a problem was usually solved in the literature by the simplified contact algorithms, with which detailed contact solutions could not be obtained, or with the assumption of steady rolling.

Transient Rolling Contact Phenomena

1971 ◽  
Vol 14 (3) ◽  
pp. 177-184 ◽  
Author(s):  
J. J. Kalker
Keyword(s):  
Rolling Contact ◽  
Transient Rolling

scholarly journals Hysteretic Friction for the Transient Rolling Contact Problem of Linear Viscoelasticity

2000 ◽  
Vol 68 (4) ◽  
pp. 589-595 ◽  
Author(s):  
D. L. Chertok ◽  
J. M. Golden ◽  
G. A. C. Graham
Keyword(s):  
Integral Equation ◽  
Contact Problem ◽  
Rolling Contact ◽  
Interval Length ◽  
Variable Speed ◽  
Variable Loading ◽  
Standard Linear ◽  
Transient Rolling ◽  
Rigid Indentor ◽  
Hysteretic Friction

The problem of a smooth rigid indentor under variable loading moving across a viscoelastic half-space in one direction with variable speed is considered. The motion is assumed to be frictionless and the standard linear model is adopted to describe the viscoelastic material response. An integral equation is derived and a numerical algorithm for its solution subject to appropriate subsidiary conditions is constructed. The contact interval length, pressure, and coefficient of hysteretic friction are presented and the results discussed.

scholarly journals Research on the relationship between the rail corrugation and the vibration response of the wheel-rail system

2020 ◽  
Vol 308 ◽  
pp. 02002
Author(s):  
Xinyu Jia ◽  
Guoqing Li ◽  
Xiubo Liu ◽  
Peng Chen
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
High Speed ◽  
Rolling Contact ◽  
Common Phenomenon ◽  
Rail Corrugation ◽  
Rail System ◽  
Train Operation ◽  
Transient Rolling ◽  
The Relationship

Rail corrugation is a very common phenomenon in high-speed railways. Rail corrugation can cause increased vibration of trains and tracks, and may even affect the safety of train operation. Therefore, this paper will analyze the vibration of the wheel-rail system caused by the rail corrugation. The actual transient rolling contact model is established by using explicit and implicit finite element methods. Through the calculation of the wheel-rail contact force and the wheel-rail mode, the vibration relationship between the rail corrugation and the wheel-rail system is obtained. It can provide some references for further analysis of the cause of rail corrugation.

Sign in / Sign up

Export Citation Format

Share Document