Effect of Rail Wear on Wheel/rail Rolling Contact Conditions

2018 ◽  
Vol 54 (4) ◽  
pp. 142
Author(s):  
Junjun DING
Keyword(s):  
Rolling Contact ◽  
Contact Conditions ◽  
Rail Wear

Incipient Slip and Frictional Creep of Tyred Systems

2008 ◽  
Author(s):  
Saverio Reina ◽  
Daniele Dini
Keyword(s):  
Systematic Study ◽  
Rolling Contact ◽  
Two Dimensional ◽  
Elastic Strip ◽  
Moving Loads ◽  
Load Case ◽  
Contact Conditions ◽  
Substrate Interface ◽  
Interfacial Behaviour ◽  
Local Slip

This research presents a systematic study of the interfacial behaviour of tyred systems. A simplified two-dimensional contact model of an elastic strip, shrink-fitted onto a wheel, and subjected to different rolling contact conditions, has been developed. This model enables us to characterise the behaviour at the strip/substrate interface caused by a quasi-static application of moving loads on the surface of the layer. The solution is compared to the stationary load case and regimes of local slip, full stick, separation and frictional creep are identified and mapped for a variety of loading conditions, materials and geometries.

Prediction of Rail Profile Wear with the Increase of Vehicle Speed

2013 ◽  
Vol 716 ◽  
pp. 659-662
Author(s):  
Dong Hyong Lee ◽  
Jeong Won Seo ◽  
Seok Jin Kwon ◽  
Ha Young Choi
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Boundary Conditions ◽  
Rolling Contact ◽  
Finite Elements Method ◽  
Vehicle Speed ◽  
Two Dimensional ◽  
Contact Wear ◽  
Rail Wear ◽  
Finite Elements Model

A method to simulate rolling contact wear in a rail surface was developed using the finite elements method and numerical analysis. A two-dimensional finite elements model was used in order to reduce the calculation time and boundary conditions to prevent excessive deformation of a wheel and a rail were applied. A numerical analysis of rail wear at rolling contact was predicted using the Archards equation. In addition, the characteristics of rail wear with the increasing speed of vehicle were analyzed. Results show that there was not a large difference in the depths of wear on the rail head with increasing vehicle speed, but the wear on the rail gauge corner increased with increasing vehicle speed.

Wheel–rail low adhesion issues and its effect on wheel–rail material damage at high speed under different interfacial contaminations

2019 ◽  
Vol 233 (15) ◽  
pp. 5477-5490 ◽  
Author(s):  
Bing Wu ◽  
Boyang An ◽  
Zefeng Wen ◽  
Wenjian Wang ◽  
Tao Wu
Keyword(s):  
High Speed ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Experimental Results ◽  
Test Rig ◽  
Adhesion Mechanism ◽  
Numerical Investigations ◽  
Rail Wear ◽  
Adhesion Condition

The objective of this paper is to ascertain the wheel–rail low adhesion mechanism using a high-speed wheel–rail rolling contact test rig under different interfacial contaminations. Based on the experimental results, a numerical method was proposed to investigate the wheel–rail wear and rolling contact fatigue due to low adhesion issues. The experimental results indicated that the wheel–rail low adhesion phenomena can happen under interfacial liquid contaminations, especially at high-speed running condition. Preliminary numerical investigations showed that the low adhesion condition can easily lead to sliding hence serious wear, especially at the speed between 160 km/h and 200 km/h. The temperature rise within the contact patch can be significantly more severe once wheel and rail are in full slip, causing rolling contact fatigue due to material softening.

scholarly journals Effect of Surface Hardening on Dynamic Frictional Rolling Contact Behavior and Degradation of Corrugated Rail

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yuan Gao ◽  
Jingmang Xu ◽  
Ping Wang ◽  
Yibin Liu
Keyword(s):  
Surface Hardening ◽  
Matrix Material ◽  
Rolling Contact ◽  
Superposition Method ◽  
Wear Depth ◽  
Plasma Surface ◽  
Contact Behavior ◽  
Rail Wear ◽  
The Matrix ◽  
Effect Of Surface

The present study was undertaken to evaluate the effect of surface hardening technology on dynamic frictional rolling contact behavior and degradation of corrugated rail in Shenzhen. Characteristic parameters such as length and depth of corrugation were analyzed by means of a continuous measurement method based on the corrugation analysis trolley. The explicit finite element method for material hardening characteristics and real contact geometry was adopted to set up the 3D transient FE model of wheel and rail, after which the value and distribution of stress/strain as well as contact solutions could be obtained during frictional contact, and then the Archard wear model and simplified wear superposition method are integrated as a numerical simulation tool for rail wear after hardening. The simulation results show that laminar plasma surface hardening technology can increase residual stress and shear stress in quenched zones, leading to local stress concentration at their boundaries; the plastic strain in the matrix material is higher than that in the quenched zones, while the strain concentration is mainly focused on the matrix material. The hardening can remarkably reduce the rail wear along the corrugation wave, and the wear depth of material with hardening technology is about 36% of that of nonhardening material. Laminar plasma surface hardening technology can therefore restrain the development of rail corrugation.

Application of Selected Multiaxial High-Cycle Fatigue Criteria to Rolling Contact Problems

2013 ◽  
Vol 542 ◽  
pp. 157-170 ◽  
Author(s):  
Paweł Romanowicz
Keyword(s):  
High Cycle Fatigue ◽  
Rolling Contact Fatigue ◽  
Roller Bearing ◽  
Three Dimensional ◽  
Contact Fatigue ◽  
Contact Problems ◽  
Rolling Contact ◽  
Cycle Fatigue ◽  
Contact Conditions ◽  
Tractive Rolling

The risk of fatigue failure of elements working in rolling contact conditions (such as railway wheels, rolling bearings, etc.) is a significant issue with respect to safety and economy. In this case the complex and non-proportional stress state with pulsating three dimensional compression occurs. Therefore, the analysis of fatigue life of structures working in rolling contact conditions can be performed using recently proposed multiaxial high-cycle fatigue criteria. However, there is no hypothesis that could be universally accepted for calculations of fatigue strength. Furthermore, not all criteria proposed in literature for rolling contact fatigue (RCF) analysis can predict it. In the paper, the most popular criteria based on different theories are investigated in the application to RCF problem. Moreover, modification of the popular Dang Van hypothesis is proposed. The problem of free and tractive rolling contact fatigue is analysed on the example of a cylindrical crane wheel and spherical thrust roller bearing.

Numerical analysis of the effect of track parameters on the wear of turnout rails in high-speed railways

2016 ◽  
Vol 232 (3) ◽  
pp. 709-721 ◽  
Author(s):  
Jingmang Xu ◽  
Ping Wang ◽  
Jian Wang ◽  
Boyang An ◽  
Rong Chen
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
High Speed ◽  
Numerical Procedure ◽  
Dynamic Interaction ◽  
Operating Conditions ◽  
Rolling Contact ◽  
Wear Model ◽  
Rail Wear ◽  
Railway Turnout

In this study, a numerical procedure is developed to predict the wear of turnout rails, and the effect of track parameters is investigated. The procedure includes simulation of the dynamic interaction between the train and the turnout, the rolling contact analysis, and the wear model. The dynamic interaction is simulated with the validated commercial software Simpack that uses a space-dependent model of a railway turnout. To reproduce the actual operating conditions of a railway turnout, stochastic variations in the input parameters are considered in the simulation of the dynamic interaction. The rolling contact is analyzed with the semi-Hertzian method and improved FASTSIM algorithm, which enable the contact model to deal with situations of multipoint contact and nonelliptic contact. Based on the Archard’s wear law, the wear model requires the calculation of normal/tangential stresses and a relative slide on the contact patches. The numerical procedure is performed for the selected sections of the vehicle, which runs through the railway turnout in the diverging route. By using the numerical procedure, the effect of track parameters (track gage, rail inclination, and friction coefficient) on the wear of turnout rails is analyzed. The results show that the wear of the front wheelset is more serious than the wear of the rear wheelset for a single vehicle. The degree of wear of switch rails is more severe than that of the stock rails and the difference is more obvious for the front wheelset of the switch rails. The wear of switch rails is mainly concentrated on the rail gage corner, while the wear of stock rails is mainly concentrated on the rail crown. For the analysed CN60-1100-1:18 turnout and the high-speed vehicle CRH2 in China, the rail wear rate could be slowed down by increasing the track gage and decreasing the rail inclination. Alternatively, the rail wear rate could be slowed by decreasing the friction coefficient; however, the variation of wear depth is quite small for friction coefficients that are larger than 0.3.

Rolling Contact Fatigue and Wear Behavior of Rail Steel under Dry Rolling-Sliding Contact Condition

2014 ◽  
Vol 891-892 ◽  
pp. 1545-1550
Author(s):  
Jung Won Seo ◽  
Hyun Kyu Jun ◽  
Seok Jin Kwon ◽  
Dong Hyeong Lee
Keyword(s):  
Crack Growth ◽  
Rail Steel ◽  
Wear Behavior ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Sliding Contact ◽  
Maintenance Cost ◽  
Rail Wear ◽  
Railway System

Rolling contact fatigue and wear of rails are inevitable problems for railway system due to wheel and rail contact. Increased rail wear and increased fatigue damage such as shelling, head check, etc. require more frequent rail exchanges and more maintenance cost. The fatigue crack growth and wear forming on the contact surface are affected by a variety of parameters, such as vertical and traction load, friction coefficient on the surface. Also, wear and crack growth are not independent, but interact on each other. Surface cracks are removed by wear, which can be beneficial for rail, however too much wear shortens the life of rail. Therfore, it is important to understand contact fatigue and wear mechanism in rail steels according to a variety of parameters. In this study, we have investigated fatigue and wear characteriscs of rail steel using twin disc testing. Also the comparative wear behavior of KS60 and UIC 60 rail steel under dry rolling-sliding contact was performed.

Durability of plasma-sprayed Cr3C2-NiCr coatings under rolling contact conditions

2011 ◽  
Author(s):  
Xiancheng Zhang ◽  
Fuzhen Xuan ◽  
Shantung Tu ◽  
Binshi Xu ◽  
Yixiong Wu
Keyword(s):  
Rolling Contact ◽  
Contact Conditions ◽  
Plasma Sprayed
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