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X S Jin - One of the best experts on this subject based on the ideXlab platform.
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investigation on Adhesion characteristic of wheel rail under the magnetic field condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2016Co-Authors: W J Wang, M.-h. Zhu, Q Y Liu, Heji Zhang, X S JinAbstract:The aim of this study is to explore the influence of magnetic field and surface roughness on the Adhesion Coefficient of wheel/rail using a JD-1 wheel/rail simulation facility. The results indicate that the magnetic field has a significant influence on the Adhesion Coefficient under the water and oil conditions by means of magnetic force on the wheel/rail contact zone. The use of magnetic field is beneficial to increase the Adhesion Coefficient of wheel/rail interface. The speed has no visible effect on Adhesion Coefficient under the magnetic field condition. Increasing surface roughness improves the Adhesion level of wheel/rail interface under the water and oil conditions.
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influence of friction modifiers on improving Adhesion and surface damage of wheel rail under low Adhesion conditions
Tribology International, 2014Co-Authors: Wen Jian Wang, Qing Yang Liu, T F Liu, M.-h. Zhu, Hengyu Wang, X S JinAbstract:The objective of this study is to investigate the influence of friction modifiers on improving Adhesion and surface damage of wheel/rail under low Adhesion conditions. The results indicate that water, oil and leaves are very easy to bring low Adhesion phenomena. Sand, alumina particle and abrasive block can improve Adhesion Coefficient under various low Adhesion conditions. Sanding significantly aggravates wear and surface damage of wheel/rail materials. It is proposed that alumina particles are more suitable for improving Adhesion of wheel/rail interface based on a comprehensive analysis of experimental results.
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experimental investigation of Adhesion Coefficient of wheel rail under the track ramp conditions
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2014Co-Authors: W J Wang, M.-h. Zhu, Q Y Liu, Guo Hy J Wang, X S JinAbstract:In order to explore Adhesion behavior of wheel/rail under the track ramp conditions, the wheel/rail contact of ascent and descent tracks has been achieved by means of clamp change of simulation wheel. The Adhesion experiments of wheel/rail were carried out using a JD-1 wheel/rail simulation facility under dry and water conditions. The results indicate that the Adhesion Coefficient of wheel/rail of ramp track has a significant fall compared with the level track condition under dry and water conditions. The ascent and descent tracks have some differences of Adhesion Coefficient under the same track gradient condition due to different wheel/rail interaction. Furthermore, the Adhesion Coefficient of descent track is smaller than that of ascent track under the dry and water condition. Oil contamination is a significant factor on the Adhesion behavior of wheel/rail interface. Furthermore, the ramp track has no obvious influence on Adhesion Coefficient of wheel/rail under oil condition.
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experimental investigation of Adhesion Coefficient of wheel rail under the track ramp conditions
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2014Co-Authors: W Wang, M.-h. Zhu, Q Y Liu, Guo Hy J Wang, X S JinAbstract:In order to explore Adhesion behavior of wheel/rail under the track ramp conditions, the wheel/rail contact of ascent and descent tracks has been achieved by means of clamp change of simulation whe...
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sub scale simulation and measurement of railroad wheel rail Adhesion under dry and wet conditions
Wear, 2013Co-Authors: Wen Jian Wang, Qing Yang Liu, M.-h. Zhu, Hengyu Wang, Hongbo Wang, Jun Guo, X S JinAbstract:Abstract The Adhesion characteristics of railroad wheels against rails were simulated using a sub-scale wheel/rail configuration. The apparatus consists of a small roller to simulate the locomotive or rolling stock wheel and a large roller to simulate the rail. The scale of the wheel/rail profiles, relative to full size, is 1:4. Results indicated that this laboratory test can be used to adequately simulate and evaluate the Adhesion behavior of the wheel/rail interface under various conditions. Under dry conditions, the Adhesion Coefficient of wheel/rail has a sharp initial increase of between 0% and 1.5% as creep ratio increases, and then a slight reduction of up to 5%. The presence of water or oil markedly decreases the Adhesion Coefficient of wheel/rail. With an increase of speed and due to the water volume in the wheel/rail surface, the Adhesion Coefficient drops. With an increase of lateral force, the Adhesion Coefficient of wheel/rail increases. Axle load has no obvious effect on the Adhesion Coefficient in the presence of water. Tree leaves have an important effect on the Adhesion Coefficient and should be cleared away from the contact surface of wheel/rail if water is present. Further work on improving Adhesion and damage of wheels on rails should be studied and explored under a range of low Adhesion conditions.
M.-h. Zhu - One of the best experts on this subject based on the ideXlab platform.
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investigation on Adhesion characteristic of wheel rail under the magnetic field condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2016Co-Authors: W J Wang, M.-h. Zhu, Q Y Liu, Heji Zhang, X S JinAbstract:The aim of this study is to explore the influence of magnetic field and surface roughness on the Adhesion Coefficient of wheel/rail using a JD-1 wheel/rail simulation facility. The results indicate that the magnetic field has a significant influence on the Adhesion Coefficient under the water and oil conditions by means of magnetic force on the wheel/rail contact zone. The use of magnetic field is beneficial to increase the Adhesion Coefficient of wheel/rail interface. The speed has no visible effect on Adhesion Coefficient under the magnetic field condition. Increasing surface roughness improves the Adhesion level of wheel/rail interface under the water and oil conditions.
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the effect of alumina particle on improving Adhesion and wear damage of wheel rail under wet conditions
Wear, 2016Co-Authors: X Cao, Qing Yang Liu, C. G. He, Wen Jian Wang, W.-l. Huang, Junqi Peng, Jun Guo, M.-h. ZhuAbstract:Abstract The objective of this study was to explore the effect of alumina particle on improving Adhesion and wear damage of wheel/rail under wet conditions using a rolling–sliding wear apparatus. The results indicate that alumina particles significantly improve Adhesion Coefficient under wet conditions. The Adhesion Coefficient declines with the alumina particle size increasing from S (about 75 μm) to L (about 250 μm) and then keeps stable. Meanwhile, the Adhesion Coefficient increases firstly with the feed rate increasing from 1 to 3 g/min, and then decreases from 3 to 7 g/min, subsequently, keeps stable to 10 g/min. With an increase in particle size and feed rate, the wear rates of wheel/rail rollers increase, the thickness of plastic deformation layers and surface hardness decrease, and the damage mechanism turns from slight spalling to severe spalling and big pit. The embedded alumina particles on the roller surface produce high stress and change the plastic deformation line. Fatigue cracks develop from the surface and the wall of the pit on the rollers, and tend to connect with each other resulting in the removal of material. Furthermore, the interlayer material in the severe cracks tends to break.
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influence of friction modifiers on improving Adhesion and surface damage of wheel rail under low Adhesion conditions
Tribology International, 2014Co-Authors: Wen Jian Wang, Qing Yang Liu, T F Liu, M.-h. Zhu, Hengyu Wang, X S JinAbstract:The objective of this study is to investigate the influence of friction modifiers on improving Adhesion and surface damage of wheel/rail under low Adhesion conditions. The results indicate that water, oil and leaves are very easy to bring low Adhesion phenomena. Sand, alumina particle and abrasive block can improve Adhesion Coefficient under various low Adhesion conditions. Sanding significantly aggravates wear and surface damage of wheel/rail materials. It is proposed that alumina particles are more suitable for improving Adhesion of wheel/rail interface based on a comprehensive analysis of experimental results.
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experimental investigation of Adhesion Coefficient of wheel rail under the track ramp conditions
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2014Co-Authors: W J Wang, M.-h. Zhu, Q Y Liu, Guo Hy J Wang, X S JinAbstract:In order to explore Adhesion behavior of wheel/rail under the track ramp conditions, the wheel/rail contact of ascent and descent tracks has been achieved by means of clamp change of simulation wheel. The Adhesion experiments of wheel/rail were carried out using a JD-1 wheel/rail simulation facility under dry and water conditions. The results indicate that the Adhesion Coefficient of wheel/rail of ramp track has a significant fall compared with the level track condition under dry and water conditions. The ascent and descent tracks have some differences of Adhesion Coefficient under the same track gradient condition due to different wheel/rail interaction. Furthermore, the Adhesion Coefficient of descent track is smaller than that of ascent track under the dry and water condition. Oil contamination is a significant factor on the Adhesion behavior of wheel/rail interface. Furthermore, the ramp track has no obvious influence on Adhesion Coefficient of wheel/rail under oil condition.
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experimental investigation of Adhesion Coefficient of wheel rail under the track ramp conditions
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2014Co-Authors: W Wang, M.-h. Zhu, Q Y Liu, Guo Hy J Wang, X S JinAbstract:In order to explore Adhesion behavior of wheel/rail under the track ramp conditions, the wheel/rail contact of ascent and descent tracks has been achieved by means of clamp change of simulation whe...
W J Wang - One of the best experts on this subject based on the ideXlab platform.
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study on the wheel rail Adhesion restoration and damage evolution in the single application of alumina particles
Wear, 2019Co-Authors: L. B. Shi, Milan Omasta, D. Kvarda, Radovan Galas, Q. Li, W J Wang, J. Guo, Qi Yue LiuAbstract:Abstract The aim of this study is to explore the wheel/rail Adhesion restoration performance of alumina particles and the comparison between the continuous and single application test strategies in twin disc simulation. The results indicate that the single application test strategy performs better on evaluating the Adhesion restoring ability of solid particles. In the single application tests, the restored Adhesion Coefficient increases with the applied alumina quantity and final gets stable when the quantity exceeds 2 g (0.607 g/m). However, the increase of alumina quality could always extend the duration of restored Adhesion. The alumina particles at the size in the range of 0.075–0.15 mm showed the best Adhesion restoration and the longest duration was achieved at the size of 0.15 mm. In addition, it is observed that the serious damage is mainly caused in the particles crushing process, and will be gradually ground off in the following long running to have no threat on the serving life of the wheel and the rail.
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influence of low temperature environment on the Adhesion characteristics of wheel rail contact
Tribology International, 2018Co-Authors: L. B. Shi, Z R Zhou, Q Y Liu, J. Guo, W J WangAbstract:Abstract The effects of low temperature on the Adhesion Coefficient under both dry and degraded Adhesion conditions are investigated using a rolling-sliding apparatus. The results indicate that the Adhesion Coefficient would be improved at low temperatures under dry condition for weakened surface oxidation. In both room- and low-temperature environments, water, oil and antifreeze decrease the Adhesion Coefficient to a low level. Low temperature prolongs the Adhesion recovery process under water conditions. The recovery process of the Adhesion Coefficient has not been observed under oil condition, except at −40 °C. The Adhesion recovery process under antifreeze condition is considerably longer than that under water condition; the longest process is at 0 °C, while the shortest is at −40 °C.
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on the wear and damage characteristics of rail material under low temperature environment condition
Wear, 2018Co-Authors: W J WangAbstract:Abstract This study presents the wear and damage behaviours of U71Mn rail material with a friction pair of ER8 wheel material under different temperature conditions, which were explored using a rolling-sliding wear testing device. It turns out that, compared to those at 20 °C room temperature, the Adhesion Coefficient, wear rate and hardness all increase at low temperatures. Meanwhile, three types of damage mechanisms are proposed according to wear and rolling contact fatigue (RCF) behaviours under different temperature conditions: (a) room temperature (RT) damage mechanism, (b) ductile-brittle transition temperature (DBTT) damage mechanism, (c) below ductile-brittle transition temperature (BDBTT) damage mechanism. With the temperature decreasing from room to low temperature, the wear mechanism transforms from abrasive wear to adhesive wear and surface fatigue. Meanwhile, the rail material gradually becomes brittle and the subsurface damage at low temperature is more serious than that at room temperature. Furthermore, the subsurface damage at −15 °C is the worst. At low temperature, there is a wider size range of wear debris than that at room temperature.
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investigation on Adhesion characteristic of wheel rail under the magnetic field condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2016Co-Authors: W J Wang, M.-h. Zhu, Q Y Liu, Heji Zhang, X S JinAbstract:The aim of this study is to explore the influence of magnetic field and surface roughness on the Adhesion Coefficient of wheel/rail using a JD-1 wheel/rail simulation facility. The results indicate that the magnetic field has a significant influence on the Adhesion Coefficient under the water and oil conditions by means of magnetic force on the wheel/rail contact zone. The use of magnetic field is beneficial to increase the Adhesion Coefficient of wheel/rail interface. The speed has no visible effect on Adhesion Coefficient under the magnetic field condition. Increasing surface roughness improves the Adhesion level of wheel/rail interface under the water and oil conditions.
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numerical and experimental investigation on Adhesion characteristic of wheel rail under the third body condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2016Co-Authors: Hengyu Wang, W J Wang, Q Y LiuAbstract:A numerical model of wheel and rail lubricated by a third body was established using the partial elasto-hydrodynamic lubrication theory and multi-grid method. The effects of rolling speed, surface roughness, contact load, wheel diameter, and viscosity of third body on Adhesion Coefficient are explored. The results show that the rolling speed, surface roughness, and the viscosity of third body have a significant influence on Adhesion Coefficient when the wheel/rail interface is lubricated under oil and water conditions. Furthermore, to verify the precision of the numerical calculating results, some experiments were carried out by means of a JD-1 wheel/rail simulation facility. The results show that there is same changing trend and almost same Adhesion Coefficient between the curves of numerical and experimental results. The relative difference between the numerical and experimental results is less than 10%. This numerical method can be used to explore the Adhesion Coefficient of wheel/rail under the third ...
Xuesong Jin - One of the best experts on this subject based on the ideXlab platform.
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analysis on thermal effect on high speed wheel rail Adhesion under interfacial contamination using a three dimensional model with surface roughness
Wear, 2016Co-Authors: Zefeng Wen, Bing Wu, Tao Wu, Xuesong JinAbstract:Abstract A three-dimensional numerical model of wheel/rail in rolling contact is established to study the Adhesion characteristics under interfacial contamination considering surface roughness at high speed. The thermal partial elastohydrodynamic lubrication (EHL) theory in elliptical contact is used in the model. The numerical model is successfully solved by applying the iterative algorithm between the pressure field and temperature field. Multilevel method is used to solve modified Reynolds equation. Sweeping column method is used to solve energy and heat conduction equations. The effects of train speed, surface roughness amplitudes, roughness orientation and axle load on the Adhesion Coefficient under interfacial contamination are numerically investigated. A typical creepage-traction curve under oil contamination is obtained at high speed by the present model. In addition, the effects of temperature and the elastic-plastic deformation behaviour of asperities on the Adhesion Coefficient are discussed in the paper. Furthermore, the effect of different interfacial contaminations on wheel/rail Adhesion using the present model on the Adhesion Coefficient is investigated. In order to validate the present model, the numerical results are compared with the experimental results that were obtained by JD-2 high-speed wheel/rail rolling contact machine under water/oil contaminations.
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analysis of wheel and rail Adhesion under wet condition by using elastic plastic microcontact model wheel rail Adhesion wet condition e p deformation and temperature
Lubrication Science, 2015Co-Authors: Bing Wu, Zefeng Wen, Hengyu Wang, Xuesong JinAbstract:This paper presents a numerical model to investigate the Adhesion characteristics of the wheel/rail contact with consideration of surface roughness under wet conditions. The elastohydrodynamic lubrication theory is used to obtain the load carried by water, and the statistical elastic–plastic microcontact model presented by Zhao–Maietta–Chang is applied to calculate the load carried by asperities contact. Meanwhile, the thermal influencing reduction factor is used to consider the inlet heating effects on the film thickness, and the change of water viscosity is also taken into consideration due to the flash temperature generated by the moving rough surfaces. Furthermore, the present work investigates the dependence of the wheel/rail Adhesion Coefficient on train speed, surface roughness amplitude, the initial temperature, the plasticity index and the maximum contact pressure under wet condition. Copyright © 2014 John Wiley & Sons, Ltd.
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numerical analysis on wheel rail Adhesion under mixed contamination of oil and water with surface roughness
Wear, 2014Co-Authors: Bing Wu, Zefeng Wen, Hengyu Wang, Xuesong JinAbstract:Abstract A preliminary two dimensional numerical model of wheel/rail in rolling contact is established to study the Adhesion characteristics of wheel/rail with considering surface roughness under oil and water mixed contamination. A partial elastohydrodynamic lubrication (EHL) theory in line contact is applied in the model. The present numerical model is used to investigate the effects of contact pressures of wheel/rail, the volume fraction of oil and their locations in the contact zone, train speed on the Adhesion Coefficient under oil and water mixed contamination condition. In addition, the effects of oil contamination, water contamination and water/oil mixed contamination on the Adhesion Coefficient are compared. The numerical results show that the Adhesion Coefficient is greatly influenced by the train speed, the volume fraction of oil and their locations in the contact zone. Furthermore, in order to verify the accuracy of the numerical model, the numerical results are compared with the experimental results that were obtained by JD-1 wheel/rail simulation facility.
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analysis of wheel rail Adhesion under oil contamination with surface roughness
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2013Co-Authors: Bing Wu, Zefeng Wen, Hengyu Wang, Xuesong JinAbstract:The objective of this study is to investigate the Adhesion characteristics of wheel/rail under oil contamination with consideration of surface roughness using a three-dimensional model of wheel/rail in rolling contact. A partial elastohydrodynamic lubrication theory is employed in the model. An under-relaxation revision on the film thickness is used to keep the simulation procedure stable. The dependence of the wheel/rail Adhesion Coefficient on train speed, surface roughness amplitude, parameter of roughness orientation and axle load is studied under oil contamination. Moreover, the numerical solutions of a two-dimensional model are compared with those of the three-dimensional model. In addition, a good agreement has been found between the numerical results and the experimental results obtained by a JD-1 wheel/rail simulation facility, which consists of a small wheel roller serving as locomotive or rolling stock wheel and a large wheel roller serving as rail.
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Adhesion experiment on a wheel rail system and its numerical analysis
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2004Co-Authors: Xuesong Jin, W.h. Zhang, J Zeng, Z R Zhou, Q Y Liu, Z F WenAbstract:AbstractThe experiment on the Adhesion Coefficient of a wheel-rail system has been carried out by means of a full-scale test facility under the condition of different axle loads and rolling speeds....
Hengyu Wang - One of the best experts on this subject based on the ideXlab platform.
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numerical and experimental investigation on Adhesion characteristic of wheel rail under the third body condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2016Co-Authors: Hengyu Wang, W J Wang, Q Y LiuAbstract:A numerical model of wheel and rail lubricated by a third body was established using the partial elasto-hydrodynamic lubrication theory and multi-grid method. The effects of rolling speed, surface roughness, contact load, wheel diameter, and viscosity of third body on Adhesion Coefficient are explored. The results show that the rolling speed, surface roughness, and the viscosity of third body have a significant influence on Adhesion Coefficient when the wheel/rail interface is lubricated under oil and water conditions. Furthermore, to verify the precision of the numerical calculating results, some experiments were carried out by means of a JD-1 wheel/rail simulation facility. The results show that there is same changing trend and almost same Adhesion Coefficient between the curves of numerical and experimental results. The relative difference between the numerical and experimental results is less than 10%. This numerical method can be used to explore the Adhesion Coefficient of wheel/rail under the third ...
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analysis of wheel and rail Adhesion under wet condition by using elastic plastic microcontact model wheel rail Adhesion wet condition e p deformation and temperature
Lubrication Science, 2015Co-Authors: Bing Wu, Zefeng Wen, Hengyu Wang, Xuesong JinAbstract:This paper presents a numerical model to investigate the Adhesion characteristics of the wheel/rail contact with consideration of surface roughness under wet conditions. The elastohydrodynamic lubrication theory is used to obtain the load carried by water, and the statistical elastic–plastic microcontact model presented by Zhao–Maietta–Chang is applied to calculate the load carried by asperities contact. Meanwhile, the thermal influencing reduction factor is used to consider the inlet heating effects on the film thickness, and the change of water viscosity is also taken into consideration due to the flash temperature generated by the moving rough surfaces. Furthermore, the present work investigates the dependence of the wheel/rail Adhesion Coefficient on train speed, surface roughness amplitude, the initial temperature, the plasticity index and the maximum contact pressure under wet condition. Copyright © 2014 John Wiley & Sons, Ltd.
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influence of friction modifiers on improving Adhesion and surface damage of wheel rail under low Adhesion conditions
Tribology International, 2014Co-Authors: Wen Jian Wang, Qing Yang Liu, T F Liu, M.-h. Zhu, Hengyu Wang, X S JinAbstract:The objective of this study is to investigate the influence of friction modifiers on improving Adhesion and surface damage of wheel/rail under low Adhesion conditions. The results indicate that water, oil and leaves are very easy to bring low Adhesion phenomena. Sand, alumina particle and abrasive block can improve Adhesion Coefficient under various low Adhesion conditions. Sanding significantly aggravates wear and surface damage of wheel/rail materials. It is proposed that alumina particles are more suitable for improving Adhesion of wheel/rail interface based on a comprehensive analysis of experimental results.
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numerical analysis on wheel rail Adhesion under mixed contamination of oil and water with surface roughness
Wear, 2014Co-Authors: Bing Wu, Zefeng Wen, Hengyu Wang, Xuesong JinAbstract:Abstract A preliminary two dimensional numerical model of wheel/rail in rolling contact is established to study the Adhesion characteristics of wheel/rail with considering surface roughness under oil and water mixed contamination. A partial elastohydrodynamic lubrication (EHL) theory in line contact is applied in the model. The present numerical model is used to investigate the effects of contact pressures of wheel/rail, the volume fraction of oil and their locations in the contact zone, train speed on the Adhesion Coefficient under oil and water mixed contamination condition. In addition, the effects of oil contamination, water contamination and water/oil mixed contamination on the Adhesion Coefficient are compared. The numerical results show that the Adhesion Coefficient is greatly influenced by the train speed, the volume fraction of oil and their locations in the contact zone. Furthermore, in order to verify the accuracy of the numerical model, the numerical results are compared with the experimental results that were obtained by JD-1 wheel/rail simulation facility.
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analysis of wheel rail Adhesion under oil contamination with surface roughness
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2013Co-Authors: Bing Wu, Zefeng Wen, Hengyu Wang, Xuesong JinAbstract:The objective of this study is to investigate the Adhesion characteristics of wheel/rail under oil contamination with consideration of surface roughness using a three-dimensional model of wheel/rail in rolling contact. A partial elastohydrodynamic lubrication theory is employed in the model. An under-relaxation revision on the film thickness is used to keep the simulation procedure stable. The dependence of the wheel/rail Adhesion Coefficient on train speed, surface roughness amplitude, parameter of roughness orientation and axle load is studied under oil contamination. Moreover, the numerical solutions of a two-dimensional model are compared with those of the three-dimensional model. In addition, a good agreement has been found between the numerical results and the experimental results obtained by a JD-1 wheel/rail simulation facility, which consists of a small wheel roller serving as locomotive or rolling stock wheel and a large wheel roller serving as rail.