The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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...
The impact wear behaviour and damage mechanism and transitions of rail weld joint and rail materials were explored using a cyclic impact tester under dry conditions. The results indicate that the impact wear volume of rail weld joint and rail material increases with the number of impact cycles or impact force increasing and the resistance to impact wear of rail weld joint is better than that of rail...
The cracks of the wheel and rail materials have a vital role in determining the safety of railway transportation. This study is to explore the cracks propagation characteristics of wheel materials under the bending moment condition using a wheel/rail simulation facility and finite element method. The results indicate that the stress concentration is found at the tips of pre-cracks and the maximum...
The objective of this study is to evaluate the effect of slip ratio on the wear and rolling contact fatigue (RCF) of wheel/rail materials using a rolling–sliding wear testing apparatus. The results indicate that two wear types are presented in terms of wear rate: type I (mild wear) and type II (severe wear). In type I wear, cracks propagate parallel to the surface. While in type II, the peeling is...
Decarburization can remain on the surfaces of rail head steels and affect their wear and damage processes. The current research explored the influence of a decarburized layer on wear resistance and damage behavior of rail materials using a rolling–sliding wear testing machine. A decarburized layer decreases the hardness and wear resistance of rail steels, and the wear rate of a decarburized rail is...
The objective of this study is to explore the wear and rolling contact fatigue (RCF) characteristics of wheel materials under different operating speeds conditions using a small scale wheel/rail facility. The results indicate that the operating speed plays a vital role in the wear and RCF of wheel materials. As the operating speed increases, both the surface hardness and the hardness of the plastic...
The objective of this study is to construct wear mapping and transitions of wheel/rail materials under different contact pressure and sliding velocity conditions by means of comprehensive consideration of both wear rates and surface damage morphology of wheel/rail rollers. The results indicate that, both the wear rates of wheel rollers and the wear rates of rail rollers increase with contact pressure...
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 75μm) to L (about...
The grinding process for maintaining the railroad rails can affect their performance. A rail grinding friction testing apparatus was developed to investigate the effects of rotational speed of grinding stone on removal behavior of rail material. The rail-grinding stone contact consists of a round, flat grinding stone and two test specimens made from Mn–steel rails that are pressed against the face...
The aim of this study is to investigate the influence of laser cladding Fe-based alloy on microstructure and wear characteristic of wheel/rail materials using a rolling–sliding wear testing apparatus. Especially, the effect of lanthanum oxide on the properties of laser cladding coating was explored in detail. The results show that the laser cladding Fe-based alloy coating consists of dendrites and...
The objective of this study is to investigate the braking tribological characteristics of two kinds of metro brake shoe materials using a sub-scale frictional braking machine. The results indicate that the friction coefficient of braking interface has a close relationship with the velocity and pressure. The increase of velocity and pressure raises the temperature-rise of braking interface. The increasing...
The objective of this study is to investigate the effects of rotational speed on rolling wear and damage behaviors of wheel/rail materials using a rolling–sliding wear testing apparatus. The results indicate that, with the rotational speed increasing, the surface hardness of rail roller remains unchanged while the increase of surface hardness of wheel roller declines resulting in a decrease of wheel/rail...
The objective of this study is to investigate the effect of laser cladding coating on wear and damage behaviors of heavy-haul wheel/rail materials by means of a laboratory-scale rolling–sliding wear apparatus. The results indicate that the wheel/rail rollers with laser cladding form a uniform and compacted coating without any cracks or stomata. The laser cladding coating markedly improves wear-resistance...
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...
The aim of this paper is to investigate the adhesion behavior of wheel/rail under dry and water conditions using a JD-1 wheel/rail simulation facility. The results indicate that a wheel/rail simulation facility has been developed and used to assess the effect of dry and water lubricant conditions on adhesion behavior of wheel/rail. The adhesion coefficient of wheel/rail rises rapidly with the increase...
The coupling relationship between oblique fatigue crack and rail wear in curve track was investigated by means of field analysis and theoretical calculation. The field investigations indicate that while the side wear of rail is serious, the fatigue crack is relatively slight. The increase of rail wear rate can alleviate its fatigue damage. The relationship between side wear of rail and fatigue crack...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.