Effect of Surface Modification on the Tribological Properties of Friction Blocks in High-Speed Train Brake Systems

Fan, Zhiyong; Xiang, Zaiyu; Tang, Bin; Chen, W.; Qian, H.H.; Mo, Jiliang; Zhou, Zhengchun

doi:10.1007/s11249-021-01402-4

Cited by 25 publications

(9 citation statements)

References 50 publications

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“…The surface morphology of copper-based and iron-based friction materials were closely related to the friction temperature. 8 The surface friction film was mainly granular at low temperature, while it presented a dense plateau at high temperature. 2,3 The heat dissipation improved with the radial extension and circumferential shortening of the pad.…”

Section: Discussionmentioning

confidence: 98%

“…The tribological behavior of the braking interface is extremely complex due to strong contact and high thermal load. 1 Many factors will affect the tribological behavior of the braking interface and ultimately affect the braking performance of the train，such as friction film, 2–4 surface morphology, 2,4–6 friction heat generation and distribution, 7–10 contact stress magnitude, 1,9–12 etc. In the actual braking process, the contact between the pad and the disc cannot be fully matched.…”

Section: Introductionmentioning

confidence: 99%

“…In the actual braking process, the contact between the pad and the disc cannot be fully matched. The partial wear lead to excessive local temperature and stress concentration on the surface of the disc, 8,9 which will damage the service life of the brake system. 13,14 Therefore, it is necessary to explore the influence of partial wear on the brake temperature field and friction performance.…”

Section: Introductionmentioning

confidence: 99%

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Influence of contacting shape of partial wear on friction properties of copper-based materials for trains

Han

Zhao

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In view of the fact that the contact between the pad and the disc cannot match perfectly in the actual braking process, the influence of contacting shape on the tribological performance was studied. Four copper-based brake pads in ratio (radial dimension / circumferential dimension) of 0.4, 0.6, 0.8 and 1.2 were used to perform contacting shape test on a small-scaled braking dynamometer at speeds 60 km/h, 100 km/h, 140 km/h and 180 km/h and contact pressure 0.5 MPa. The results indicated that contacting shape caused the difference of temperature of the brake system, which affected the friction performance. The peak temperature of the disc decreased from 331°C to 293.2°C with ratio increasing, and the maximum effective stress of the disc decreased 15%. In ratio of 0.4, the higher friction temperature and effective stress made the friction surface easy to plough, so the friction coefficient was low and the wear was nonuniform. In ratio of 1.2, the wear particles accumulated, resulting in high friction coefficient and uniform wear.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of contacting shape of partial wear on friction properties of copper-based materials for trains

Han

Zhao

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…So structural integrity and dimensional stability of these components must be verified. Wear, roughness and tribological features such as generation of micro-cracking are also investigated (Fan, 2021;Wang et al 2015). Testing programs are periodically updated to take count of technological improvement of braking technology.…”

Section: Layout and Functionalities Of A Dynamometric Test Rigmentioning

confidence: 99%

Modeling, testing and validation of the vibrational behavior of a dynamometric test rig for railway braking systems

Pugi

Rosano

Viviani³

et al. 2023

WJE

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Purpose The purpose of this work is to optimize the monitoring of vibrations on dynamometric test rigs for railway brakes. This is a quite demanding application considering the continuous increase of performances of high-speed trains that involve higher testing specifications for brake pads and disks. Design/methodology/approach In this work, authors propose a mixed approach in which relatively simple finite element models are used to support the optimization of a diagnostic system that is used to monitor vibration levels and rotor-dynamical behavior of the machine. The model is calibrated with experimental data recorded on the same rig that must be identified and monitored. The whole process is optimized to not interfere with normal operations of the rig, using common inertial sensor and tools and are available as standard instrumentation for this kind of applications. So at the end all the calibration activities can be performed normally without interrupting the activities of the rig introducing additional costs due to system unavailability. Findings Proposed approach was able to identify in a very simple and fast way the vibrational behavior of the investigated rig, also giving precious information concerning the anisotropic behavior of supports and their damping. All these data are quite difficult to be found in technical literature because they are quite sensitive to assembly tolerances and to many other factors. Dynamometric test rigs are an important application widely diffused for both road and rail vehicles. Also proposed procedure can be easily extended and generalized to a wide value of machine with horizontal rotors. Originality/value Most of the studies in literature are referred to electrical motors or turbomachines operating with relatively slow transients and constant inertial properties. For investigated machines both these conditions are not verified, making the proposed application quite unusual and original with respect to current application. At the same time, there is a wide variety of special machines that are usually marginally covered by standard testing methodologies to which the proposed approach can be successfully extended.

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“…The conclusion exhibited that when the carbon content is 20 Wt.%, the thermal conductivity deviation between brake disc and pads was the smallest, which prompted a balanced distribution of friction heat, thereby reducing the temperature gradient of friction pair. Fan et al (2021) conducted a drag brake test with perforated brake pads. The center holes were filled with three material including Cu-based powder metallurgy material, composite material and Mn–Cu damping alloy, respectively.…”

Section: Introductionmentioning

confidence: 99%

Braking-experimental study on the relationship between friction material type and brake disc temperature

Chen

Gao

et al. 2022

ILT

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Purpose This study aims to clarify the relationship of friction material type and brake disc temperature through braking experiment. Design/methodology/approach The braking performances of resin materials (RM), semimetallic materials (SM) and copper-based powder metallurgy materials (PM) friction blocks mating with forged steel brake disc were examined based on TM-I-type reduced-scale inertial braking dynamometer. The brake disc surface temperature was recorded by infrared thermal camera during braking. Findings Experimental results indicate that the thermal wear resistance of three friction materials differs with mental content, resulting in the deviation of pad-disc system contact state during braking, thus forming different temperature distribution on the brake disc surface. The peak temperature on the disc face of RM (190°C) is 36.6% and 45.4% lower than that of PM (300°C) and SM (348°C) at 160 km/h. The maximum radial temperature deviation of PM (35°C) is approximately three times than that of RM (12°C) and 40% higher than that of SM (25°C) at 50 km/h, whereas the maximum temperature deviation of SM (97°C) is six times than that of RM (16°C) and 31% higher than that of PM (74°C) at 160 km/h. Originality/value The effect of friction material type on the disc surface temperature distribution is revealed, which provides a meaningful reference for the design of brake friction pairs and choice of brake pad materials.

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Effect of Surface Modification on the Tribological Properties of Friction Blocks in High-Speed Train Brake Systems

Cited by 25 publications

References 50 publications

Influence of contacting shape of partial wear on friction properties of copper-based materials for trains

Influence of contacting shape of partial wear on friction properties of copper-based materials for trains

Modeling, testing and validation of the vibrational behavior of a dynamometric test rig for railway braking systems

Braking-experimental study on the relationship between friction material type and brake disc temperature

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