Effect of the steel fiber length on the friction performance and wear mechanism of railway brake shoes

Monreal-Pérez, Pablo; González, Jesús; Iraizoz, Alicia; Bilbao, Unai; Clavería, Isabel

doi:10.1016/j.triboint.2022.107589

Cited by 8 publications

(5 citation statements)

References 32 publications

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“…[20] for wear. Other studies focus on single ingredients of the brake block [21,22], or on the behaviour under different weather conditions [23].…”

Section: Friction Behaviourmentioning

confidence: 99%

Braking distance prediction for vehicle consist in low-speed on-sight operation: a Monte Carlo approach

Pfaff

2023

Rail. Eng. Science

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The first and last mile of a railway journey, in both freight and transit applications, constitutes a high effort and is either non-productive (e.g. in the case of depot operations) or highly inefficient (e.g. in industrial railways). These parts are typically managed on-sight, i.e. with no signalling and train protection systems ensuring the freedom of movement. This is possible due to the rather short braking distances of individual vehicles and shunting consists. The present article analyses the braking behaviour of such shunting units. For this purpose, a dedicated model is developed. It is calibrated on published results of brake tests and validated against a high-definition model for low-speed applications. Based on this model, multiple simulations are executed to obtain a Monte Carlo simulation of the resulting braking distances. Based on the distribution properties and established safety levels, the risk of exceeding certain braking distances is evaluated and maximum braking distances are derived. Together with certain parameters of the system, these can serve in the design and safety assessment of driver assistance systems and automation of these processes.

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“…[20] for wear. Other studies focus on single ingredients of the brake block [21,22], or on the behaviour under different weather conditions [23].…”

Section: Friction Behaviourmentioning

confidence: 99%

Braking distance prediction for vehicle consist in low-speed on-sight operation: a Monte Carlo approach

Pfaff

2023

Rail. Eng. Science

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“… axisymmetric (two-dimensional) model marked 2D, in which imperfect thermal contact of the brake block and wheel was assumed, where the heat partition ratio was determined on the basis of the Charron formula (7), and the density of the frictional heat flux penetrating the wheel was determined taking into account the degree of cover equal to 0.364 (ratio of the wheel-brake blocks contact area to the area of the part of the wheel tread where contact with the brake blocks occurs);…”

Section: Boundary Conditions On the Contact Surface Of The Brake Bloc...mentioning

confidence: 99%

“…Regulations in the European Union concerning the reduction of noise levels [3,4] forced the more and more intensive replacement of cast iron brake blocks with organic composites. That change of the friction material type, and thus also the tribological characteristics of the friction node, which is the braking system of a rail vehicle, created a field for further research [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Yevtushenko

Kuciej

Grześ

et al. 2022

Preprint

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The article describes two numerical FEM models of frictional heating to estimate the temperature distribution in the 2xBgu friction brake of a rail vehicle during repetitive braking. The numerical tests were compared with the temperature measurements carried out on a full-scale inertia dynamometer for two different friction materials of brake blocks working in the 2xBgu system. The paper demonstrates, by comparison with experimental data, that the proposed numerical models can be used as a tool supporting engineering works to determine the temperature of friction elements of a railway block brake, also for long-lasting braking processes.

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“…In recent years, natural and synthetic fibers such as plant fiber [7,8], animal fiber [9], mineral fiber [10], glass fiber [11,12], carbon fiber [13], metal fiber [14,15], etc., have been added into composites to explore their effects on tribological properties. Among them, wood fiber has been widely used in the field of composite materials for the advantages of being a common source, its simple preparation, and its low price.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hybrid Rockwool–Wood Fiber on the Performance of Asbestos-Free Brake Friction Composites

2023

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The present study explores the physical-mechanical and tribological properties of hybrid wood fiber and rockwool-reinforced asbestos-free resin-based friction materials. We developed asbestos-free brake friction composites with different contents of hybrid fiber (wood and rockwool fiber) at a total fixed fiber loading of 30%. Then, the developed composites were investigated on the physical, mechanical, and tribological properties according to the industry standards. The results show that, with the increase in wood fiber, the density, hardness, and strength decrease, and the water absorption increases. Meanwhile, rockwool fiber can improve the coefficient of friction and enhance friction stability, while wood fiber has a significant impact on wear resistance. The sample with 5% wood fiber and 25% rockwool fiber presented the best performance in terms of the coefficients of friction, wear rate, and fade–recovery behavior. It provides a new idea for the research of asbestos-free composites.

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Effect of the steel fiber length on the friction performance and wear mechanism of railway brake shoes

Cited by 8 publications

References 32 publications

Braking distance prediction for vehicle consist in low-speed on-sight operation: a Monte Carlo approach

Braking distance prediction for vehicle consist in low-speed on-sight operation: a Monte Carlo approach

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Effects of Hybrid Rockwool–Wood Fiber on the Performance of Asbestos-Free Brake Friction Composites

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