The influence of chemical composition upon the hardness of brake shoes meant for rolling stock

Pascu, Liviu; Socalici, Ana; Popa, E; Crişan, Eugen

doi:10.1063/1.4912911

Cited by 6 publications

(12 citation statements)

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“…According to this theory, fractures appear when the maximum stress reaches the tensile strength of the material for simple stretching. This criterion is used for brittle materials [ 33 , 34 , 35 ].…”

Section: Investigation Of Stress Distribution Fields In the Brake Pad...mentioning

confidence: 99%

Study on the Strength of the Brake Pad of a Freight Wagon under Uneven Loading in Operation

Panchenko,

Gerlici,

Lovska

et al. 2024

Sensors

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The paper highlights the results of determining the strength of the brake pad of a freight wagon under uneven loading in operation. The main reasons for the uneven loading on the pad have been found. A mathematical tool for determining the strength of the pad unevenly loaded has been proposed. In the study, the pad is considered to be a rod system loaded with concentrated forces and bending moments. Sensors have been used in order to detect the load state of the brake pads. These sensors have been defined in the simulation software, and they have been placed on the working surface of the pad in the area of its interaction with the wheel. The operation of these sensors was simulated in the simulation software package. The results of the calculation have shown that the stresses in the pad are about 21.1 MPa; thus, they exceed the permissible values by 29%. Therefore, considering the uneven loading of the pad in operation, the strength of the pad is not ensured. To test the obtained results, the strength of the pad was determined using the finite element method. The Coulomb criterion was used for the calculation. It was found that the maximum stresses in the pad were about 19 MPa. These stresses were 21% higher than permissible values and occurred in the back of the pad. The study has proven that the uneven loading on the brake pad in operation can cause their destruction during braking. This may also cause traffic accidents with freight trains during their movement. The results of this study will contribute to the theoretical developments and recommendations aimed at improving the brake system of a freight wagon and rail traffic safety. It is considered that the tensometric sensors will be applied in future experimental tests for comparison and verification of the achieved results from the simulation computations.

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Section: Investigation Of Stress Distribution Fields In the Brake Pad...mentioning

confidence: 99%

Study on the Strength of the Brake Pad of a Freight Wagon under Uneven Loading in Operation

Panchenko,

Gerlici,

Lovska

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…In the case of passenger cars and limited-gauge locomotives, braking systems with shoes cast from cast iron or composite material are used [1], [2]. The brake shoes used for towed rolling stock are manufactured in accordance with specific procedures and current legislation [2], [3]; these pieces are cast from phosphorous cast iron (type P10), where phosphorus has values in the range of 0.8-1.55% [4].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the casting and solidification process of the brake shoes intended for rolling stock

Bucur,

Socalici,

Josan

et al. 2024

J. Phys.: Conf. Ser.

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The paper presents the results obtained from the simulation of the casting and solidification process of the phosphorous cast iron brake blocks intended for rolling stock. The simulation of the casting and solidification process was carried out using the SolidWorks and Altair inspire cast programs. A S1 type brake shoe was chosen for this process. The solidification of phosphorous cast iron brake blocks is influenced by a number of constructive and technological factors. The simulation allows analysis of technological characteristics of casting and solidification of the alloy. The solidification process influences the micro and macrostructure of the parts, their compactness, mechanical strength, dimensional accuracy and surface quality.

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“…The studies in [42,43] highlight the peculiarities of the operation of brake pads and specify the requirements of materials for their production. It is noted that they should have high strength and wear resistance to prevent the destruction of brake pads; moreover, they should have sufficient hardness to ensure minimal wear of the wheel during braking [44]. This can be achieved by a change in the brake-pad material.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel

Panchenko,

Gerlici,

Lovska

et al. 2024

Symmetry

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This article presents the results of a study focused on identifying the main causes of the asymmetric (clinodual) wear of composite brake pads on freight wagons. A new scientific approach to determining the clinodual wear of composite brake pads on freight wagons is proposed. It is established that the harmful abrasion of the pad occurs during the movement of the freight train due to an imperfection in the bogie-brake lever transmission. The causes of the non-normative frictional wear of composite brake pads were investigated. This kind of wear leads to the tilting and abutting of the upper end of the brake pads against the rotating wheel during train running. The results of geometric and kinetostatic studies of the “pad–wheel” tribotechnical pair are provided to establish the causes and consequences of the accelerated clinodual frictional wear of composite brake pads on pendulum suspension in the bogies of freight wagons. The conditions of rotation of the wheels during braking “for” and “against” the clockwise direction depending on the direction of the train are considered. A new approach to brake-pad-wear prediction depending on the mileage of wagons under operational conditions is proposed. The research conducted in this study contributes to the development of the mechanical parts of freight-wagon brakes, increasing the efficiency of brake operation and improving the safety of train traffic.

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The influence of chemical composition upon the hardness of brake shoes meant for rolling stock

Cited by 6 publications

References 0 publications

Study on the Strength of the Brake Pad of a Freight Wagon under Uneven Loading in Operation

Study on the Strength of the Brake Pad of a Freight Wagon under Uneven Loading in Operation

Simulation of the casting and solidification process of the brake shoes intended for rolling stock

Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel

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