Innovative solution for test equipment for the experimental investigation of friction properties of brake components of brake systems

Kurčík, Pavol; Gerlici, Juraj; Lack, Tomáš; Suchánek, Andrej; Harušinec, Jozef

doi:10.1016/j.trpro.2019.07.107

Cited by 12 publications

(6 citation statements)

References 14 publications

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“…In this work, dry sliding friction on selected tool steels and their comparison of wear in contact with ZrO 2 and X46Cr13 bearing balls were investigated. There are many types of devices designed to measure the coefficient of friction and wear, often designed for a particular field of research such as brakes in the automotive industry [17,18]. In our case, the entire friction measurement was performed in the UMT TriboLab, where the main parameter was the load (30, 60, 90 N).…”

Section: Introductionmentioning

confidence: 99%

Dry Sliding Friction of Tool Steels and Their Comparison of Wear in Contact with ZrO2 and X46Cr13

et al. 2020

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Tool steels are used in stamping, shearing processes, and as cutting tools due to their good mechanical properties. During their working cycle, steels are subject to aggressive conditions such as heat stress, fatigue, and wear. In this paper, three tool steels, namely X153CrMoV12, X37CrMoV5-1, and X45NiCrMo4 were selected against two types of bearing balls, ZrO2 and X46Cr1. All measurements were performed on a UMT TriboLab universal tribometric instrument under dry conditions. The main objective of the experiment was to analyze and compare tool steel wear in contact with two kinds of bearing balls with a diameter of 4.76 mm. This evaluation is focused on the hardness, surface roughness, and microstructure of all samples and on the impact of the input parameters on the resulting wear. All three types of tool steels were measured in the basic annealed state and, subsequently, in the state after hardening and tempering. Experimental results show that tool steels, belonging to high strength steels, can successfully represent wear resistant steels. The content of carbide elements, their size, and shape in the microstructure play an important role in the friction process and subsequent wear. Three types of loads were used and compared in the experiments 30, 60, and 90 N. Increasing the load results in significant degradation of the material on the sample surface. Lastly, the impact of hardness and roughness of materials on wear has also been proven. If abrasive wear occurs in the friction process, there is a greater degree of wear than that of adhesive wear. This is due to less abrasive particles, which behave like a cutting wedge and are subject to subsequent deformation strengthening due to the load increase, which adversely affects the further friction process. Analysis of the results showed that the ZrO2 ceramic ball showed significantly better wear values when compared to the X46Cr13 stainless steel ball. It also improves the values of the coefficient of friction with respect to the type of wear that occurs when the experimental materials and counterparts are in contact.

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Section: Introductionmentioning

confidence: 99%

Dry Sliding Friction of Tool Steels and Their Comparison of Wear in Contact with ZrO2 and X46Cr13

et al. 2020

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“…It will be possible to detect the load distribution in the brake pad by means of the tensometric sensors and to verify the achieved results with the simulation computations. The intended tests will be performed on a special test stand at the authors’ workplace, which is equipped with corresponding sensors for the detection of needed outputs [ 36 , 37 , 38 , 39 , 40 ].…”

Section: Discussionmentioning

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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“…Over the years, the need to overcome these limitations has suggested the adoption of laboratory brake testing devices, which are superior in efficiency and control to vehicle testing, as they involve fewer variables and reduced testing and engineering resources [7]. Numerous test systems have been proposed and adopted in the automotive sector (but also in other sectors, for example, railways [8][9][10]), each distinguished by the test procedures, experimental setups, and samples they adopt [11]. Generally, testing machines can be categorized into three main types based on whether the experimental tests are conducted using a pin-on-disc (or block-on-ring) configuration [12][13][14][15][16], a brake dynamometer (also called inertia dynamometer) [17,18], or a roller chassis bench (also called chassis dynamometer) [6,19].…”

Section: Introductionmentioning

confidence: 99%

Design and Development of a Brake Test Bench for Formula SAE Race Cars

Vecchiato,

Negri,

Picci

et al. 2024

Machines

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The optimization of the brake systems is crucial for vehicle performance and safety of Formula SAE (FSAE) race cars. This study introduces a specialized brake test bench designed to enhance the understanding and testing of these systems. The bench integrates a rotating mechanical system mounting a brake disc-caliper group, which is driven by an electric motor, a pneumatic brake pedal assembly to simulate real braking conditions, and a comprehensive array of sensors that facilitate the measurement of critical parameters, such as rotation speed, braking torque, oil pressure, and disc temperature. Its structure, sensor integration, and control electronics are fully described, demonstrating the capability to replicate on-track scenarios in a controlled environment. The results underscore the utility of the bench in providing precise and consistent testing conditions essential for analyzing the efficiency, durability, and safety of the braking systems of FSAE race cars.

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Innovative solution for test equipment for the experimental investigation of friction properties of brake components of brake systems

Cited by 12 publications

References 14 publications

Dry Sliding Friction of Tool Steels and Their Comparison of Wear in Contact with ZrO2 and X46Cr13

Dry Sliding Friction of Tool Steels and Their Comparison of Wear in Contact with ZrO2 and X46Cr13

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

Design and Development of a Brake Test Bench for Formula SAE Race Cars

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