scholarly journals Defining the Temperature Change of the Brake Disc

2018 ◽  
Vol 11 (3) ◽  
pp. 119-131
Author(s):  
M. Menyhártné Baracskai
Keyword(s):  
Thermal Analysis ◽  
Temperature Change ◽  
High Performance ◽  
Travel Speed ◽  
Brake Disc ◽  
Disc Brake ◽  
Radial Temperature ◽  
Braking System ◽  
Power Machine ◽  
Brake Discs

In the article the thermal analysis of the brake disc and separator disc of a high performance power machine will be presented. As example an agricultural vehicle with weight of 30000 kg and maximum travel speed of 40 km/h will be taken. At stopping the vehicle, the braking system located in the wheel body becomes activated. The traversing of the piston forces the brake discs to friction. Therefore significant amount of heat is generated, which needs to be derived from the system. The article presents the construction of the disc brake system. Providing boundary condition, the radial temperature change of the cooled part of the brake disc will be defined.

scholarly journals Modeling the Depth of Surface Cracks in Brake Disc

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3890
Author(s):  
Wojciech Sawczuk ◽  
Mateusz Jüngst ◽  
Dariusz Ulbrich ◽  
Jakub Kowalczyk
Keyword(s):  
Cast Iron ◽  
Crack Depth ◽  
Brake Disc ◽  
Disc Brake ◽  
Surface Cracks ◽  
Braking System ◽  
Brake Discs ◽  
Regression Functions ◽  
Metallic Object

The article presents the state of knowledge and research in the field of surface cracks occurring in disc braking systems of rail and car vehicles. The craze formed during the operation of vehicles is particularly dangerous and leads to breaking the disc into several pieces. It may lead to a loss of braking force and damage to the entire disc brake caliper. The main aim of the research is to identify surface cracks in brake discs made of cast iron and use experimental methods to estimate their depth. Research were conducted on the disc braking system developed by the authors. In examining the location and depth of cracks, the penetration method, ultrasound, as well as a special probe were used. This device measures the crack depth based on the electrical resistance between two points on the surface of the metallic object. The tests showed that the first microcracks on the brake discs appeared after 309 braking tests on the test stand. In addition, it was observed that the surface cracks length of the disc increased linearly to depth until they reached about 11.5–12 mm with corresponded to crack lengths in the range of 65–70 mm. However, determination of the regression functions presented in the article allows to estimate the depth of surface cracks up to 70 mm long on cast iron brake discs by measuring their length.

Experimental Study of Convective Heat Transfer in Standard and Cross-Drilled Brake Discs With Radial Vane and X-Lattice Cores

2018 ◽  
Author(s):  
Hongbin Yan ◽  
Shangsheng Feng ◽  
Wei-Tao Wu ◽  
Tian Jian Lu ◽  
Gongnan Xie
Keyword(s):  
Heat Transfer ◽  
Experimental Comparison ◽  
Brake Disc ◽  
Disc Brake ◽  
Cooling Performance ◽  
Flow And Heat Transfer ◽  
Brake Discs ◽  
Flow Through ◽  
The Cross ◽  
Transfer Mechanisms

To improve the cooling performance of disc brake systems, cross-drilled holes penetrating across the rubbing discs are separately introduced into a commercial radial vane brake disc (as reference) and a novel X-lattice cored brake disc. Prototype samples of both the reference and cross-drilled brake discs are fabricated. A rotating test rig is designed and constructed to characterize and compare the cooling performance of the brake discs with infrared thermography. Within the typical operating range of a vehicle, e.g., 200–1000 rpm, the experimental results show that the introduction of cross-drilled holes can substantially enhance brake disc cooling. For the radial vane brake disc, the overall Nusselt number is enhanced by 31%–44%; for the X-lattice cored brake disc, the cross-drilled holes only lead to 9%–18% enhancement. As the radial vane brake disc and the X-lattice cored brake disc with cross-drilled holes exhibit similar cooling performance, flow through the cross-drilled holes has a more prominent effect on the former than the latter. Corresponding fluid flow and heat transfer mechanisms underlying the enhanced heat transfer by cross-drilled holes and the different effects of cross-drilled holes on the two distinct brake discs are explored. The experimental comparison and the thermo-fluidic physics presented in this paper are beneficial for engineers to further improve disc brake cooling.

EVALUATION OF THE HOMOGENEITY OF THE WORKING SURFACE OF CAST IRON BRAKE DISCS

Tribologia ◽  
2017 ◽  
Vol 276 (6) ◽  
pp. 33-37
Author(s):  
Grzegorz KINAL ◽  
Marta PACZKOWSKA
Keyword(s):  
Cast Iron ◽  
Corrosive Wear ◽  
Point Of View ◽  
Brake Disc ◽  
Braking Performance ◽  
Brake Pads ◽  
Braking System ◽  
Brake Discs ◽  
The One ◽  
Friction Surfaces

This article deals with the one of the most important elements of modern braking systems, which is a brake disc. A brake disc is the one of more stressed parts of the braking system, and its quality and design largely determine the braking performance of the vehicle. The article describes the technology of manufacturing disc brake pads that is important from the point of view of the wear processes occurring between two friction surfaces: the brake disc and the brake pad lining. The research of the cast iron ventilated brake disc surface measured the values of the selected roughness parameters at this site. In the context of measurements, it was also determined to be able to maintain a certain value of selected geometric parameters at a given location for the group of brake discs tested of a specific type and manufactured by a particular manufacturer. The work was carried out in the aspect of the research to create a surface layer to protect the brake discs from the effects of corrosive wear.

Optimizing Proportions of Railway Brake Discs by Temperature Transients Evaluation

1988 ◽  
Vol 202 (2) ◽  
pp. 91-99 ◽  
Author(s):  
S Missori ◽  
A Sili
Keyword(s):  
Thermal Cycle ◽  
Brake Disc ◽  
Disc Brake ◽  
Simple Method ◽  
Brake Discs ◽  
Brake Application ◽  
Dimensional Parameters ◽  
Maximum Temperatures ◽  
Commercial Size

When evaluating the performances of railway brake discs, the ability to accumulate and spread heat to the air plays a major role, since wear of synthetic lining and disc deterioration are strongly dependent on maximum temperatures attained on the surface in contact with the friction pad. The energy developed during brake application gives rise to an increase of disc temperature, which can be correlated to braking power, braking sequences and durations and to disc features. Maximum temperatures are attained on the friction surface of the disc. Determination of the thermal cycle subsequent to brake application can be considered preliminary to the study of lining and disc wear. The present work proposes a simple method using finite difference numerical analysis to evaluate the efficiency of the brake disc in dissipating the heat, both on a constant speed and an up-to-stop brake application. The effect of the various dimensional parameters, such as number of ribs, disc thickness and ribs width, is considered with the aim of achieving a first rough optimization of the required size of disc brake. The results related to a commercial size disc brake are given.

scholarly journals FEA Analysis of coupled thermo-mechanical response of grey cast iron material used in brake discs

2019 ◽  
Vol 3 (36) ◽  
pp. 280-296
Author(s):  
Ali Belhocine ◽  
Asif Afzal
Keyword(s):  
Thermal Analysis ◽  
Mechanical Response ◽  
Numerical Procedure ◽  
Brake Disc ◽  
Structural Method ◽  
Thermomechanical Model ◽  
Brake Discs ◽  
The One ◽  
Von Mises ◽  
Transient Thermal

In this work, we will present numerical modeling using the ANSYS software adapted for finite element method, to follow the evolution of the global temperatures for the two types of brake discs, full and ventilated disc during a braking scenario. Also, the numerical simulation of the transient thermal analysis and the static structural one is performed here sequentially with the coupled thermo-structural method. A numerical procedure of calculation relies on important steps such that the CFD thermal analysis is well illustrated in 3D, showing the effects of heat distribution over the brake disc. This CFD analysis will help us in the calculation of the values of the thermal coefficients (h) that will be exploited in the 3D transient evolution of the brake disc temperatures. Three different brake disc materials were selected in this simulation and a comparative analysis of the results was conducted in order to derive the one with the best thermal behavior. Finally, the resolution of the coupled thermomechanical model allows us to visualize other important results of this research such as; the deformations, and the equivalent stresses of Von Mises of the disc, as well as the contact pressure of the brake pads. Following our analysis and the results we draw from it, we derive several conclusions. The choice will allow us to deliver the best suitable design of the brake rotor to ensure and guarantee the good braking performance of vehicles.

scholarly journals Dynamic analysis of three autoventilated disc brakes

2017 ◽  
Vol 37 (3) ◽  
pp. 102-114 ◽  
Author(s):  
Ricardo A. García-León ◽  
Eder Flórez-Solano
Keyword(s):  
Simulation Software ◽  
Maximum Temperature ◽  
Brake Disc ◽  
Mechanical Parts ◽  
Cooling Channels ◽  
Braking System ◽  
Disc Brakes ◽  
Brake Discs ◽  
Different Types ◽  
Kinetics Of

The braking system of a car must meet several requirements, among which safety is the most important. It is also composed of a set of mechanical parts such as springs, different types of materials (Metallic and Non Metallic), gases and liquids. The brakes must work safely and predictably in all circumstances, which means having a stable level of friction, in any condition of temperature, humidity and salinity of the environment. For a correct design and operation of brake discs, it is necessary to consider different aspects, such as geometry, type of material, mechanical strength, maximum temperature, thermal deformation, cracking resistance, among others. Therefore, the main objective of this work is to analyze the dynamics and kinetics of the brake system from the pedal as the beginning of mathematical calculations to simulate the behavior and Analysis of Finite Elements (FEA), with the help of SolidWorks Simulation Software. The results show that the third brake disc works best in relation to the other two discs in their different working conditions such as speed and displacement in braking, concluding that depending on the geometry of the brake and the cooling channels these systems can be optimized that are of great importance for the automotive industry.

scholarly journals Design, Development and FE Thermal Analysis of a Radially Grooved Brake Disc Developed through Direct Metal Laser Sintering

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1211 ◽  
Author(s):  
Gulam Sayeed Ahmed ◽  
Salem Algarni
Keyword(s):  
Thermal Analysis ◽  
Effective Means ◽  
Laser Sintering ◽  
Maximum Temperature ◽  
Brake Disc ◽  
Disc Brake ◽  
Direct Metal Laser Sintering ◽  
Design Modification ◽  
Disc Surface ◽  
Brake Performance

The present research work analyzed the effect of design modification with radial grooves on disc brake performance and its thermal behavior by using additive manufacturing based 3D printed material maraging steel. Temperature distribution across the disc surface was estimated with different boundary conditions such as rotor speed, braking pressure, and braking time. Design modification and number of radial grooves were decided based on existing dimensions. Radial grooves were incorporated on disc surface through Direct Metal Laser Sintering (DMLS) process to increase surface area for maximum heat dissipation and reduce the stresses induced during braking process. The radial grooves act as a cooling channels which provides an effective means of cooling the disc surface which is under severe condition of sudden fall and rise of temperatures during running conditions. ANSYS software is used for transient structural and thermal analysis to investigate the variations in temperatures profile across the disc with induced heat flux. FE based thermo-structural analysis was done to determine thermal strains induced in disc due to sudden temperature fluctuations. The maximum temperature and Von Mises stress in disc brake without grooves on disc surface were observed which can severely affect thermal fatigue and rupture brake disc surface. It was been observed by incorporating the radial grooves that the disc brake surface is thermally stable. Experimental results are in good agreement with FE thermal analysis. DMLS provides easy fabrication of disc brake with radial grooves and enhancement of disc brake performance at higher speeds and temperatures. Therefore, DMLS provides an effective means of implementing product development technology.

scholarly journals Structural and Thermal Analysis of Disc Brake With Drilled Holes Of Various Materials

2019 ◽  
Vol 8 (10) ◽  
pp. 2667-2671
Keyword(s):  
Thermal Analysis ◽  
Structural Analysis ◽  
Carbon Steel ◽  
Maximum Stress ◽  
Disc Brake ◽  
Mechanical And Thermal Properties ◽  
Heat Flow Rate ◽  
Braking System ◽  
Steel Material ◽  
Strain Stress

The design of braking system of a vehicles is very important in order to minimize the accidents and increase the life span of vehicle, with this motto, in this paper presented the structural analysis, fatigue analysis and thermal analysis of disc brake with drilled holes(DBDH) was done by considering various materials of DBDH such as carbon alloy, steel and carbon steel. The comparison of those materials is studied in various mechanical and thermal properties such as deformation, strain, stress, factor of safety, number cycles under cyclic loading and heat flux. Simulation studies were done in Ansys 14.5 version. It is observed that the heat flow rate is high in carbon alloy and low in carbon steel material of DBDH model. Maximum stress is observed in steel in structural analysis.

scholarly journals Structural and Thermal Analysis of Disc Brake with Slots

2020 ◽  
Vol 9 (3) ◽  
pp. 903-907
Keyword(s):  
Thermal Analysis ◽  
Structural Analysis ◽  
Carbon Steel ◽  
Maximum Stress ◽  
Disc Brake ◽  
Mechanical And Thermal Properties ◽  
Heat Flow Rate ◽  
Braking System ◽  
Steel Material ◽  
Strain Stress

The design of braking system of a vehicles is very important in order to minimize the accidents and increase the life span of vehicle, with this motto, in this paper presented the structural analysis, fatigue analysis and thermal analysis of disc brake with slots (DBS) is done by considering various materials of DBS such as carbon alloy, steel and carbon steel. The comparison of those materials is studied in various mechanical and thermal properties such as deformation, strain, stress, factor of safety, number cycles under cyclic loading and heat flux. Simulation studies were done in Ansys 14.5 version. It is observed that the heat flow rate is high in carbon alloy and low in carbon steel material of DBS model. Maximum stress is observed in steel in structural analysis.

scholarly journals Thermal Analysis of Disc Brake System

2021 ◽  
Vol 9 (8) ◽  
pp. 1819-1826
Author(s):  
Srushti Newase
Keyword(s):  
Thermal Analysis ◽  
Thermal Stresses ◽  
Disc Brake ◽  
Surface Cracking ◽  
Brake Pads ◽  
Braking System ◽  
Brake Rotor ◽  
Braking Process ◽  
The Right ◽  
Safety Systems

Abstract: Brakes are one of the most significant safety systems in an automobile. In the braking process, the rotor will be exposed to large stresses which result in surface cracking, overheating of brake fluid, seals and other components. Therefore one of the main tasks of the braking system is to reduce the surface temperature of the brake rotor. This can be achieved by choosing the right material which will undergo the least thermal stresses. In this project, thermal analysis for vented disc brake rotor of Mahindra Bolero’s done, for providing an efficient material for disc brake rotor and brake pads which can dissipate heat generated during braking at faster rate and also being structurally safe. Keywords: Braking system, Disc Brake Rotor, Thermal, Structural Analysis, CATIA V5, ANSYS WORKBENCH

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