Investigation of Friction Temperature in Railway Disc Brake

2012 ◽  
Vol 479-481 ◽  
pp. 202-206
Author(s):  
Wan Hua Nong ◽  
Fei Gao ◽  
Rong Fu ◽  
Xiao Ming Han
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Friction Pair ◽  
Brake Disc ◽  
Finite Element Software ◽  
Disc Surface ◽  
Friction Temperature ◽  
Steel Disc ◽  
Braking Force ◽  
Braking Process

The distribution of temperature on the rubbing surface is an important factor influencing the lifetime of a brake disc. With a copper-base sintered brake pad and a forge steel disc, up-to-brake experiments have been conducted on a full-scale test bench at a highest speed of 200 Km/h and a maximum braking force of 22.5 KN. The temperature distributions on brake disc surface have been acquired by an infrared thermal camera, and the contact pressure on the contact surface of the friction pair has been calculated by the finite element software ABAQUS. The results show that the area and thermal gradient of the hot bands increase with the increase of braking speed and braking force. The hot bands occur in priority at the radial location of r=200 mm and r=300 mm, and move radially in the braking process. The finite element modelling calculation indicates that the distribution of the contact pressure on the disc surface in radial direction is in a "U"-shape. The maximum contact pressure occur at the radial locations of r=200 mm and r=300 mm, and the minimum contact pressure occur in the vicinity of the mean radius of the disc. The conformity of contact pressure distributions with the practical temperature evolutions indicates that the non-uniform distribution of the contact pressure is the factor resulting in the appearance of hot bands on the disc surface.

Coupling Analysis of Frictional Heat under Control of Disc Brake Anti-Skid Brake System

2011 ◽  
Vol 199-200 ◽  
pp. 721-728
Author(s):  
Yi Bing Zhang ◽  
Ying Ying Zhang
Keyword(s):  
Thermal Stress ◽  
Friction Pair ◽  
Brake System ◽  
Frictional Heat ◽  
Brake Disc ◽  
Analysis Model ◽  
Element Analysis ◽  
Study Results ◽  
Friction Temperature ◽  
Braking Force

The nonlinearity of material properties at different temperatures and the manner of braking force applying on a brake system are two key factors to affect the coupling of temperature and thermal stress. Considering these two factors, a finite element analysis model of automobile brake disc and pad is established. By using the model, the dynamic frictional heat and thermal stress of braking friction pair could be simulated and the coupling characters of temperature and thermal stress on friction surfaces could be studied, where the braking force is constant or controlled by an anti-skid brake system(ABS). The study results shown that the friction temperature of brake disk rises in periodic and fluctuant tendency. The fluctuant increase of temperature will influence the character of braking. The increase of friction temperature between a brake disc and pad can decrease under the control of ABS, so the effect of thermo-mechanical coupling could be reduced.

scholarly journals A Study on the Contact Pressure and Thermo-Elastic Behavior of a Brake Disc-Pad by Infrared Images and Finite Element Analysis

2018 ◽  
Vol 8 (9) ◽  
pp. 1639 ◽  
Author(s):  
Byeong-Choon Goo
Keyword(s):  
Finite Element Analysis ◽  
Heat Flux ◽  
Finite Element ◽  
Contact Pressure ◽  
Radial Direction ◽  
Elastic Behavior ◽  
Brake Disc ◽  
Linear Quadratic ◽  
Element Analysis ◽  
Disc Surface

To understand the tribological characteristics of a frictional brake system, it is very important to measure the contact pressure between the brake disc and pads. But until now there have been no direct methods by which to measure the contact pressure. In this study, an attempt to indirectly estimate the contact pressure is proposed. Infrared thermal images and finite element analysis were used as tools. For the thermo-elastic finite element analysis, uniform, linear, quadratic, and quartic heat flux profiles in the radial direction were applied on the disc surface. Thermal and stress fields were obtained under various conditions in the disc fixing holes and on the contact faces of the two half discs. From the numerical results, it was found that the effect of the boundary conditions on the magnitude of thermal stress was about 10%. Numerical temperature data in the radial direction could be curve-fitted to functions with the same order as the heat flux profiles. The coefficients of correlation of the curve-fittings were more than 0.91. It could be concluded that using temperature profiles obtained with an infrared camera, contact pressure distributions on the disc surface could be inferred.

scholarly journals Impact of Brake Pad Structure on Temperature and Stress Fields of Brake Disc

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Guoshun Wang ◽  
Rong Fu
Keyword(s):  
Structure Factor ◽  
Friction Pair ◽  
Flow Distribution ◽  
Peak Temperature ◽  
Brake Disc ◽  
Brake Pad ◽  
Brake Pads ◽  
Finite Element Software ◽  
Circular Structure ◽  
Friction Energy

Utilizing ABAQUS finite element software, the study established the relationship between a brake pad structure and distributions of temperature and thermal stress on brake disc. By introducing radial structure factor and circular structure factor concepts, the research characterized the effect of friction block radial and circumferential arrangement on temperature field of the brake disc. A method was proposed for improving heat flow distribution of the brake disc through optimizing the position of the friction block of the brake pad. Structure optimization was conducted on brake pads composed of 5 or 7 circular friction blocks. The result shows that, with the same overall contact area of friction pair, an appropriate brake pad structure can make the friction energy distribute evenly and therefore lowers peak temperature and stress of the brake disc. Compared with a brake pad of 7 friction blocks, an optimized brake pad of 5 friction blocks lowered the peak temperature of the corresponding brake disc by 4.9% and reduced the highest stress by 10.7%.

Thermal Analysis of Two Wheeler Brake Disc Using ANSYS

2015 ◽  
Vol 787 ◽  
pp. 301-305
Author(s):  
V. Ganesh ◽  
T. Abinaya
Keyword(s):  
Thermal Analysis ◽  
Stainless Steel ◽  
Computer Software ◽  
Frictional Resistance ◽  
Brake Disc ◽  
Conventional System ◽  
Disc Surface ◽  
Braking Force ◽  
Transient Thermal ◽  
Two Wheeler

This paper deals with the transient thermal analysis of brake disc of Variable Braking Force (VBF) system using computer software ANSYS. Generally, brake system is designed to apply frictional resistance to stop the vehicle. In VBF system the frictional resistance applied to the brake disc can be varied by changing the effective disc radius based on the pillion load. The rotor disc is commonly manufactured using cast iron (CI) or stainless steel (SS). In this work, these materials are taken for analysing the temperature distribution of VBF system. In addition to, an effort has been made here to suggest the best suited material for brake disc. By the way, it is evident that the rise in disc surface temperature is higher for VBF system compared with conventional system (constant effective disc radius (r) = 110mm).

Review of the coatings used for brake discs regarding their wear resistance and environmental effect

2021 ◽  
pp. 135065012110706
Author(s):  
Saša Vasiljević ◽  
Jasna Glišović ◽  
Blaža Stojanović ◽  
Aleksandar Vencl
Keyword(s):  
Wear Rate ◽  
Friction Pair ◽  
Wear Intensity ◽  
Brake Disc ◽  
Disc Brakes ◽  
Brake Discs ◽  
Materials Used ◽  
Braking Process ◽  
Brake Rotors ◽  
Deposition Techniques

Wear of a friction pair of brake (brake disc and pads), in addition to reducing the active safety of vehicles, leads to the formation of particles that can affect the environment and human health. In addition to the technologies that are being developed for the collection of particles created by the wear of brakes during braking process, today new materials are being introduced, as well as various technologies for processing friction pairs with the aim of reducing brake wear and thus the formation of particles. Furthermore, today, technologies for coating (cladding) the friction surfaces of disc brakes with some materials are increasingly applied and researched, in order to reduce the wear intensity (wear rate) of disc brakes, i.e. the emission of particles created by wear of friction pairs. The aim of this paper is to analyse and review different deposition techniques and materials used for brake discs coatings, as well as the effect it has on the wear rate of friction pair. There are many coating deposition techniques, and special attention is paid to the technology of laser hardfacing of brake rotors.

Effect of the friction coefficient for contact pressure of packer rubber

2014 ◽  
Vol 228 (16) ◽  
pp. 2881-2887 ◽  
Author(s):  
Weiguo Ma ◽  
Baolong Qu ◽  
Feng Guan
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Design Of Experiments ◽  
Contact Pressure ◽  
Systematic Study ◽  
Valuable Insight ◽  
Finite Element Software ◽  
Rubber Friction ◽  
Maximum Contact ◽  
Insight Into

A systematic study of the packer rubber contact pressure under a fixed-displacement load is conducted to gain further insight into the packer seal mechanism. A Y221-114 double rubber packer is investigated using the finite element software ANSYS, where a design of experiments method is utilized to study the effects of the friction coefficient. The results show that the friction coefficient of the packer and the tubing had the greatest effect on contact pressure than other factors. Decreasing the rubber friction coefficient is conducive to forming the double rubber seal and increasing the maximum contact pressure working range. However, there is additionally a slight decrease in the value of maximum contact pressure. The results of the study provide valuable insight into the importance of packer design optimization.

3D Finite Element Approach to Simulate the Contact Pressure between Two Deformable Cylinders. Application to a Spur Gear

2018 ◽  
Vol 37 ◽  
pp. 1-12
Author(s):  
Mohamdi Djemoui ◽  
Outtas Toufik
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Experimental Methods ◽  
Spur Gear ◽  
Spur Gears ◽  
Hertz Theory ◽  
3D Finite Element ◽  
Deformable Solids ◽  
Finite Element Software ◽  
Element Approach

Knowing the stresses and pressures in the contact between two deformable solids is fundamental in order to optimize the strength and the lifetime of mechanical components such as bearings or gears. These constraints can be determined by the calculation (finite element method or Hertz theory) or by experimental methods such as photoelasticity. The objective of this study is to model and compute the stress field and contact pressure using 3D finite element software. The validation of obtained results is done by comparison with the classical results of the non linear Hertz theory between two deformable cylinders. An application to spur gears with a circle involute profile is done and also validate with the same Hertz theory.

Analysis of the Thermal-Structure Coupling of the Band Brake

2011 ◽  
Vol 121-126 ◽  
pp. 499-503
Author(s):  
Fu Cai Hu ◽  
Hu Lin Li ◽  
Bei Si Xie
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Stress Field ◽  
Failure Mechanism ◽  
Optimization Design ◽  
3D Model ◽  
Thermal Structure ◽  
Nonlinear Coupling ◽  
Finite Element Software ◽  
Braking Process

A 3D model of band brake is established with PRO/E software, and its thermal-structure nonlinear coupling is analyzed with finite element software MSC.Marc. Temperature field and stress field distribution of the brake band and the friction linings in braking process are calculated, and the failure mechanism of the connecting bolt is analyzed. All these provide references for optimization design.

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