3211 Brake Performance of Cast Iron Composite Brake Block Containing Carbon Nanotube Alumina Filters

2011 ◽  
Vol 2011.20 (0) ◽  
pp. 201-202
Author(s):  
Naoya FUJIWARA ◽  
Toru MIYAUCHI ◽  
Jun-ichi NAKAYAMA ◽  
Bunshi FUGETSU ◽  
Hiroyuki NISHIMURA
Keyword(s):  
Cast Iron ◽  
Carbon Nanotube ◽  
Brake Performance ◽  
Brake Block

Noise-related roughness of railway wheel treads-full-scale testing of brake blocks

2000 ◽  
Vol 214 (2) ◽  
pp. 63-77 ◽  
Author(s):  
M Petersson
Keyword(s):  
Cast Iron ◽  
Hot Spots ◽  
Testing Machine ◽  
Full Scale ◽  
Spatial Distributions ◽  
Material Transfer ◽  
Railway Wheel ◽  
Rolling Noise ◽  
Brake Block ◽  
Abrasive Property

Results from full-scale tread braking experiments on an inertia dynamometer (brake testing machine) are presented. Eighteen prototypes of brake blocks are investigated. Two braking characteristics relating to the influence of the blocks on the wheel tread are studied: generation of hot spots and generation of roughness (corrugation, waviness). Wheel tread temperatures are measured during braking using an infrared (IR) technique. The wheel roughness is measured after each brake cycle when the wheel has cooled down. A roughness indicator, RλCA, relates measured roughness to expected rolling noise as generated by the wheel in operation. A correlation between the spatial distributions of temperatures and roughnesses is normally found: stronger for cast iron blocks and composition blocks and weaker for sinter blocks. The cast iron blocks are found to produce high tread roughness levels, partly owing to material transfer from brake block to wheel tread. The composition blocks are found to result in lower roughness levels than the cast iron blocks. Finally, the sinter metal blocks are found to lead to the lowest roughness levels, a fact which is probably due to the abrasive property of these blocks. Friction coefficients during braking are also measured.

Influence of silicon carbide filters in cast iron composite brake blocks on brake performance and development of a production process

Wear ◽  
2009 ◽  
Vol 267 (5-8) ◽  
pp. 833-838 ◽  
Author(s):  
T. Miyauchi ◽  
T. Tsujimura ◽  
K. Handa ◽  
J. Nakayama ◽  
K. Shimuzu
Keyword(s):  
Silicon Carbide ◽  
Cast Iron ◽  
Production Process ◽  
Brake Performance

A STUDY ON THE FAILURE ANALYSIS OF CAST IRON BRAKE BLOCKS THAT ARE USED FOR RAILWAY APPLICATIONS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4535-4540
Author(s):  
CHANG-MIN SUH ◽  
BYUNG-WON HWANG ◽  
WOO-HO BAE
Keyword(s):  
Cast Iron ◽  
Hot Spots ◽  
Hot Spot ◽  
Frictional Heat ◽  
Failure Behavior ◽  
Surface Cracks ◽  
Element Analysis ◽  
Actual Application ◽  
The Matrix ◽  
Brake Block

In order to clarify the cracking and failure behavior of gray cast iron brake blocks that are used for the railway applications, macro- and micro observations regarding the cracks and the micro-structure of the used brake blocks were examined. Three brake blocks, which have different degrees of hot spots and cracking during the actual application, were selected for testing. In addition, a thermal-mechanical coupled finite element analysis (FEA) was applied to calculate the temperature and the stress field in the brake blocks during braking. As a result, it was observed that surface cracks were initiated at the hot spots and propagated into the matrix. From the observation of dispersed graphites close to the crack path, it can be said that the deterioration of materials due to the frictional heat of braking made it easy to initiate cracks at the hot spot. The hardness of the brake block was recommended to be under 85 by the Rockwell B scale in order to prevent hot spots and crack initiation. From the FEA, the procedure for the occurrence of hot spots and cracks was successfully simulated by assuming the surface roughness on the slid surface of the brake block.

Rail Vehicles Brake Components Test Bench Utilisation

2013 ◽  
Vol 486 ◽  
pp. 379-386 ◽  
Author(s):  
Juraj Gerlici ◽  
Tomáš Lack
Keyword(s):  
Cast Iron ◽  
Friction Coefficient ◽  
Test Bench ◽  
Rolling Contact ◽  
Friction Materials ◽  
Braking System ◽  
Rail Vehicles ◽  
Type K ◽  
Technical Solutions ◽  
Brake Block

Reduction of noise due to rolling contact of wheel and rail for fright cars is one of the principal tasks of the European railways to be solved. Experts of railways, industries and universities were engaged during the last about ten years to search for technical solutions. An important noise reduction of fright cars can be achieved by replacing the cast iron brake shoes by composite brake shoes. Doing that, two directions have been taken into consideration. This is due to the fact, that at that time most composite brake shoes were based on friction coefficients were far away from that ones of the cast iron brake shoes. Applying such friction materials on existing vehicles would have as a consequence the change of braking forces acting on the wheels. These types of brake shoes (K-block) show a friction coefficient which is higher than that one of cast iron. As a consequence the application of the silent composite brake blocks of type K affords the adaptation of the braking system of the vehicle, what is cost intensive. For these reason, the application of K-brake block was proposed for new built vehicles. For existing vehicles solutions having the same friction coefficient as the cast iron brake shoes were requested (LL-Brake doing in this way, the modification of the braking equipment of existing fright cars could be avoided.

scholarly journals Simulation of the Thermal Behavior of Cast Iron Brake Block during Braking Maneuvers

2021 ◽  
Vol 11 (11) ◽  
pp. 5010
Author(s):  
Aurelio Somà ◽  
Marco Aimar ◽  
Nicolò Zampieri
Keyword(s):  
Finite Element ◽  
Cast Iron ◽  
Thermal Behavior ◽  
Research Group ◽  
Operating Conditions ◽  
Fe Model ◽  
Ministry Of Education ◽  
Rail Vehicles ◽  
Brake Block ◽  
Current Operating

In recent years, the interest in monitoring the operating conditions of freight wagons has grown significantly to improve the safety of railway vehicles. The railway research group of the Politecnico di Torino has been working for years on the development of solutions to effectively monitor the operating conditions of passenger and freight rail vehicles. As part of the national Cluster ITS Italy 2020 project funded by Italian ministry of education, university and research (MIUR), the Politecnico di Torino has collected a considerable amount of data thanks to the wired and wireless prototypes developed. The data obtained are used in this paper for the validation and calibration of a finite element (FE) model that simulates the temperature variation of a cast iron brake block due to braking operations of an intermodal freight wagon. The developed model can be a useful tool to predict the temperature at the wheel–shoe interface as a function of the current operating conditions since a direct measurement is not easy to perform.

Temperatures at railway tread braking. Part 2: calibration and numerical examples

2007 ◽  
Vol 221 (4) ◽  
pp. 429-441 ◽  
Author(s):  
T Vernersson
Keyword(s):  
Experimental Data ◽  
Cast Iron ◽  
Composite Materials ◽  
Thermal Model ◽  
Companion Paper ◽  
Block Type ◽  
Numerical Examples ◽  
Brake Power ◽  
Heat Partitioning ◽  
Brake Block

Temperatures in wheels and brake blocks at railway tread braking are studied under brake rig conditions. Results from rig experiments are reported for drag braking at constant brake power for brake blocks made of cast iron and of sinter and composite materials. The influence of block configuration, brake power, and brake speed is studied. A thermal model of railway tread braking, developed in a companion paper, is calibrated using the experimental data. This model analyses wheel and block temperatures and also the partitioning of heat between wheel and block in the brake tests. Numerical examples indicate the influence of brake block type on temperatures and on wheel-block heat partitioning. The influence of rail chill is studied in a complementary paper.

Carbon Nanotube and Graphene Device Physics

2009 ◽  
Author(s):  
H.-S. Philip Wong ◽  
Deji Akinwande
Keyword(s):  
Carbon Nanotube ◽  
Device Physics

The Bursting of Small Cast-Iron Flywheels

1902 ◽  
Vol 53 (1362supp) ◽  
pp. 21824-21826
Author(s):  
Charles H. Benjamin
Keyword(s):  
Cast Iron
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