Optimum Thermal material Analysis of Train Ventilated Disk Brake
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Date
2016-08
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Addis Ababa University
Abstract
The brake disk is an important component in the braking system, which is expected to withstand
and dissipate the heat generated during the braking event. Hence, stresses arising from thermal
effects are much higher than mechanical stresses and are more likely to give concerns over the
disk integrity. In the present work, an attempt has been made to investigate the most acceptable
material, which has better performance. In order for this to be achieved, the brake rotor must be
designed such that it ensures sufficient uniform heat dissipation and thermal capacity. In highdemand
braking applications, vented disks consisting of two rubbing surfaces separated by
straight radial vanes are normally employed, as they utilize a greater surface area to dissipate
heat. Within this paper, the heat transfer coefficient has been determined using ANSYS CFX.
Also, thermo elastic instability (TIE) phenomenon (the unstable growth of contact pressure
and temperature) is investigated in the present study, and the influence of the material
properties on the thermo elastic behaviors (the maximum temperature on the friction
surfaces) is investigated to facilitate the conceptual design of the disk brake system. Based on
these numerical results, the thermo elastic behaviors of the four brake materials are discussed and
ALMMC with excellent mechanical and thermal properties is selected for design purpose.
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Keywords
Disk Brake, Train Ventilated Disk Brake, Thermal material, ALMMC