Optimum Thermal material Analysis of Train Ventilated Disk Brake

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Addis Ababa University


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.



Disk Brake, Train Ventilated Disk Brake, Thermal material, ALMMC