Abstract
Braking operation is a process which converts the kinetic energy and the potential energy of the vehicle into other energies. The major part of the mechanical energy is transformed into heat. During the braking phase, the frictional heat generated at the interface disc–pads can lead to high temperatures. This phenomenon is even more important that the tangential stress as well as the relative sliding speeds in contact are important. The objective of this study is to analyse the thermal behavior of the full and ventilated brake discs of the vehicles using computing code ANSYS. The modeling of the temperature distribution in the disc brake is used to identify all the factors and the entering parameters concerned at the time of the braking operation such as the type of braking, the geometric design of the disc and the used material. The results obtained by the numerical simulation are satisfactory compared with those of the specialized literature.
Highlights
The modeling of the problems involved in the phenomena of transfers in general and of thermals in particular is of primary importance, on the one hand, for the phase study or design of a product, and on the other hand, for the follow-up of the product in phase of operation
The brake discs are made of cast iron with high carbon content; the contact surface of the disc receives an entering heat flux calculated by the relation (5)
We presented a numerical simulation of the thermal behavior of a full and ventilated disc in transient state
Summary
The modeling of the problems involved in the phenomena of transfers in general and of thermals in particular is of primary importance, on the one hand, for the phase study or design of a product, and on the other hand, for the follow-up of the product in phase of operation. The thermal analysis of the braking system requires a precise determination of the quantity of heat friction produced and as well as the distribution of this energy between the disc and the brake lining. When a vehicle is braked, a part of the frictional heat escapes in the air ambient by convection and radiation. Since the process of heat transfer by radiation is not too important, we will determine using code ANSYS CFX only the convection coefficient (h) of the disc. This parameter will be exploited to determine the threedimensional distribution of the temperature of the disc
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