Review on Thermal Cracking Phenomenone in Brake Disc

Abstract

Abstract-Disc brake is one of the modern technology in the braking system. It converts the motion of the vehicle wheel into heat by using friction between disc rotor and pads in order to retard the vehicle's velocity. When sudden brakes are applied, friction between disc and pad tremendously increases due to which heat is generated in this system. Heat generated due to friction induces high-temperature regions over the disc. Because of localized heating of disc surface, a thermal gradient is developed over disc surface which may plastically deform the disc. Due to overheating, hotspots generation and thermal judders phenomenon occurring on the disc, failure of the disc is witnessed in the form of cracks over disc surface. This results in a decrement of braking efficiency and an overall drop in braking performance. This paper draws attention to selective issues regarding the failure of brakes due to overheating and methods to reduce such kind of failure.

Coupled Thermal Stress Analysis of Volvo Truck Disc Brake

“…e heat generated at the brake friction interface can be transferred to the brake rotor as well as the brake pads [3,5,26].…”

“…At the contacting surfaces of the brake system, heat flux is obtained by dividing the rate of thermal energy by the respective surface contact area for each component. Based on the uniform wear assumption, an imperfect thermal contact type was modelled [5]. e friction heat flux generated in the interface of the disc brake and pad can be expressed as…”

“…Heat dissipated at the rubbing surface of the rotor and brake pad creates a temperature gradient through the disc's thickness as well as compressive stresses on both sides of the disc. After releasing the brake, the outer surface is cooled and generates tensile stresses, resulting in surface cracks on the disc, thermal deformation, and degradation of the material of the pads [4,5].…”

“…Several scholars have been researching on disc brake thermomechanical coupling analyses. Deshpande et al [5] studied on the analysis of heat conduction in the disc brake system. Green's equation based on time and space was used to calculate heat generation at the contact interface.…”

Applicability investigation of alumina-titania based plasma spray coating on cast iron brake discs for battery electric vehicles

“…The basic principle of the automobile braking system is to convert the kinetic energy of the vehicle into thermal energy as output of brakeage. To stop the vehicle, friction is created between two mechanical components (brake disc-pad), giving rise to heat generated between those two components and reduction in kinetic energy of vehicle which decreases vehicle velocity [1][2][3]. Due to the increase temperature in the interface of disc brakes and pads, high melting point materials are preferred.…”