Ventilated disc brakes are widely used for reducing velocity due to their braking stability, controllability and ability to prove a wideranging brake torque. During braking, the kinetic energy and potential energies of a moving vehicle are converted into thermal energy through friction heating between the brake disc and the pads. The object of the present study is to investigate the temperature and thermal stress in the ventilated disc-pad brake during single brake. The brake disc is decelerated at the initial speed with constant acceleration, until the disc comes to a stop. The ventilated pad-disc brake assembly is built by a 3D model with a thermo-mechanical coupling boundary condition and multi-body model technique. To verify the simulation results, an experimental investigation is carried out.

Purpose – The purpose of this paper is to investigate and discuss the effect of multi-shape laser surface texturing (LST) steel surfaces on tribological performance. Design/methodology/approach – The textured surface with some specific formula arrays was fabricated by laser ablation process by combining patterns of circles and triangles, circles and squares and circles and ellipses. The tribological test was performed by a flat-on-flat tribometer under dry and lubrication conditions, and results were compared with that of untextured surface. Findings – The results showed that the textured surface had better friction coefficient performance than the untextured surface due to hydrodynamic lubrication effect. Through an increase in sliding speed, the beneficial effect of LST performance was achieved under dry and lubrication conditions. Originality/value – This paper develops multi-shape LST steel surfaces for improving the friction and wear performance under dry and lubrication conditions.

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Braking operation is a process that converts kinetic energy and potential energy of a moving automobile into other energies. Most of the mechanical energy is transferred into heat. Frictional heat, which is generated on the interface of the disc and pads, can cause high temperature during the braking process. The objective of the present work is to determine temperature distribution, thermal distortion, and thermal stress in a solid disc by three-dimensional modelling for repeated braking. Braking is applied four times in the present study; the vehicle is decelerated from 100 to 50 kph with 0.6 g, after which the velocity is again accelerated to 100 kph. In order to simulate the friction heat behaviour accurately in repeated braking, the moving heat source, which is defined by time and space variable, is applied on the frictional surface. The temperature field and thermal stress in the disc present a non-uniformity characteristic because of the moving heat source. Temperature and thermal stress of the point on the frictional surface of the brake disc present fluctuation in the braking operation. The coning angle due to the non-uniform radial temperature distribution varies with temperature. Thermal fatigue is also discussed in this article.

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