Disc Brake Interface Pressure Distributions

Abstract

The nature of the contact and pressure at the interface between thefriction material pad and the disc rotor of a 'spot'-type disc brake affects the performance of a brake in terms of torque, temperature distributions and wear. Interface contact and pressure distributions have been predicted for a particular design of floating caliper passenger car disc brake, using three-dimensional finite element analysis under static and dynamic brake actuation conditions. The influence of friction material compressibility, pad backplate thickness, co&cient of friction, caliper flexure, disc stiflness and actuating piston contact with the piston bore on the interface pressure distribution is examined. The eflect upon brake performance is discussed in terms of 'centre of pressure' and corresponding braking torque, and in terms of observed eflects such as temperature and wear distribution. The results confirm that in order to ensure consistent disc brake pe$ormance the interface pressure distribution should be carefully controlled by designing in mechanical rigidity, compliant friction materials and minimum compliance during brake operation.

Thermal and structural analysis of disc brake assembly during single stop braking event

“…The interface pressure distributions have been investigated by a number of people. Tirovic and Day (1991) studied the influence of component geometry, material properties and contact characteristics on the interface pressure distribution. They used a simple and nonvalidated, three-dimensional model of the disc brake.…”

“…They showed a sticking and shifting contact area in their results. Like Tirovic and Day (1991), validation of their model was not made, Ripin (1995) developed a simple, validated three-dimensional FE model of the pad, and applied rather simple piston and finger force onto the back plate interface in his analysis. He studied the contact pressure distribution at the disc/pad interface, where gap elements were used to represent contact effect.…”

Investigation of Stick-Slip Vibration in a Commercial Vehicle Brake Assembly

“…This was recognised by Tirovic, et al, 11 who created a design program that considered caliper loading during a range of braking scenarios and provided material necessary to the caliper only to provide structural integrity. This approach provided an appropriately robust structure but a light caliper with little redundant material.…”

Linear eigenvalue analysis of the disc‐brake squeal problem

“…the tangential plane). These Young's moduli may vary from element to element and are assumed to depend on the local pressures, which are determined through a non-linear, static contact analysis [20]. Other researchers, for example [12,13], used spring elements for this contact.…”