Interface Pressure Distributions Through Structural Modifications

Abstract

Due to the friction forces acting at the rotor and pads interface, the pressure distribution at the interface is asymmetric in a disc brake system of normal floatingtype caliper design. The asymmetry and the high unevenness of the interface pressure distribution cause uneven wear and shorten life of pads. It has been speculated that these undesirable features promote disc brake squeal. This paper investigates the contact (interface) pressure distributions at the rotor and piston-pad interface in response to several ideas of simulated structural (geometric or material) modifications. These modifications are made on the pads and/or at the interface between the piston and the back plate or at the pad guide. A detailed finite element model is constructed taking into account all significant contact interfaces between disc brake components. Sliding frictional contact is analyzed to obtain the interface pressure distributions. A plausible modification is identified which offers improved interface pressure distributions against wear. This work may also help create a good design of disc brakes for improved noise performance as well.

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

“…It is found that contact pressure distribution is almost identical in all three cases and its value increases with an increase in the angular velocity of the disc. This was also confirmed by Abu Bakar, Ouyang, and Cao (2003). It is believed that this increase can create the wear of the pads as they can leave deposits on the disc, giving rise to what is called "the third body".…”

Brake squeal: Linear and nonlinear numerical approaches

“…In particular, the stabilization of the system vibrations at the limit cycle obtained by the experimental analysis [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] is predicted here by introducing contact nonlinearities in the numerical model.…”

“…This method is still linear and cannot account for nonlinearities due to the disc rotation, instant contact stiffness, local detachment and local stick phenomena, materials nonlinearity, etc. Recent studies try to account for effects like disc rotation and non-uniform contact pressure distribution [16][17][18]. Usually this approach is a good indicator for potential squeal frequencies, but it gives a poor idea on the propensity of the single squeal instability.…”

The Design and Analysis of A Brake Disc of the Two Wheeler

“…Finally they met there requirement with optimal modification. By their results the authors was stated that the right connection between piston ring and back plate in the axial direction will give better pressure distribution so that optimal contact will be established [6].In a braking phase the different contact behavior will occur between the components like pad and disc rotor. The author has carried out a study on thermo-mechanical dry contact behavior.…”