Abstract
A spatial computational model of a motor vehicle disc brake, based on the system of equations of heat dynamics of friction and wear (HDFW), was developed. The interrelations of temperature-dependent coefficient of friction and coefficient of intensity of wear through the contact temperature and vehicle velocity were taken into account. The solution of the system of equations of HDFW was obtained by the finite element method (FEM) for six different brake pad materials associated with the cast-iron disc during a single braking. Changes in the braking time, coefficient of friction, braking torque, vehicle velocity, mean temperature of the contact area of the pads with the disc and wear of the friction surfaces were determined. Then, the obtained calculation results were evaluated in terms of stabilization of the coefficient of friction (braking torque), as well as minimization of the maximum temperature, wear, braking time and pads mass. As a result, recommendations were given to select optimum brake pad material in combination with a cast-iron disc.
Highlights
The main function of a braking system is to reduce velocity, stopping or preventing movement of a vehicle
The aim of the present study was to develop a methodology for the initial material selection for brake pads based on temperature mode data
The basis for calculations was the coupled spatial system of equations of heat dynamics of friction and wear (HDFW) taking into account the thermal sensitivity of the coefficients of friction and the intensity of thermomechanical mass wear
Summary
The main function of a braking system is to reduce velocity, stopping or preventing movement of a vehicle. It is necessary to have experimental data on the friction stability of the considered pairs of materials—the dependence of their coefficients of friction and the intensity of wear on temperature They are the basis for the calculation model of the maximum brake temperature using the finite element method and the system of equations of heat dynamics of friction and wear (HDFW) [14,15]. Relative braking efficiency βe f f = αe f f /Il,max , where Il,max is maximum value of linear wear Il These parameters allow the operation of a given pair of materials to be evaluated in terms of meeting all indexes for friction and wear, including the requirement of stability of braking torque and smoothness of the braking process itself. The calculations were conducted for six brake pad materials associated with the cast-iron disc
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