Abstract
A three-dimensional numerical model of a disk brake to study temperature on a discrete contact of rough surfaces has been developed. It includes the system of equations formulated based on thermotribological postulates of heat dynamics of friction and wear with mutual influence of contact pressure, velocity, properties of materials, and temperature. Two approaches of calculation of the flash temperature and its influence on the maximum temperature during a single braking application were studied. Changes in the contact temperature, sliding velocity, and the thermomechanical wear during braking were shown and discussed. It was found that two of the examined variants of calculation of the flash temperature agree well for the three considered materials of the brake pads combined with the cast iron disk, at each initial sliding velocity in the range from 5 to 20 m s−1.
Highlights
Modeling of non-stationary processes of frictional heat generation with interdependent temperature, coefficient of friction, sliding velocity, contact pressure, and wear requires taking into account complex mathematical and physical aspects
Computer simulations of a single braking to study the flash temperature, found based on two Chichinadze’s methods, as well as mutual influence with the braking parameters, were carried out
The proposed spatial model of the disk brake is an extension of the axisymmetric 2D model using the first computational variant of the flash temperature (equations (33)–(40)).[16]
Summary
Modeling of non-stationary processes of frictional heat generation with interdependent temperature, coefficient of friction, sliding velocity, contact pressure, and wear requires taking into account complex mathematical and physical aspects. It is known that the calculation of flash temperature without taking into account the temperature dependence of the thermophysical and mechanical properties of materials leads to incorrect estimation of Tf , Tmax (equation (1)).[30] The values of thermal conductivity Kp, d, specific heat cp, d, and hardness HBp in formulas (33)–(40) were taken at the mean temperature Tm (equation (13)) of the area of contact and are determined from the solution of the boundary value problem (equations (14)–(32)).
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