Abstract
The background and necessity of application of numerical simulation method in research on friction materials of automotive brake are analyzed. The numerical analysis methods of conversion of braking energy, distribution of friction heat, transfer of friction heat and thermal mechanical coupling, are discussed. The dynamic temperature field and thermal stress field of the same brake disc and two kinds of friction plates of different materials, which are the composite materials based on resin and the powder metallurgy based on copper, are simulated and analyzed respectively under emergency braking. The effect of friction materials’ performance on friction temperature and thermal stress distribution is obtained. The results show that the friction performance of composite materials based on resin is better than the powder metallurgy based on copper. The results are consistent with the experimental results. The numerical simulation methods proposed have a good predictive effect on the typical characteristics of friction materials in the process of braking, which provides effective references for preparation and optimization design of friction materials of brake.
Highlights
Through friction motion, the friction materials of brake can convert the kinetic energy and potential energy of vehicle into thermal energy, and make vehicle to be decelerated or parked
Property Parameters of Materials In this paper, ZG1Cr13 is selected as the material of brake disc; the composite materials based on resin is selected as the material of friction plate 1; the powder metallurgy based on copper is selected as the material of friction plate 2
Under emergency braking selected in this paper when the speed is 120 km/h, the temperature field and thermal stress field produced by the same brake disc and two kinds of friction plates of different materials are calculated respectively
Summary
The friction materials of brake can convert the kinetic energy and potential energy of vehicle into thermal energy, and make vehicle to be decelerated or parked. The braking process involves kinetics, thermodynamics, tribology, material science, etc., and the normal load, sliding speed, temperature and surface stress of friction materials all effect the braking performance. The traditional experimental methods, will cause a waste of both time and energy, and sometimes even make it difficult to obtain some characteristics information of friction materials in braking process, such as the friction materials’ parameters for stress, strain and temperature etc. In the high strength braking process, the temperature of brake’s friction materials will be rapidly increased, which can lead to a series of physical and chemical changes on the surface of friction materials. 1874-155X/15 eters of selected vehicle, the change regulation and coupling of dynamic temperature field and thermal stress field of brake’s friction materials are analyzed in the process of braking by using the method of numerical simulation. The changes of stress, strain and temperature are analyzed comparatively between two different friction materials, which provides theoretical reference for selection and optimal design of friction material
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