DETERMINATION OF THE BRAKING CHARACTERISTICS IN CASE OF THE VARIATION DEPENDING ON THE TEMPERATURE OF THE MATERIAL PROPERTIES OF THE FRICTION COUPLING OF THE DISC BRAKE OF RAILWAY VEHICLES

Liviu Sevastian BOCÎI, Jacob Javier VÁSQUEZ SANJUÁN

Abstract


The safety of classic and high-speed rail vehicles depends on the mode of operation and the characteristics of their braking systems. Braking of railway vehicles (especially stopping braking) can be performed using brakes of the same system (for example, shoe brake or disc brake of the mechanical braking system) or by combining brakes of several systems (disc brake - mechanical braking system). mechanical, electromagnetic rail brake or resistive or regenerative electric brake - electric braking system). During stop braking, the friction elements of the main brake - the disc brake - reach quite high temperatures (especially when braking at high speeds: V > 160 km/h) which leads to the alteration of the physical- chemical and mechanical properties of the materials of these elements.
This work presents the braking characteristics of railway vehicles (friction coefficient, braking space and deceleration when braking) in case of variation of the physical properties (specific heat and thermal conductivity) of the materials of the friction coupling elements of the railway. disc brake (friction pad and brake disc) as a function of temperature.


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