Influence of braking speed on the wear property and simulation analysis of high-speed railway braking materials at low temperature

What is it about?

Friction brake tester was used to simulate the wear test of high-speed railway braking materials at diverse braking speeds (2100, 2400, 2700, 3000 rad/min) at -20 °C, and the stress and temperature analyses of brake disc friction surface were carried out by COMSOL. The results show that at -20 °C, with the rising of braking speed, the graphite particles on the friction surface of brake pad significantly reduce. And scratches and cracks are formed on brake pad friction surface. Besides, the abrasive wear, adhesive wear, and thermal cracks of brake disc friction surface are aggravated. Moreover, the maximal worn depth also increase. Meanwhile, the highest temperature and the maximum thermal stress of brake disc friction surface both raise. Furthermore, the temperature and thermal stress gradients at radial direction of brake disc friction surface aggrandize, which makes the thermal cracks on brake disc friction surface further exacerbated.

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