Effect of the reinforcing fibre in the friction material on the temperature in railway braking
AbstractIn the design process of braking systems installed in railway rolling stock, key problem is the operating temperature of the friction elements. In the case of railway tread brake it is a safety-relevant issue, as the wheel simultaneously constitutes friction pair and running gear. Excessive thermal load may lead to wheel fracture and consequently become the cause of a serious accident. Among other factors, formulation of the composite material used to manufacture the brake shoes has an effect on the temperature of the wheel in the course of brake application. In the current paper the results of a full-scale dynamometer test of two friction materials are presented. The composites’ formulations differed in the type of the reinforcing fibre – in one case it was glass fibre, in the other steel fibre. The remaining raw materials and their weight concentration as well as manufacturing technology were identical. The dynamometer test programme comprised stop brake applications in a wide range of operating conditions as well as drag brakings. The results of the tests were analysed to identify the effect of the reinforcing fibre on the heat conduction and wheel temperature evolution as well as frictional properties of the tested composites. The thermo-insulating properties of the glass fibre and high thermal conductivity of the steel fibre led to differences in the heat conduction process. The experimental part of the study was limited to one weight concentration of each type of the reinforcing fibre.
|Book||Proceedings of ICTS 2019, 2019, Zhejiang University, 390 p.|
|Keywords in English||Railway tread brake; Composite brake shoe; Friction material formulation; Full-scale dynamometer test|
|Internal identifier||ROC 19-20|
|Score||= 0.0, 19-12-2019, ChapterFromConference|
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