Thermal and stress analyses of disc brakes under specific loads (driving downhill and braking to a standstill) was calculated. The FEM (Finite Element Method) was used to carry out the analysis. The analysis dealt with centrifugal load for two cases of braking, braking to a standstill on a flat surface and braking downhill, maintaining constant speed and afterwards braking to a standstill. The main boundary condition in both cases was the entered heat flux on the braking surface of the disc and the force of the brake clamps. Two different nodular cast iron (EN-GJS-500-7) discs were used, one brand new (unused) and one with permitted wearing (7 mm wear on each side). Concerning the given design of the discs, the material and the results of analyses of thermal and centrifugal loads, it can be claimed that the selected model of the disc brake is adequate and that the set target of the analysis meets the requirements of the disc brake makers' internal standards. However, the analysis has not considered the effects of shear stresses, residual stresses and the effect of service life with cyclic load, which the disc material must daily support without breaking down.
Modelling and analysis of thermal and stress loads in train disc brakes - braking from 250 km/h to standstill
Modellierung und Analyse thermischer und mechanischer Belastungen in Zug-Scheibenbremsen - Herunterbremsen von 250 km/h bis zum Stillstand
Strojniski vestnik - Journal of Mechanical Engineering ; 55 , 7/8 ; 494-502
2009
9 Seiten, 15 Bilder, 4 Tabellen, 12 Quellen
Article (Journal)
English
Scheibenbremsenbauteil , Mehrscheibenbremse , Eisenbahn , Gusseisen mit Kugelgraphit , Wärmebelastung , mechanische Beanspruchung , Spannungsanalyse , Finite-Elemente-Methode , Zentrifugalkraft , Bremskraft , Bremsscheibe , Bremsvorgang , Bremswirkung , Bremsweg , Wärmestromdichte , Randbedingung , thermomechanische Analyse
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