Equivalent Fatigue Stress Analysis of the Key Parts of Railway RD_2 Axle

摘要

Nonlinear dynamics model of the C_62 freight car was established firstly and the random load spectrum acted on the wheelset was obtained by the simulation of the freight car running on a typical line. Taking the cyclic constructive relation of LZ50 axle steel into account in the finite element analysis of the wheelset, the stress time histories of the key parts of the axle in some typical conditions were got. Furthermore, based on the stress spectrum analysis of the hazard sections of the axle, the probabilistic fatigue stress spectrums with given probability and confidence were obtained. Finally, combining with the linear cumulative damage rules, the stress distribution of RD_2 axle was investigated, which is fundamental for the further prediction of the fatigue life of axle.