Strength Check Analysis of Axle Box and Bolted Joints of High-Speed Motor Trains

In order to simulate the matching relationship between split axle boxes and consider the influence of bolt preload on the axle box, every part of the axle box body is modeled by ANSYS. At the same time, in order to simulate the transmission of the lateral force, the false shaft and the false bearing are established to cooperate with the axle housing. The static strength and fatigue strength of the axle box and bolt couplings are analyzed under the calculated loads and operating conditions specified in the EN 13749-2005 "Railway Applications - Wheelsets and Bogies Regulations for Bogies - Frame Structure Requirements" standard. In the assessment of fatigue strength, since the fatigue curve of steel used in China's railways is not currently available, the Goodman-smith steel fatigue limit diagram provided by ORE B12/RP17 (82) is temporarily replaced with the three-direction stress state into a one-way stress state, in order to calculate the average stress and stress amplitude of the stress cycle. It can be seen from the calculation that the static strength and fatigue strength of the high-speed EMU axle box and bolt coupling meet the design requirements under the load specified in EN13749.