Thermal-mechanical Coupling Fatigue Analysis of High-speed Train Axle-mounted Brake Disc under Wheel-rail Excitation

doi:10.3901/JME.2024.04.409

Abstract

Abstract: A high-speed train brake disc dynamics model and a three-dimensional transient thermal mechanical finite element interaction model are developed to investigate dynamic effect of wheel vibration on the fatigue of the thermal-mechanical couplings of brake discs mounted on high-speed rails. The results show that the vibration acceleration value of the brake disc of high-speed train is the maximum in vertical direction and the minimum in transverse direction, and the vibration form is mainly brake jitter, and the jitter is the most severe in the range of 0-100 Hz; In comparison, the surface temperature of the brake disc attached to the shaft increases rapidly with the rail and decreases rapidly with temperature; The surface of the brake disc usually shows three hot circles;And the surface of the brake disc is located in the middle of the friction circle, the temperature is higher than the temperature on both sides, the temperature shows the gradient distribution of the three different friction differences. Brake disc surface fatigue damage and fatigue life distribution cloud diagram with and without wheel track tension basically corresponds to the distribution of the brake disc surface temperature field, the higher the thermal stress, the more serious the fatigue damage increase. The fatigue life of the brake disc surface is shortened.

Key words: wheel-rail excitation, vibration, thermo-mechanical coupling, brake disc, thermal fatigue damage

CLC Number:

U270

ZHU Haiyan, LI Jie, XIAO Qian, CHEN Daoyun. Thermal-mechanical Coupling Fatigue Analysis of High-speed Train Axle-mounted Brake Disc under Wheel-rail Excitation[J]. Journal of Mechanical Engineering, 2024, 60(4): 409-419.

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