Safety Life Analysis of High Speed Maglev Running Mechanism Parts Based on Strength Degradation

The Shanghai high speed Maglev demonstration line has been in operation for 16 years and has entered the middle stage of design life. The tolerance capacity of external random collision damage is an important capability of mechanical parts of running mechanisms. The running mechanism of a Maglev system gradually produces fatigue damage under the condition of time history and cyclic load, which will reduce its ability of external random impact damage. Based on fatigue cumulative damage theory and fracture mechanics, the damage tolerance life of important parts of vehicles running mechanisms under degradation strength was studied. A stress-strength interference model under the degraded strength of important components was built, and the factors that affect the remaining life of a defective part under performance degradation was studied. The above research provided theoretical support for selecting the materials for the mechanical components of the running mechanism of Maglev system.