Abstract
Electric multiple unit is a modern transportation tool with high efficiency and large carrying capacity. Regarding its high speed, reliability requirement of the train is very important. As the main load bearing component of a train, the wheel is subjected to harsh working condition. Rolling contact between wheel and rail leads to wheel fatigue failure so that the fatigue reliability of wheel becomes one of the most attractive fields in electric multiple unit reliability study. This article proposed a fatigue reliability assessment method. It could obtain critical parts’ stress distribution efficiently through the force–stress relationship received by numerical simulation, so that it could assess wheel fatigue reliability under measured force–time spectrum. Also, multiaxial fatigue is considered in the method and the equivalent stress can be obtained by multiaxial model and fatigue experiment. Result of the case study shows that fatigue reliability of China Railway High-speed 5 wheel at 60,000 km mileage is 68%.
Highlights
China Railway High-speed (CRH) is the world largest high-speed railway system
China Railway High-speed 5 (CRH5) electric multiple unit (EMU) is a low-temperature-type train which is used in Northeast China where the lowest temperature is below 240°C
The design life of CRH5 wheel is more than 600,000 km; according to the results from Table 6, with 50% confidence, the reliability of wheel corresponding to 280,000 km mileage is only 12.2%
Summary
China Railway High-speed (CRH) is the world largest high-speed railway system. Founded in 2002, China has the longest operation length of high-speed railway, which is about 20,000 km around the world.[1] China Railway High-speed 5 (CRH5) electric multiple unit (EMU) is a low-temperature-type train which is used in Northeast China where the lowest temperature is below 240°C. As part of train, is more likely to fail compared to other parts of the train due to its harsh working environment. Under heavy-load, highspeed, and low-temperature conditions, if the reliability of the wheel is sufficient to guarantee safety operation is questionable. Zhao[7] evaluated the fatigue reliability of axles of Chinese railway vehicles through stress–strength interference theory. No matter which method is used, stress and strength distributions of the critical part are indispensable
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