Study on Reliability Fatigue Life of Zhuan 8A Type Side Frame of Railway Freight Car Bogie

This paper introduces a method of reliability fatigue life instead of static intensity divided by safety coefficient to ensure enough intensity,the method can accurately compute the actual service life of side frame,and can find the location of fatigue weakness,and can provide advices to design side frame.Firstly,the multi-body system dynamic model of freight car was established to gain the load-time history of side frame.Then the multi-segment S-N curve was built though material ZG230-450 fatigue test data.The stress result of unit load was gained though finite element model of side frame.Finally the reliability fatigue life of side frame was simulated by Palmgren-Miner linear accumulating damage rules.The results of computing and test were consistent.