Study On Strength Simulation And Dynamic Stress Test Of A Bogie Frame

With the rapid development of railway industry in China,higher requirements are put forward for the safety and comfort of trains.As an important part of the vehicle,bogie frame has a direct impact on the safety,stability and reliability of the train.This paper evaluates the static strength and fatigue strength of a bogie,and studies the dynamic stress test of the bogie and analyzes its fatigue life.The specific research work is as followsFirstly,the bogie was simulated and analyzed by finite element method.According to UIC515-4 Standard Test Method for structural strength of power bogie,the static strength and fatigue strength were evaluated respectively.The simulation results show that the static strength and fatigue strength of the bogie meet the requirements of use,the fatigue limit of the uncorrected weld in Goodman fatigue envelope should be paid full attention.Then,according to UIC515-4 standard and load test method of frame and bolster for railway vehicles(JIS E 4208),static strength and fatigue strength test were carried out for bogie.Static strength and fatigue strength of bogie were evaluated by static strength test and fatigue cyclic load loading.The test results show that the bogie meets the static strength and fatigue strength requirements in the standard under the operation test load and fatigue test load,and no crack occurs in magnetic particle inspection and ultrasonic inspection.Finally,the dynamic stress test and fatigue life evaluation of bogie were carried out.The fatigue weak parts were determined after testing the dynamic stress of bogie frame in the test route.The equivalent stress amplitude of each stress measuring point was calculated according to miner rule and S-N curve of welded joint.Finally,the fatigue life of bogie was evaluated.The results show that the weak fatigue parts meet the design requirements of 3.5 million km of safe application.After 3.5 million km of application,the fatigue strength of the joint between the frame gearbox seat and the beam and the connection of the small longitudinal beam and the beam has been close to the fatigue allowable stress,so attention should be paid to in the manufacturing and operation.