Analysis Of Wear Life And Fatigue Of Wheels Of High-speed Train

Railway has entered a stage of rapid development in our country.Increase of train speed and carrying capacity leads that the wheel wear and fatigue problems become increasingly prominent.Wheel of serious wear which leads that the tread is not smooth will affect the stability and comfort of the train;Wheel fatigue damage can cause the wheel broken and major accidents,so we need to repair the wheel or replacement in time.But to establish the optimal repair or replacement cycle,it needs to clearly understand the rule of the wheel wear and fatigue damage when the train runs.These are the important purpose and significance of this paper.Emu model was built based on the dynamics software SIMPACK to obtain the creep force?the contact spot size and normal force parameters and so on in the contact spot by simulation analysis.Then combine Archard wear model and Shakedown diagram?figure damage function to establish the numerical analysis method of wheel wear and fatigue damage.Respectively analyze the effect from the rail curve radius,vehicle speed,friction coefficient and other factors on the wheel wear and fatigue to put forward the suggestions of how to reduce the wheel wear and fatigue.Finally,according to the real operation condition of the train,the time-varying law of wheel wear and fatigue damage is studied with running mileage,the fatigue life of the train being obtained.The main conclusions are as follows:(1)The rail curve radius is bigger,the number of wheel wear and fatigue index being smaller;The speed is faster,the wheel wear and fatigue damage value being bigger;The greater the amount of cant deficiency,the wear number is increasing trend after decreases first,and fatigue damage index has increased;Wheel wear and fatigue damage index increase with the increase of friction coefficient and value growth are bigger.(2)When rail curve radius is more than 7000 m,the abrasion of wheel will significantly reduce by continuation to increase curve radius,but slowly being stable;The wheel wear depth distribution is average when the speed under 280 km/h,but its amplitude will increase if the speed be faster;When the cant deficiency reaches 130 mm,there is the minimal abrasion damage of wheel compared with the maximum wheel wear depth when the friction coefficient is 0.3between wheel and track.(3)With the increase of running mileage,wheel abrasion scope,depth and total fatigue damage also increase.When trains run 200000 kilometers,the wheel wear ranges from-30 mm to 25 mm,wear depth being about 2 mm,and abrasion of the part close to the wheel flange is more serious;The position distance from wheel rolling round about 15 mm most probably first occurs the rolling contact fatigue with its fatigue life mileage of 200000 kilometers.Calculationresults are in conformity with the actual research.