Analysis Of Temperature Field &thermal Stress Field For Type CRH2 Emu Based On ANSYS

In recent years,the railway network has become increasingly developed,the proportion of high-speed trains is increasing,the train speed to become normal,but with the train speed increases,the train brake requirements also increased accordingly.From the point of view of the functional aspects of the component,the brake disc is the core component of the train brake,which plays a fundamental role in the conventional braking and emergency braking of the train.However,the development speed of the brake disc is relatively slow and even affected The world's high-speed train to further speed.In terms of China's situation,the EMU as the representative of the high-speed train series,the conventional speed of up to 200 km / h,but the domestic brake disc can not provide adequate security in the design time to slow down or stop the train,Inner years have to import brake discs from abroad,which has become China's high-speed train behind the rapid development of embarrassment.The braking problem of high-speed train involves many problems such as thermodynamics,dynamics,tribology,engineering mechanics,materials science and so on.It is a complex process of comprehensive action.The main focus of domestic research is through numerical simulation + The failure analysis or the fracture analysis of the brake disc is carried out,and it is learned that the thermal fatigue damage of the hot spot occurs in the brake disc under the working condition.According to previous research results,high-speed train began to brake,brake disc into the working state,in a relatively short period of time to accumulate heat,and these heat is difficult to quickly spread,making the disk temperature increases rapidly,the surge of thermal stress led to brake disc Failure,limiting the braking effect.In this study,a three-dimensional model of high-speed train axle plate with a speed of 200 km is established based on ANSYS.The influence of load variation is analyzed,and the thermal force of the shaft disk at different times is simulated.Field and temperature field changes.The analysis confirms that when the high-speed train is in emergency braking,the temperature on the friction ring of the brake disc reaches a maximum of 183° C on the 16.3st day after braking,and the friction ring temperature always represents the maximum temperature of the shaft disk.The shape of the disk surface hot spot changes in the process is from the band to the development of a group of hot classes,and then began to spread to the surrounding;generally also in the first 11.5s after braking,in the brake disc inside the ribs position,also appeared the largest Thermal stress,the value of 271 MPa,at the same time,the axial disk of the stress value has been higher than the other direction of the stress size,it can be determined,with a heat dissipation disk forged steel brake disc overall performance is superior,the basic fit In the speed of 200 km high-speed train braking system.At the end of this paper,the paper also puts forward some suggestions on the further study of the brake disc.