Numerical Simulation Of Brake Discs Of High-Speed Trains Based On ANSYS

Along with the rapid development of the high speed train, the speed is getting higher and higher, which bring a big problem to brake. No matter the routine braking or the emergency braking, the brake disc plays a key role, especially when emergency braking, it is the only way to brake the train by the friction of the brake disc, so the development becomes the bottleneck of increasing the speed. So far, the brake discs made in China can hardly satisfy the requirement of the high speed whose speed is 300 km/h or higher, and the brake discs are mostly imported from abroad, many researchers are engaging in the brake disc of high speed train now, and the work carried out based on this.Brake is a complex course, which includes tribology, thermodynamics, dynamics, material science and the interaction of many factors. The researchers at home and abroad paid much attention to fracture analysis and failure analysis, then analyzed the fatigue damage, and the method is generally numerical simulation combined with bench test. The present research results tell us that it produces much heat in the course of braking which leads to the temperature of the surface becomes high.The shaft disc of the high speed train with a speed of 300km/h was chosen as the research object, the course of emergency brake was simulated by large universal finite element software ANSYS. A 3D model was established, the way of applying loads were discussed, and the temperature field and thermal stress field were obtained. The result shows that the highest temperature appears at about 60s since braking and the value is about 329.6°C, the high temperature region is always in the friction ring, at first zonal and afterward high temperature cloddy hot spot diffusioning incessantly peripherad; the biggest stress is about 311MPa, appearing at about 47s since braking, the regions distribute at the surface corresponding with the radiating ribs, and near the inner diameter. The hoop stress is larger than other directions. The result shows that this kind of structure and material can satisfy the requirement of the shaft disc of the high speed train with a speed at 300km/h.At last, the way to increase the calculation accuracy and some advices about researching the brake disc of high speed train were proposed.