Analysis Of Crashworthiness Simulation Of High-Speed Train Bodies Based On Wheel/Rail And Welding Residual Stress Model

It would cause huge losses of casualties and property in the high-speed train collision accident. Passive safety design is the ultimate safeguard to protect the safety of passengers in an accident. Therefore, it is quite significant to research on simulation Analysis for crashworthiness of high-speed vehicle car-body.In this paper, the research object is the CRH380C high speed vehicle, I mainly finished the following works:(1) According to the manufacturing process and the forming technology of the high-speed train body. Analyze the welding process of local structure on side wall of high-speed vehicle car-body. Completed the welding process simulation of aluminum alloy profile based on the thermal mechanical coupling with double elliptical cylinder temperature source model. The temperature field and the residual stress field distribution of the welding on the side wall of vehicle car-body are analyzed. The distribution of welding residual stress on the side wall of high speed vehicle body was summarized, and the influence of welding restraint conditions on the distribution of residual stress in the welding of vehicle body was analyzed.(2) A bogie model for vehicle body collision analysis is established according to the existing geometric model, including the geometric model, the material model, contact definitions, connections, etc. Determined the relevant parameters of the bogie model are, the simulation analysis of the bogie model is realized, analyzed vertical response and wheel movement.(3) According to the EN 15227, the collision scene of the car body structure is established and the evaluation parameters are established. A head vehicle collision model is established, considering the bogie system and coupler system. The longitudinal response, lateral response and vertical response of high-speed trains are analyzed. Implicit-explicit sequential solution(4) Using implicit- explicit continuous solving method, high-speed train car body side wall welding residual import should be for collision analysis of finite element model for simulation analysis, considering the body welding residual stress of high-speed train collision process and does not consider the body welding residual stress of high speed vehicle collision process of the impact force, the body should be force and average acceleration factors. The welding residual stress of the car body, which makes the strength of the weld position and its nearby units decrease, changes the time that the material reaches the failure stress and influences the energy absorption time and form of each structure. Not considering welding residual stress is body state of the design process, is a kind of ideal state; considering car body welding residual stress is in the actual operation of body stress state, weakened the structure, reduce the impact force peak, duration of growth.