Study On Modeling And Simulation Of Crash Problems Of Single Railway Vehicle Based On ANSYS/LS-DYNA

The crash accident of train brought great damage to vehicles and property. Seriously, some passengers will be injured and lost their life in accident. So the passive safety of high-speed passenger vehicles is important and should be highly considered. With the development of computer technology and explicit finite element method, it is possible the numerical simulation of high-speed crash will be come true. The researches which are about the crash characteristics of high-speed crash with the large deformation will be practical and useful to improve the passive safety of high-speed passenger vehicles.Based on ANSYS/LS-DYNA, several classical crash processes of vehicles and the response of passengers with the second-crash have been simulated and analyzed.Firstly, according to the design drawing, the three-dimensional model of 200km/h aluminum alloy bodyshell has been set up with the software ANSYS and then it was meshed with the software Hyper Mesh. According to the selection of element types, material model and contact types and load, the finite element model has been finished.Secondly, the frontal crash on single vehicle with fixed rigid and movable rigid wall have been studied. The simulation data indicated that crash time was very short, very large plastic deformation had been produced in the head of bodyshell, little deformation had been produced in the middle, the kinetic energy was mainly absorbed by a few structures, the crash acceleration got max value at the crash location and became smaller from the front to the end of the vehicle, and the possibility of climbing has been analyzed.Furthermore, according to the simulation of different crash conditions, the result of vehicle crash had been analyzed under different initial velocities and material parameters. The conclusion shows that the more initial speed, the larger plastic deformation and the more EX, the less plastic deformation.In the end, the second-crash had been simulated by using the Hybrid III 95% dummy. Damage degree of the head and chest of the dummy has been analyzed and compared with the relative damage index.