Automobile Frontal Crash Analysis Based On Hypermesh And LS-DYNA

Due to the rapid development of China's automobile manufacturing industry in recent years,car ownership in China increased promptly.The automobile brings the convenient life to people,the traffic accidents become more and more serious at the same time.According to statistics,frontal crash caused by traffic accidents in the first place in all types of car crash.Therefore,How to reduce the damage caused by frontal crash and improve the safety performance of automobile to ensure the safety of passengers has aroused great concern of the whole society.As computer simulation technology is becoming more and more mature,computer simulation technology can be used to find the irrational structure in the early stages of the design,so as to guide the design of the automobile and optimize the structure,which can optimize the design of the car structure,decrease the amount of experiments,shorten the product development cycle,reduce the cost of product development.This paper uses the computer simulation method analysis frontal 100 % crash of the model used in this article,uses mathematical model to optimize the structure.The main contents are as following:(1)This paper expounds the significance of frontal crash,shows the car crash regulations,reflects research development of car crash and the current situation at home and abroad.(2)Describes the related theory of spatial configuration of objects in collision,motion differential equations,deformation control equation and structural finite element discretization.Introduce element single point Gauss integral calculation,hourglass control and theory of contact algorithms briefly.(3)Using software Hypermesh,adjust automobile CAD model,plot grid,set contact and load application in order to create finite element model.Meanwhile,generate K file which will be calculated by software LS-DYNA.(4)Analyses and verify the simulation results.Verify the correctness of the results from the point of view of energy variation and mass added.Analyse acceleration of B-pillar left and right sides,dash panel deformation and steering wheel variation in detail.It is found that the peak value of the right side of the B-pillar is high,so that it can affect the safety performance of the vehicle.(5)Combining with the structural characteristics of the vehicle model,increases the energy absorbing box before the front beam in order to reduce the B-pillar acceleration.With the method response surface methodology(RSM)and orthogonal experimental design(OED),establish the inducing groove mathematical models of its location,depth and width,which relate to the B-pillar acceleration.Through the optimization of the mathematical model to obtain more reasonable parameters.The optimizational simulation results show that the peak value of B-pillar can be reduced effectively and energy absorption effect has been further improved,so as to improve the crashworthiness index.