Front 40% Offset Collision Simulation And Body Structure Safety Optimization Of A SUV

At present,the car-SUV is very hot in Chinese market,the car brings us convenience whilst it would cause some collision safety problems.This paper conducts a research on some popular SUV styles in the market on the basis of the China-New Car Assessment Program which is enacted by the China Automotive Technology Research Center,through the approach of collecting and referencing the laws and regulations formulated by related institutions in various countries.With the development of computers,using finite element simulation software to solve the vehicle collision problems has now become a major research tool of the automobile manufacturers and research institutions,LS-DYNA is one of the most popular finite element analysis software with the basic theory of dynamic display of finite elements as its working principle.This paper takes a car-SUV as the research object,aiming at improving its frontal 40%offset collision safety performance.In accordance with the test requirement in the 2012 C-NCAP requirements,this paper,through modeling and optimizing simulation,carries on a series of researches as follow.(1)It builds a CAD model of a SUV through reverse engineering and CATIA software to and generating the k file via the pre-processing of HyperMesh software,and finally submits to LS-DYNA software for calculation,simulates the automobile positive 40%offset deformable wall barrier crash test.(2)The simulation calculation results from the LS-DYNA with the real car crash test data are compared in order to examine the credibility of the model,so as to find a effective way of modeling and eventually establish a reliable CAE model.(3)Analyzing the simulation calculation results,to optimize the model vehicle body structure according to deficiency discovered in the small-overlap crash test and on the basis of energy absorption principle.(It includes the optimization of the thickness of the bumper beams,the optimization of the body structure and thickness of the energy-absorbing box and the front beam,and also the optimization of the material,thickness and structure of the A-pillar).And submitted the optimized model to LS-DYNA software for calculation.(4)Through the analysis of the calculation results before and after the optimization,the effectiveness of optimizing the body structure has been fully proved in this paper,and the safety performance of the SUV is successfully improved.