Based On The LS-DYNA Optimum Design For Crash Energy Absorbtion Ability Of Car Front Side Member

In recent years, the rising number of people caused by traffic accident makes car’smanufacturers and consumers pay much attention to safety problem. With the growing ofconsumer’s security concept, automobile manufacturers will also put the security in animportant position during design. Therefore, automobile safety has become an importantresearch field of automotive engineering, and has gotten the much attention of the society.Because the real crash test takes longer time and higher cost, generally only a littleconfirmatory test. In the practical product design, using a large number of finite elementanalysis method to replace the crash test, and the results show that, by using the nonlineardynamic analysis software LA-DYNA collision simulation and real crash test results areagreement, it can effectively substitute the real car test collision analysis.When the car has a frontal crash, the plastic deformation of the front body will absorbmost of collision energy, and the front side member play an important role in the process. Inorder to ensure the cab as complete as possible, more than70%of collision energy must beabsorbed by front side member. The ideal front side member design should make the frontside member absorb most of the energy in the vehicle collision, reducing its impact on thehuman body injury. To study the relationship between the structure and deformation, thefront side member can be simplified into a thin shell element, so as to finish the securitydesign of front side member. Therefore, the study of thin wall front side member energyabsorbing characteristics has important significance to design of front side member.In order to make the car front side member absorb more energy in colliding process,this paper have studied energy absorption characteristics base on different spot spacingdeviation, plate thickness, material characteristics and so on, considering the overall andoffset40%collision energy absorbing characteristics of the front side member, and finishedoptimum design of the front side member base on the design parameters of the front sidemember, such as different cross-section shapes, thickness, spot weld pitch, spot diameterand collision direction deviation by using LS-DYNA and the response surface optimization,thus obtains the front side member being the best energy absorbing characteristics.