Simulation Research On Steel-aluminum Hybrid Structure Crashworthiness Of Automotive Front Rail

In recent years, With the growing car ownership，The urban traffic congestion andparking difficult has become Increasingly prominent.Mini-car become a selling transport forits low price and low emissions.But the front energy absorption space of the small cars issmall, relative to the other cars, the passive safety of mini cars is generally deviation.Therefore, the research of crashworthiness for tiny car is worth to care and study.In this paper, front longitudinal of steel-aluminum hybrid structure is proposed. Lookforward to fusing the characteristics of aluminum alloy and high-strength steel,And makingthe rfont of longitudinal occur carsh deformation, while using high strength steel in theback-end of rfont longitudinal to avoid bending deformation.All of this is to achieve thepurpose of improving the crashworthiness. This article set the yaris automotive finite elementmodel that obtained through an open channels as the research object, According to the C-NCAP100%head-on collision condition to establish the base of the finite element model toget the peak acceleration and the maximum firewall intrusion in the collision. Correspondingsimplified model is set up to research single high strength steel and aluminum of thecrashworthiness by different materials and thickness in vehicle front collision impact, andcompared two kinds of material in the rfont longitudinal beam of energy absorption and theback-end collision force peak. While using high quality materials can reduce the firewallintrusion, but it is raise peak at the expense of collision force, longitudinal beam deformationpatterns did not have big change before, for this kind of situation, this article put forward therfont longeron recently changed to aluminum alloy material, and carried out rfontal crashsimulation analysis for the simplified model. Finally, the front longitudinal of steel-aluminumhybrid structure is applied to the vehicle, and through RBF approximation model methods tooptimize the thickness and material on the front of the vehicle structure.Research results show that the rfont longitudinal of steel-aluminum hybrid structure canefficiently increase the rfont longitudinal crashworthiness, comparing to the basemodel,firewall intrusion decreases10%，on the letf side of the acceleration decreases by4.1%，and the right side of the acceleration decreases by9.05%. this structure not only increases theenergy absorption, also can reduce the collision force peak, solved the problem of the singlematerial at the expense of the collision force peak to improve the energy absorption, to thedevelopment of the body structure has a certain reference value.