Research On Lightweight For Passenger Car Spare Tire Warehouse

In recent years,resource issues,environmental issues have become increasingly prominent,while the car as one of the factors with these two issues are closely related,energy-saving and emission reduction is the bounden duty of the automotive industry.The lightweight design of the car is an important way to save energy and emission reduction,So lightweight has become a crucial research topic in automotive technology.Nowdays,Structural optimization,size optimization,new materials and lightweight technology are all the main ways of lightweight.From the current point of view,optimizing the structure of vehicles and using the lightweight materials is the most widely and obvious way.Based on these two approaches,this paper considering the strength,stiffness,assembly and forming process,cost,fatigue life and so on,and applies the technology of topology optimization and material replacement to research on lightweight for passenger car spare tire warehouse.In this paper,the finite element model of the original steel car spare tire warehouse is established by using Hyperworks finite element analysis software,and the boundary constraints and loads are imposed according to the actual constraints and loading conditions.The finite element static analysis of the original steel car spare tire warehouse is carried out,and discussing the stress distribution and deformation situation,and the bearing capacity of the structure is analyzed,which can provide reference for the later lightweight design.According to the main ways of lightweight,This paper take the topology optimization and material replacement of lightweight design.The former is based on the finite element variable density method,using the optistruct module in Hypermesh software to carry on the topological optimization to the original steel car spare tire warehouse,carrying on the finite element static analysis to the optimized structure,through the comparison finite element analysis result with satisfying the strength and the rigidity condition,And the optimized reduce the weight of 6.6%,achieve the purpose of lightweight.The latter through the application of new plastic composite material PP+LGF,and re-design and improved,according the finite element static analysis,the results show that the maximal stress of the improved PP+LGF spare tire warehouseis decreased significantly,and which is reduce the weight of 55.7% than that of the original one,lightweight effect is remarkable.The two lightweight ways of finite element analysis results,material properties,cost and so on by comparing the results of topology optimization and material replacement.Topology optimization lightweight effect is not obvious,and increase the process cost.And by replacing the plastic composite material PP+LGF,not only reducing the process costs,mold costs are greatly reduced.And the weight reduction effect is remarkable,reducing the weight of 55.7%.So consider that choose the lightweight way of materials replacement.Finally,after comparing the fatigue life of the replacement spare tire warehouse and the original steel spare tire warehouse,comparing the ansys results,PP + LGF plastic spare tire warehouse unit node maximum damage significantly reduced,the fatigue performance has been significantly improved.Then through road durability test for PP+LGF spare tire warehouse,no cracking,fixed point loosed,cracked,damaged and so on.It further validating the rationality and effectiveness of the lightweight design of the material replacement.Product performance is reliable,and realizing the lightweight design of the spare tire compartment.The research results in this paper can provide technical reference and reference for the research and development of lightweight automobile spare parts warehouse and other parts and components.