Lightweight Design Of Lower ARM Structure Based On Characteristics Of Carbon Fiber Composite

With the development of industrial technology,the consumption of energy is increasing day by day,forcing all countries to change accordingly.The automobile industry,as a major energy consuming industry,is the first to be changed.The lightweight of automobile has become one of the key technologies for the automobile industry to change,and the structural composite material is an inevitable trend of lightweight.At present,there are many researches on the properties of composite materials,but the lightweight design of injection molding structures has not been carried out.Based on the flow characteristics of the carbon fiber composite,the lightweight design of the structure is studied and classified into a method.Finally,the lightweight design of the low arm structure is carried out.First of all,this study is based on the characteristics of composite material as a guide,complete the research structure on the mechanical properties of composites;at the same time psi distribution in a flow field of the fiber ψ(θ,φ,t)research.Through the distribution law,it is found that in the flow field,the fiber tends to flow direction,and with the increase of shear rate,the fiber orientation concentration is stronger,which makes the fiber distribution direction more unified.Secondly,in the study of mapping theory,a material structure mapping method is constructed.This method can combine the mechanics analysis model of material properties in fiber model,structure of flow field in fiber distribution model and structure itself needs to be performed,the three independent model is mapped to a superimposed structure analysis model,the model can complete the analysis of composite structures.At the same time,a method of structure optimization based on fiber flow distribution is proposed.The first is in the injection flow field,shear rate changes will bring about changes in the gamma distribution of fibers,and based on this law,further through mathematical calculations found that the changes of gamma and the change of the area and structure section,while the cross-sectional area by equivalent changes,will turn into the N area of a section of S,by the end of the evolution,formation of a min m(l,N)optimization principle.The principle can effectively utilize the flow characteristics of composite materials and guide the optimization of structures.And take this theory as the core,design to form a method of structural optimization.In this method,a simple truss structure is constructed on the basis of topological optimization,and the structural cross section is optimized.The best cross section form is obtained by iteration,so as to optimize the structure.Finally,by the method of structure optimization analysis on the lower arm,after full consideration of carbon fiber composite material flow properties,through the min m(l,N)design variables,and complete the L and N optimization,optimization design completed the task.Finally,compared with the standard aluminum structure,structure and properties of composite materials in the performance optimization of the aluminum structure to reach the level of same performance considerably,but the composite structure weight than about 20%weight aluminum structure,the composite molding arm’s analysis,also achieved the purpose of lightweight lower arm at the same time,implementation of the lightweight composite materials have to assume.Combined with the properties of composite materials,the lightweight of new structure and new process,the structural optimization of the low arm is realized.