Reverse Design And Simulation Analysis For Lightweight CFRP Vehicle B-column

Carbon fiber composite material is a kind of reinforcing composite material with light weight,high specific strength and good designability.Compared with the application research of carbon fiber composites on automobile covers,the application research on the structural parts of the car body is in the ascendant.The B-pillar is a typical and relatively independent structure of the car body structure.For safety reasons,it is often necessary to assemble a plurality of reinforcing plates in the structure,but this will not only lead to an increase in the overall quality of the car,but also lead to the design of the car body and The difficulty of assembly increases.Therefore,this paper takes the weight reduction of B-pillar assembly as the research goal,and carries out the reverse design,mechanical simulation analysis method and experimental research of carbon fiber-compliant material B-pillar reinforcement plate.The research is based on carbon fiber composite for other structural parts of body frame.The lightweight design of materials has certain reference significance.Firstly,based on the review of the application and research status of carbon fiber composites in the automotive industry,based on the anisotropic mechanical characteristics of composite laminates,the mechanical properties of carbon fiber composites are summarized and their macroscopic mechanics are analyzed.The carbon fiber composites are summarized.According to the strength theory,the factors affecting the stiffness are analyzed,and the relevant engineering constants affecting the performance of the composite are obtained,which provides a theoretical basis for the design and analysis of the carbon fiber composite B-pillar stiffener.Secondly,for the B-pillar structure with complex three-dimensional surface features,the Mesna three-coordinate scanner is used to scan the existing car metal B-pillar reinforcement plate to obtain the basic point cloud data of the automobile B-pillar,and with the help of CATIA The software performs point cloud processing and surface reconstruction,and establishes a three-dimensional model of the B-pillar to provide a geometric model for the design and analysis of the carbon fiber composite B-pillar stiffener.Thirdly,based on the requirements of lightweight B-pillar,based on the optimization of automobile B-pillar topology,the three-dimensional model of carbon fiber composite B-pillar was improved.According to the characteristics of carbon fiber composite B-pillar,the original metal B-pillar was modified.Partial structural characteristics;the initial layup design of carbon fiber composite B-pillars was determined,and the finite element model of carbon fiber B-pillar stiffeners was established.The material properties of metal B-pillars and carbon-fiber composite B-pillars were reasonably set.The free mode of the B-column and carbon fiber composite B-pillars,as well as the axial tensile,lateral bending and inward bending,were simulated.The simulation results show that the optimized carbon fiber composite B-pillar assembly can reduce the mass by 31.31%while ensuring that the rigidity of the original metal B-pillar assembly is not lower.Finally,on the basis of the carbon fiber composite B-pillar reinforcement plate,the static simulation and experimental comparison of the plain(0o)carbon fiber composite B-pillar reinforcement plate were carried out.The results show that the stresses on the B-pillar stiffeners are basically consistent with the simulated values.The numerical values and growth trends of the displacement data are also consistent with the simulation results.The experimental results show that the simulation method is applied to the analysis of carbon fiber composite B-pillar stiffeners feasibility.