Research On Optimum Design Of Automotive Protected-board With Composite Material

The research on lightweight of vehicle body is of great significance to the sustainable development of automobile industry.The application of composite materials is an important way to realize the lightweight of the vehicle body.With the improvement of the composite materials’ performance,it’s application is more and more extensive.In this paper,the glass fiber composite material was used in the automotive engine protected-board,and the structure of protected-board was optimized.The main research contents are as follows:Firstly,the mechanical properties of the glass fiber composite was tested.Due to the directionality of the fiber distribution,the composite material has obvious anisotropic property,and how to obtain the constitutive parameters of the composite material accurately becomes the key to the follow-up design.In this paper,the basic mechanical properties of the composite material was obtained by material tensile test,three-point bending test and impact test,which laid the foundation for further finite element analysis and structural design.Secondly,the glass fiber composite material was applied to the automotive engine protected-board,and the finite element analysis of the composite material protected-board was carried out according to the TS67-0057 falling ball test standard,including static analysis and modal analysis.The preliminary analysis results showed that the initial model of the protected-board cannot meet the design requirements,so it’s necessary to optimize the structure of the protected-board.Finally,the structure of the protected-board was optimized on the basis of static analysis.The optimization method adopted in this paper is a combination of topological optimization and topography optimization,the function of topology optimization is to make the parts reduce the use of materials as much as possible under the condition of satisfying the basic mechanical properties,while the topography optimization can improve the first order Modal frequency.Then modifed the structure of the protected-board according to the optimization analysis result,and obtained the improved protected-board model.The results showed that,compared with the initial model,the maximum deformation and the maximum stress of the optimal model were decreased by 57.23%and 17.89%respectively,while the first order modal frequency was increased by 33.17%,and the weight of the optimal model was decreased by about 14.81%under the same condition.The optimal model meets the use requirements and achieved the purpose of lightweight design.This method provides a reference for the further application of composite materials on vehicle parts.