Material Parameter Identification And Structure Optimization Based On Incomplete Stiffness Information Of Bushing

Rubber bushing is a very important part of the vehicle system.The stiffness of the bushing has great influence on the handling stability and riding comfort of the vehicle,which is mainly determined by the structure and material of the rubber bushing.This paper has done the following research based on the bushing design and development project of a certain enterprise: how to reverse the constitutive parameters of rubber through basic experimental data of incomplete mechanical properties of rubber is studied.In the absence of material parameters of rubber bushing,how to reverse the material parameters of rubber bushing through incomplete experimental data of rigidity is studied.Based on mesh deformation technology,how to automate the technological process of structural optimization of rubber bushing is studied.This article focuses on the following three parts:1.Based on the research method of rubber static mechanics,the basic mechanical properties of rubber materials are tested: uniaxial tensile test and plane tensile test.The hyperelastic constitutive model of rubber was identified by experimental results,and the coincidence degree between different constitutive fitting stiffness curves and experimental stiffness curves is studied.Finally,the Yeoh constitutive model is selected as the rubber constitutive of rubber bushing.2.Because many enterprises lack experimental conditions for mechanical properties of the rubber,and this study is also lack of biaxial tensile experimental data,so the material parameters identified by material characteristics experiments have great errors with the actual parameters of rubber materials.In order to solve this problem,a method based on the experimental data of incomplete stiffness of rubber bushing to identify the material parameters of rubber bushing is proposed in this paper.The stiffness curve obtained from the experiment and the simulation stiffness curve obtained by the simulation.Combining ISIGHT software with ABAQUS and MATALAB,taking rubber constitutive parameters as design variables and taking the area difference between the simulation stiffness curve and the experimental stiffness curve as the optimization objective,NLPQL is selected as the optimization algorithm to optimize the material parameters of the rubber bushing.3.Finally,the material parameters of the rubber bushing are used to optimize the material parameters identified.Using ISIGHT combined with finite element softwareABAQUS and grid deformation software Sculptor,the automation model of structural optimization design for bushing model is established.In the model,the structural size of bushing is taken as the design variable,and the stiffness of rubber bushing as the objective function.NSGA-II is chosen as the optimization algorithm,and the structural optimization model is established.Finally,the stiffness and target value of the rubber bushing model have some error,but it is within the range of engineering error.The feasibility of the method is proved,and a reference method is provided for the optimal design of the related types.