Study On Inverse Method For Hyperelastic Material Parameters Of Automotive Rubber

With the rapid development of our country automobile industry, the automobile performances of the traffic safety and riding comfort become more important concerned by customers. In order to reduce and isolate the automobile vibration, rubber flexibility connections are widely used in engine system, drive system, body system and so on. The controllability and stability directly impact on the automobile safety, so rubber flexibility connections are also used in front and rear suspension systems as well as the control mechanism. With the automobile research techniques improving, the automobile subsystems are also required to develop into the high-performance direction. The computer simulation analysis becomes more and more important in the rubber structure design. However, the lack of hyperelastic material parameters brings lots of difficulties in the actual engineering conditions.There’re many forms of constitutive models when describing rubber materials mechanics performances. The traditional method to get hyperelastic material parameters is based on rubber material foundation experiment, which needs special test samples. Actually, the experiment can be hardly completed because of those problems such as the hardly obtained special test samples, the imperfect test standards, as well as the lack of both test conditions and instruments. Based on those unsolved problems, this article proposes a inverse method to get the hyperelastic material parameters according to the idea of the inverse method of the combination with simulation analysis and optimization algorithm.During the inverse, this article introduces the surface optimization method, compares and analyzes two kinds of fitting methods in establishing response surface. It proved that the response surface has high precision fitted by the moving least square and can be applied to the reverse optimization.In this article, the inverse method is verified via the given parameters of the rubber structural element, and the result shows that the parameters coming from reverse method are very close to the ones coming from the tradition methods. Though the verification, it proves the validity and feasibility of the reverse method referred in this article. Besides, this article also researches the parameter inverse of different constitutive models and also gets the ideal results.Carry on the inverse of the automobile rubber cushion blocks involved with the essential method for the rubber structural element experiment. The parameters solved are very close to the test results, and they can be applied to simulation analysis. As a result, in the automobile structure or other projects, we can select the appropriate constitutive models for the rubber structural element, combined with simulation analysis and actual working conditions, also carry on the corresponding test for the rubber element in the working condition simulations, and then obtain the material parameters used the inverse methods referred in the article.According to the research above, on the conditions of unavailable standard samples as well as the lack of the test equipment, the inverse method referred in this article is simple, practical and high-accuracy compared with the traditional methods, and nearly can be applied to all the hyperelastic constitutive models also the large deformation of the rubber and to meet the actual needs in engineering problems. It’s rather significant in engineering and provides new research methods and approaches to dealing with the rubber hyperelastic material parameters.