Experimental Study And Numerical Simulation Of Hyperelastical Behavior Of Rubber-like Materials

Rubber-like materials occupy an important position in people's life and industrial production.Especially in recent years,with the development of biomechanics,it has been found that the biomechanical properties of biological soft tissue are similar to those of rubber-like materials.Therefore,there has been a consensus in the field of mechanics to study the mechanical properties of biological soft tissue by using the research methods of rubber-like materials.The experimental study and numerical simulation on the mechanical behavior of rubber-like materials have certain engineering significance and value.The main research work of this paper mainly includes the following aspects:(1).Based on the finite deformation theory,the constitutive model of rubber materials proposed by Gao Yuchen is modified.Based on the modified constitutive model,the finite deformation problems of rubber-like materials,such as uniaxial tension,equibiaxial tension and simple shear,are theoretically analyzed.Based on the user subroutine interface provided by ABAQUS software,a user subroutine based on modified constitutive model is developed.The finite deformation problems of rubber-like materials,such as uniaxial tension,equibiaxial tension and simple shear,are numerically simulated by using this subroutine.The numerical simulation results are compared with the theoretical analytical solutions.The influence of different material parameters on Cauchy Stress was also analyzed.(2)The basic deformation of rubber materials under basic load was studied experimentally,including uniaxial tensile test,plane tensile test and equibiaxial tensile test.The constitutive models of several kinds of commonly used rubber-like materials were fitted by using uniaxial tensile test data,uniaxial tensile test data and plane tensile test data and using three groups of experimental data at the same time.The fitting ability of each constitutive model under different data combinations is compared.In addition,the inflatable experiment and finite element simulation of circular rubber film are studied in this paper.The results of inflatable experiment,numerical simulation and equibiaxial tension of circular rubber film were compared.(3)Based on the second-order Poly model and the third-order Ogden model,the numerical simulation of rubber film tube inflation is carried out.The simulation results based on two constitutive models are compared.At the same time,based on these two models,the finite deformation problems of two kinds of rubber films with cavity defects and rigid inclusion defects are simulated and analyzed.The effects of different constitutive models on the mechanical properties of rubber films were compared.