Inversion of constitutive parameters of polyurethane materials based on virtual field method
To reveal the superelastic properties of polyurethane materials,this paper conducted uniaxial tensile tests on polyurethane specimens with a Shore hardness of 90A.Firstly,the full field deformation of the specimens was obtained using Digital Image Correlation(DIC),and then the constitutive parameters of the second-order Mooney-Rivlin model and Ogden model were inverted using a numerical program based on the Virtual Field Method(VFM).Finally,a comparison was made between the Model Update Method(FEM)and the VFM.The results show that the load displacement curves of the second-order Mooney-Rivlin hyperelastic constitutive model and Ogden hyperelastic constitutive model obtained based on the VFM are highly consistent with the experimental load displacement curves,while the load displacement curves of the Ogden model obtained through the finite element model updating method do not match well with the experimental load displacement curves.These results reveal the advantages of the virtual field method over the finite element model updating method in inverting the constitutive parameters of polyurethane materials.
polyurethane materialdigital image correlation methoduniaxial tensile testvirtual field methodfinite model updating methodsecond-order Mooney-Rivlin modelOgden model