THE NONLINEAR CONSTITUTIVE RELATION OF INCOMPRESSIBLE VISCOELASTIC MATERIALS

By using the tensor analysis, the paperproves that the three theories for describing the nonlinear constitutiverelation of incompressible viscoelastical materials,including BKZ theory, Lianis theory andChirstensen theory, have a samerepresentation when they are used for the uniaxial tension of isotropicmaterials. And we also show that the three theories amount the samein explaining the nonlinear constitutive relation.