Table 4.

Universal relation between nonlinear elastic parameters of homogeneous isotropic hyperelastic materials in the general case where the nonlinear Poisson’s ratio ν^(H)(a)=ν₀(a) defined by (3.7) changes with the deformation, and in the particular case when ${\nu }^{(\mathrm{H})}(a)=\overline{\nu }$ is constant.