Neo-Hookean
The Neo-Hookean material model is described in terms of the strain energy potential, W, as follows:
where
![](../../simulate/simulate/images/mooney_rivilin_C10.gif)
and
![](../../simulate/simulate/images/mooney_rivilin_d.gif)
are material constants.
You can use materials constants to calculate the initial shear modulus as follows:
You can also calculate initial bulk modulus for the material as follows:
When you select
Neo-Hookean material model
to define the hyperelastic material, you must specify values for
![](../../simulate/simulate/images/mooney_rivilin_C10.gif)
and
![](../../simulate/simulate/images/mooney_rivilin_d.gif)
.
For materials that are nearly incompressible, the software uses incompressibility conditions. If the specified value of
![](../../simulate/simulate/images/mooney_rivilin_d.gif)
is less than
![](../../simulate/simulate/images/arruda_boyce8.gif)
, the software uses following value of
![](../../simulate/simulate/images/mooney_rivilin_d.gif)
during analysis:
![](../../simulate/simulate/images/mooney_rivilin_d.gif)
=
![](../../simulate/simulate/images/arruda_boyce8.gif)
.
where G is the initial shear modulus.
The software calculates these constants when you select
Neo-Hookean material model on the
Hyperelastic Material Definition dialog box.