Polynomial Form of order 2

The equation of strain energy potential, W in Polynomial Order 2 is as follows:

where , , , , , , 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 Polynomial Order 2 material model to define the hyperelastic material, you must specify values for , , , , , , .

For materials that are nearly incompressible, Creo Simulate uses incompressibility conditions. If the specified values of and is less than,

Creo Simulate uses following values of and during the analysis:

=.

=.

where G is the initial shear modulus.

Creo Simulate calculates these constants when you select Polynomial Order 2 material model on the Hyperelastic Material Definition dialog box. If you create only the Planar test in the test area of the Hyperelastic Material Definition dialog box, Creo Simulate can not calculate these constants for Polynomial Order 2 material model. You must create a Uniaxial test or an Equibiaxial test.

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