Specifying planar test data for an isotropic hyperelastic material model

Create an isotropic hyperelastic material model as described in Providing test data to define an isotropic hyperelastic material.”

From the Test Data menu in the Edit Material dialog box, select Planar Test Data.

A Test Data Editor appears.

Toggle on Apply smoothing if you want Abaqus to apply a smoothing filter to the stress-strain data. This option is particularly recommended if you are using a Marlow model.

If you have requested data smoothing, click the arrows to the right of the Apply smoothing field to specify the number of data points to the right and left of each data point within which Abaqus will fit a least-squares polynomial.

If you are defining a Marlow model, you can select the following options:

• To include lateral nominal strain data, toggle on Include lateral nominal strain.

  A column labeled Lateral Nominal Strain appears in the Data table.

• To define behavior data that depend on temperature, toggle on Use temperature-dependent data.

  A column labeled Temp appears in the Data table.

• To define behavior data that depend on field variables, click the arrow to the right of the Number of field variables field to increase or decrease the number of field variables.

  Field variable columns appear in the Data table.

In the Data table, enter the test data:

Nominal Stress

Nominal stress, $T_S$.

Nominal Strain

Nominal strain, ${ϵ}_S$.

Lateral Nominal Strain

Nominal lateral strain, ${ϵ}_3$.

Temp

Temperature, $\theta$.

Field n

Predefined field variables.

You may need to expand the dialog box to see all the columns in the Data table. For detailed information on how to enter data, see Entering tabular data.

Click OK to return to the Edit Material dialog box.