Defining the Hyperelastic Material Continuum
You model the rubber diaphragm with the Neo-Hookean model for hyperelastic
materials. This model requires the bulk modulus and the
The bulk modulus of a material,
- Right-click the Reports node and select .
- Rename the Expression 1 node to Rubber_BulkModulus_Computed.
-
Select the
node and set the following properties:
Property Setting Dimensions Pressure Units GPa Definition ${Rubber_YoungsModulus_InputReport}/(3*(1-2*${Rubber_PoissonsRatio_InputReport})) - Repeat steps 1 and 2 but rename the Expression 1 node to Rubber_c10_Computed.
-
Select the
node and set the following properties:
Property Setting Dimensions Pressure Units GPa Definition ${Rubber_YoungsModulus_InputReport}/(4*(1+${Rubber_PoissonsRatio_InputReport})) 注 Units definition only affects the output of the report in the Output window and not the interpretation of the input Definition. For example, Units of Pa defined as <10MPa> would have an output of 1.0e7 Pa. However, units of MPa defined as 10 would have an output of 10e-5 MPa.
- Create a physics continuum.
- Rename the Structure. node to
-
For the Structure physics continuum, select the
following models in order:
Group Box
Model
Space Three Dimensional Material Solid Time Implicit Unsteady Optional Models Solid Stress
Material Law Models (Selected automatically)
Nearly Incompressible Material
Nonlinear Geometry
-
To define the material law in the Structure Model
Selection dialog:
-
Specify the solid material and define its properties:
- Right-click the Replace with.... node and select
- In the Replace Material dialog, select Rubber (Arion Thermabond 99180T010), and click OK.
- Edit the node.
- Select the ${Rubber_BulkModulus_ComputedReport}. node and set Value to
- Select the ${Rubber_c10_ComputedReport}. node and set Value to
- Select the Structure. node, and set Physics Continuum to
- Save the simulation.