Hyperelastic Material

The subnode adds the equations for hyperelasticity at large strains. Hyperelastic materials can be suitable for modeling rubber and other polymers, biological tissue, and also for applications in acoustoelasticity.

The Nonlinear Structural Materials Module is required for this feature. For details, see https://www.comsol.com/products/specifications/.

When a hyperelastic material is included in your model, all studies are geometrically nonlinear. The check box in the study settings is selected and cannot be cleared.

By adding the following subnodes to the node you can incorporate many other effects:

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Thermal Expansion (for Materials)

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Select the layer or layers for which this material model is to be used.

Table 6-3: Layer Selections; Hyperelastic Material
Selection	Use All Layers	Selection of Individual Layers
Boundary	Same as interface selection when the node is added.	When Use all layers is not selected. Only a subset of the layers selected in the parent can be selected.

Data given in the other sections of this node applies to all layers. Thus, if you enter material data explicitly, rather relying on the default option, you will override that material property for all selected layers.

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All other settings for the node are described in the documentation for Hyperelastic Material in the Solid Mechanics interface.

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For a general description of layer and interface selections, see The Shell Properties and Interface Selection Sections.

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You can provide material parameters with a through-thickness variation by explicitly or implicitly using expressions containing the extra dimension coordinate as described in Using the Extra Dimension Coordinates.

Location in User Interface

Context Menus

Ribbon

Physics tab with selected: