Hyperelastic Material
The Hyperelastic Material 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 Include geometric nonlinearity check box in the study settings is selected and cannot be cleared.
By adding the following subnodes to the Hyperelastic Material node you can incorporate many other effects:
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Thermal Expansion (for Materials)
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Hygroscopic Swelling
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External Stress
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External Strain
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Damping
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Viscoelasticity
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Mullins Effect
Shell Properties
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 From material option, you will override that material property for all selected layers.
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All other settings for the Hyperelastic Material 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
Layered Shell>Material Models>Hyperelastic Material
Ribbon
Physics tab with Layered Shell selected:
Boundaries>Material Models>Hyperelastic Material