Plasticity
Use the Plasticity subnode to define the properties for modeling elastoplastic materials. This material model can be used together with the Linear Elastic Material and Hyperelastic Material.
The Nonlinear Structural Materials Module is required for this feature. For details, see https://www.comsol.com/products/specifications/.
Shell Properties
Select the layer or layers for which this plasticity model is to be used.
Table 6-7: Layer Selections; Plasticity
Selection
Use All Layers
Selection of Individual Layers
Boundary
Same as parent 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.
If the plasticity model differs between layers, you will need to add several Plasticity nodes with different layer selections. If the model is the same, and only the material data values differ, you can use a single Plasticity node where From material is used to define the values. The data for each layer is then received from global Layered Material nodes.
If there are two Plasticity nodes where the same layer is selected on the same boundary, the latter will be overridden on the common selections
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All other settings for the Plasticity node are described in the documentation for Plasticity 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.
Plasticity Model
Use this section to define the plastic properties of the material.
Plasticity Model
Select Small plastic strains or Large plastic strains to apply either an additive or multiplicative decomposition between elastic and plastic strains.
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When using plasticity together with a hyperelastic material, only the option Large plastic strains.
The other settings are the same as described in Plasticity Model for Solid Mechanics.
Location in User Interface
Context Menus
Layered Shell>Linear Elastic Material>Plasticity
Layered Shell>Hyperelastic Material>Plasticity
Ribbon
Physics tab with Linear Elastic Material node selected in the model tree:
Attributes>Plasticity