Viscoplasticity
Use the Viscoplasticity subnode to define the viscoplastic properties of the material model. Viscoplasticity can be added to Linear Elastic Material, Linear Elastic Material, Layered, and Nonlinear Elastic Material.
The Nonlinear Structural Materials Module is required for this feature. For details, see https://www.comsol.com/products/specifications/.
If the Composite Materials Module is available, the viscoplastic model can be applied to arbitrary layers in a multilayered membrane.
See also the discussion in Layered and Nonlayered Membranes.
Shell Properties
This section is present only when the Viscoplasticity node is used under Linear Elastic Material, Layered.
Select the layer or layers for which this plasticity model is to be used.
Table 7-6: Layer Selections; Viscoplasticity.
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.
When the viscoplasticity model differs between layers, you will need to add several Viscoplasticity nodes with different layer selections. If the model is the same, and only the material data values differ, you can use a single Viscoplasticity node where From material is used to define the values. The data for each layer is then received from global Layered Material nodes.
If the same layer is selected in two Viscoplasticity nodes being active on the same boundary, the second definition will override the previous.
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All other settings for the Viscoplasticity node are described in the documentation for Viscoplasticity 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
Membrane>Linear Elastic Material>Viscoplasticity
Membrane>Linear Elastic Material, Layered>Viscoplasticity
Membrane>Nonlinear Elastic Material>Viscoplasticity
Ribbon
Physics tab with Linear Elastic Material, Linear Elastic Material, Layered, or Nonlinear Elastic Material node selected in the model tree:
Attributes>Viscoplasticity