Damage

The subnode allows you to model damage and cracking in brittle materials according to various criteria. It is available in the Solid Mechanics, Shell, and Layered Shell interfaces, and it can be used in combination with the Linear Elastic 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 the damage is to be computed.

Table 6-18: Layer Selections; Damage.
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 damage input type differs between layers, you will need to add several nodes with different layer selections.

If the same layer is selected in two nodes being active on the same boundary, the contributions will be overridden.

•

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

•

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

•

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