Added Mass
The Added Mass node is available for boundaries, edges, and points and can be used to supply inertia that is not part of the material itself. Such inertia does not need to be isotropic, in the sense that the inertial effects are not the same in all directions. The extra inertia is as a volumetric, boundary, or edge contribution to the selected material layers.
You can also add inertia to the interfaces between the material layers by using Added Mass, Interface.
Shell Properties
Select the material layers to which this added mass contribution is to be applied.
Table 6-61: Layer Selections; Added Mass.
Selection
Use All Layers
Selection of Individual Layers
Boundary, Edge, Point
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 physics interface can be selected.
Coordinate System Selection
The Coordinate system list contains all applicable coordinate systems in the model, including the Boundary system and the Layer local system. The Global coordinate system is selected by default. Added masses are specified along the axes of the selected coordinate system.
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See Defining a Layer Local System in the Composite Materials Modeling chapter.
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All other settings are described in the documentation for Added Mass 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 describe added mass densities 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 > Mass, Spring, and Damper > Added Mass (Boundary, Edge)
Layered Shell > Points > Added Mass (Point)
Ribbon
Physics tab with Layered Shell selected:
Boundaries > Mass, Spring, and Damper > Added Mass
Edges > Mass, Spring, and Damper > Added Mass
Points > Layered Shell > Added Mass