Spring Foundation, Interface
Use the Spring Foundation, Interface node to apply elastic and damping boundary conditions on the interfaces of material layers (on boundaries, edges, and points) of a layered shell. For applying spring conditions on a layer, see Spring Foundation.
By adding the Predeformation subnode, you can prescribe that the spring force is zero at a nonzero spring extension.
Interface Selection
Select the interface or interfaces for which this spring condition is to be added.
Table 6-56: Interface Selections; Spring Foundation, Interface.
Selection
Apply To
Selection of Individual Interfaces
Boundary
When added: Exterior interfaces.
When Selected Interfaces is selected.
Only exterior interfaces can be selected.
Edge, Point
When added: Top interface.
When Selected Interfaces is selected.
Any interface can be selected.
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All other settings are described in the documentation for Spring Foundation in the Solid Mechanics interface.
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For more information about the use of springs, see Springs and Dampers in the Structural Mechanics Modeling chapter.
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For a theoretical background, see Spring Foundation and Thin Elastic Layer in the Structural Mechanics Theory chapter.
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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 activate and deactivate this boundary condition by assigning it to a constraint group. See Load Cases in the Structural Mechanics Modeling chapter.
Location in User Interface
Context Menus
Layered Shell > Mass, Spring, and Damper > Interfaces > Spring Foundation, Interface (Boundary, Edge)
Layered Shell > Points > Interfaces > Spring Foundation, Interface
Ribbon
Physics tab with Layered Shell selected:
Boundaries > Interfaces > Spring Foundation, Interface
Edges > Interfaces > Spring Foundation, Interface
Points > Interfaces > Spring Foundation, Interface