Spring Foundation
Use the Spring Foundation node to apply elastic and damping boundary conditions on the material layers (on boundaries, edges, and points) of a layered shell. For applying spring conditions on an interface, see Spring Foundation, Interface.
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When the selection is a boundary, a volumetric spring is added to the selected layers
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When the selection is an edge, a spring per area is added to the faces of the layers at the edge.
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When the selection is a point, a spring is added to the layer edges in the through-thickness direction for the selected layers.
By adding the Predeformation subnode, you can prescribe that the spring force is zero at a nonzero spring extension.
Shell Properties
Select the material layers to which the spring condition is to be applied.
Table 6-55: Layer Selections; Spring Foundation.
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.
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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.
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. Spring foundations 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 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 > Spring Foundation (Boundary, Edge)
Layered Shell > Points > Spring Foundation
Ribbon
Physics tab with Layered Shell selected:
Boundaries > Mass, Spring, and Damper > Spring Foundation
Edges > Mass, Spring, and Damper > Spring Foundation
Points > Layered Shell > Spring Foundation