Predeformation

Use the subnode to specify that the elastic forces in Spring Foundation, Spring Foundation, Interface, Thin Elastic Layer, or Thin Elastic Layer, Interface are nonzero at zero displacement. Thus, you can model cases where the unstressed state of the spring is in another configuration than the one described by the geometry.

The value of the predeformation can vary during the simulation, so it should not be interpreted as an initial value.

Shell Properties

This section is only present when is used as a subnode to or .

Select the layers for which this predeformation value is to be used. You can only select a subset of the layers selected in the parent node.

Interface Selection

This section is only present when is used as a subnode to or .

Select the interfaces for which this predeformation value is to be used. You can only select a subset of the interfaces selected in the parent node.

•

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

•

For more information about the use of springs, see Springs and Dampers in the Structural Mechanics Modeling chapter.

•

For a theoretical background, see Spring Foundation and Thin Elastic Layer in the Structural Mechanics Theory chapter.

•

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

Location in User Interface

Physics tab with , , , or node selected in the model tree: