Add a Boundary to Boundary node to connect two shell boundaries that are geometrically disjoint. It is assumed that the boundaries are parallel. The connection between corresponding points on the two edges can be rigid or flexible.
For Rigid, the coupling between the two boundaries is rigid in a pointwise manner. Every node on the destination boundary is coupled by a virtual rigid bar to the nearest point on the source boundary. This does not imply that the whole boundary is rigid. Such a coupling can be obtained using a
Rigid Connector.
For User defined, enter the
Spring constant per unit area. This is a matrix
K, coupling the displacements on the two sides.
Here, f is the force acting on the destination side, and
Δu is the difference between the destination side displacements and the source side displacements. All vectors are expressed in the selected coordinate system.
Optionally, you can enter a Mass per unit area,
ρu,A. This can for example be the mass of a glue layer.
In all cases, select the Source boundary and
Destination Boundary —
Top or
Bottom. The information is used for two purposes: to connect to the correct set of displacements, and to compute the distance, including the shell thickness and offset.
To display this section, click the Show More Options button (
) and select
Advanced Physics Options in the
Show More Options dialog box. The information in this section i sonly used if
Method is set to
Rigid.