Controlling the stiffness of edge-to-surface glue (Simcenter Nastran)

You can use the Edge-to-Surface Glue Stiffness Distribution on Glued Surface option in the Glue Parameters-Linear Global dialog box to change how the edge-to-surface glue stiffness is distributed on the surface being glued. This option corresponds to the ESOPT field for the BGPARM bulk data entry.

Shell element theory does not account for changes in shell thickness or normal strains that are perpendicular to the plane of the shell element. The Edge-to-Surface Glue Stiffness Distribution on Glued Surface option lets you choose to handle the linking of the zero normal strains. These strains exist in the shell element associated with the edge to the surface being glued.

In the graphic below, the blue line represents the shell element associated with the edge, and the green line represents the surface being glued.

Option	Description	Example
Strains Are Not Constrained	The strains in the plane of the surface being glued in the direction perpendicular to the edge are not constrained by the glue stiffness.
Strains Are Constrained	The strains in the plane of the surface being glued on the area corresponding to the shell element thickness (t/2) in the direction perpendicular to the edge, are constrained by the glue stiffness. This is the glue stiffness behavior that existed before NX Nastran 8.5.

The following example illustrates the differences between the Edge-to-Surface Glue Stiffness Distribution on Glued Surface option. This example includes an equal compressive pressure load on the top and bottom of the solid elements. Here, the edges of elements in the 2D mesh (shown in blue) are glued to the faces of the elements in the 3D mesh (shown in green).

Option	Description	Example
Strains Are Not Constrained	The deformations in the solid mesh demonstrate that the glue stiffness did not prevent local strain at the glue interface.
Strains Are Constrained	The deformations in the solid mesh demonstrate that the glue stiffness did prevent local strain at the glue interface.

Additional information

For more information, see:

• BGSET, BEDGE, and BSURF or BSURFS in the Simcenter Nastran Quick Reference Guide

• Gluing Elements in the Simcenter Nastran User’s Guide

Where do I find it?

Application	Pre/Post
Prerequisite	An active Simulation file with Simcenter Nastran as the specified solver environment and structural as the analysis type
Command Finder	Edge-to-Surface Gluing
Simulation Navigator	Right-click Simulation Objects→New Simulation Object→Edge-to-Surface Gluing

How do I

Define surface-to-surface contact

Define surface-to-surface gluing (Simcenter Nastran)

Define edge-to-surface gluing

Create an axisymmetric nonlinear contact

Learn more

Contact and glue overview (Simcenter Nastran, Simcenter 3D Multiphysics)

Defining parameters for contact conditions (Simcenter Nastran)

Defining parameters for glue conditions

Previewing contact and glue element locations (Simcenter Nastran)

Surface-to-Surface Contact (Simcenter Nastran, Simcenter 3D Multiphysics, Abaqus, ANSYS)

Surface-to-surface gluing (Simcenter Nastran, Simcenter 3D Multiphysics)

Edge-to-Edge Contact (Simcenter Nastran, Simcenter 3D Multiphysics)

Internal edges for source and target regions

Edge-to-Surface Gluing (Simcenter Nastran)

Edge-to-Edge Gluing (Simcenter Nastran, Simcenter 3D Multiphysics)

Advanced nonlinear contact for axisymmetric elements (Simcenter Nastran)

Automatic face pairing

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Controlling the stiffness of edge-to-surface glue (Simcenter Nastran), Simcenter 3D 2021.1 Series

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