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

Video: Create edge-to-edge gluing and regions

Use Edge-to-Edge Gluing to connect two edges to prevent relative motion in all directions. A glue connection is a simple and effective method to join dissimilar meshes.

Note:

The nodes on the glued edges do not need to be coincident.

You can use the Edge-to-Edge Gluing command to define glue connections between selected:

• 2D element edges (CQUAD4, CQUAD8, CQUADR, CTRIA3, CTRIA6, CTRIAR).

• 2D axisymmetric element edges(CTRAX3, CQUADX4, CTRAX6, CQUADX8)

• Plane stress element edges(CPLSTS3, CPLSTS4, CPLSTS6, CPLSTS8)

• Plane strain element edges (CPLSTN3, CPLSTN4, CPLSTN6, CPLSTN8)

• Polygon edgesNote: If you select polygon edges to define the source or target element edges, the software applies the glue to the 2D elements associated with those edges.

With the Edge-to-Edge Gluing command:

• The elements whose edges you are gluing must be nearly tangent along that edge. For example, you cannot glue the edges of two elements that are perpendicular.

• With 2D axisymmetric elements, the element can be defined in either the XY or XZ plane.

Supported analysis types

You can use the Edge-to-Edge Gluing command to define glue at selected edges in all Simcenter Nastran solutions except SOL 601 and 701.

Defining the source and target edges

You use regions to define the locations in the model where you want to glue edges together. A region is a collection of homogenous entities that you can use to define boundary conditions, such as glue and contact definitions.

• To have the software use edge separation conditions in the FEM file to automatically create the regions, select Automatic Edge to Edge Pairing and click Edge Pairs. You can use the Create Automatic Edge Pairs dialog box to select the edge separation conditions to determine the edges to glue. You can also use the Grouping option to control how the software groups the edge pairs in the edge separation conditions into contact or glue definitions.Note: The software lists the names of the edge separation conditions that define the glued edges in the Description column of the Simulation Navigator for the appropriate Edge-to-Edge Gluing objects.If the edges in an edge separation condition change because the FEM file updates, the software does not update the associated Edge-to-Edge Gluing definition. If an edge in an edge separation condition is deleted or its ID changes because the FEM file updates, the software changes the status of the associated Edge-to-Edge Gluing definition to asleep (inactive).For more information on edge separation conditions, see Edge Separation Condition.

• To manually create regions to specify the source and target edges to glue, select Manual Edge to Edge Glue and you use the Source Region and Target Region options to select or create simulation regions to define the glued edges. For a glue definition, a region is a collection of 2D element edges in a section of the model where want to glue edges together. You use the Simulation Region command to define the regions affected by the glue condition.For more information on regions, see Working with reusable regions.

When you solve your model, Simcenter Nastran generates glue elements between the defined source and target regions. Glue elements are stiff springs that connect and constrain the edges and surfaces. Simcenter Nastran always uses a weld-like formulation to create the connection. This corresponds to the GLUETYPE=2 option on the BGPARM bulk data entry.

Using a Glue Parameters modeling object to control the glue algorithm

If you include an Edge-to-Edge Gluing simulation object in your solution, you can use the options in the Glue Parameters dialog box to locally override the Simcenter Nastran global glue parameters. These options correspond to the fields on the BGPARM bulk data entry.

Note:

Only the Penalty Factor and Penalty Factor Units options in theGlue Parameters dialog box are applicable to Edge-to-Edge Gluing definitions. Simcenter Nastran ignores all other options.

For more information, see Glue Parameters overview.

Associated Simcenter Nastran syntax

When you solve or export your model:

• The options in the Edge-to-Edge Gluing dialog box define a BGSET bulk data entry in your Simcenter Nastran input file.

• The options in the Region dialog box define a BEDGE bulk data entry for the source (edge) and target (edge) regions.

Requesting force results for edge-to-edge glue

You can use the options on the Glue Result tab in the Structural Output Requests dialog box to request force results when you solution contains an Edge-to-Edge Gluing condition. The options on the Glue Result tab correspond to the Simcenter Nastran BGRESULTS case control command.

Note that:

• Simcenter Nastran does not output glue tractions.

• The glue force unit for axisymmetric elements is force/2π. This unit is consistent with the applied and reaction force unit for these elements. Shell, plane stress, and plane strain elements use force units.

Additional information

For more information, see:

• BGSET and BEDGE 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 or axisymmetric structural as the analysis typeAn active Simulation file with Simcenter 3D Multiphysics as the specified solver environment and a Coupled or Structural analysis type.
Command Finder	Edge-to-Edge Gluing
Simulation Navigator	Right-click Simulation Objects→New Simulation Object→Edge-to-Edge 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)

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

Advanced nonlinear contact for axisymmetric elements (Simcenter Nastran)

Automatic face pairing

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Edge-to-Edge Gluing (Simcenter Nastran, Simcenter 3D Multiphysics), Simcenter 3D 2021.1 Series

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