Edge Separation Condition

Use the Edge Separation Condition command to convert a single edge that is shared between two topologically connected faces into two distinct, separate edges. You may want to create two separate edges to:

• Define a joint between the components.

• Ensure that separated edges have coincident nodes.

For example, you can use the Edge Separation Command to create a break in the polygon geometry and the mesh to define a glue or contact joint in a 2D thermo-mechanical model.

In the graphic below, the Edge Separation Condition command is used to create separate edges on a flange to facilitate the creation of a joint at that location.

Requirements to separate edges

To use the Edge Separation Condition command on an edge or chain of connected edges, the edges:

• Must be interior edges in a sheet polygon body. You cannot use the Edge Separation Condition command in a solid body.

• Must be shared by exactly two faces.

• Cannot form a closed loop if they are connected.

Managing Edge Separation Conditions

The software stores each edge separation condition in the new Edge Separation Condition definition in the Mesh Controls node in the Simulation Navigator.

You can use the Edge Separation Condition node, for example, to control the display of selected edge separation conditions or to delete them.

Using Edge Separation Conditions to define glue and contact conditions

In Simcenter Nastran or Simcenter 3D Multiphysics solutions, you can use edge separation conditions from the FEM file to define contact and glue conditions between edges. When you select the Automatic Edge Pairing option in the Edge-to-Edge Contact or Edge-to-Edge Gluing dialog boxes, you can then click Edge Pairs and use the Create Automatic Edge Pairs dialog box to select the appropriate edge separation conditions. Using edge separation conditions to define contact or glue conditions makes the process of defining those conditions easier as you do not need to reselect the contacting or glued edges.

Note:

If the edges in an edge separation condition change because the FEM file updates, the software does not update the associated Edge-to-Edge Contact 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 Contact definition to asleep (inactive).

For more information, see:

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

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

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed part
Command Finder	Edge Separation Condition

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Edge Separation Condition, Simcenter 3D 2021.1 Series

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