Advanced nonlinear contact for axisymmetric elements (Simcenter Nastran)

Use the Advanced Axisymmetric Nonlinear Contact dialog box to create a contact condition between axisymmetric elements in a Simcenter Nastran advanced nonlinear solution. The axisymmetric 2D element types CQUADX4, CQUADX8, CTRAX3, and CTRAX6 are supported. This command is available for solutions 601,106 and 601,129.

The contact definition consists of a flexible source region that you can pair with either a flexible target region or a rigid target region. For example, you might use the rigid method when you have a steel die stamping a softer metal.

You define the source and target regions by selecting nodes along a face edge.

Flexible target; (1) is the source and (2) is the target

Note:

The yellow block and cone symbols appear in the graphics window to represent the contact. The block indicates the source region and the cone represents the target region.

A rigid target contact region must be a sequence of nodes not connected to elements.

Rigid target; (1) is the source and (2) is the target

Note:

The direction of the yellow cone symbols has no significance.

Target contact side

Advanced nonlinear contact uses the target region's contact side (top or bottom) to determine if the contact condition is a separation or interference. When the target's “top” contact side points toward the source, the contact has initial separation. When the target's top contact side points away from the source, the contact is an interference.

The top contact side of a flexible target always points away from the elements connected to the target nodes.

For a rigid target, the order in which you select the nodes determines the top contact side. The node selection defines a vector that is crossed by the vector that points into the –Y direction relative to the axisymmetric X-Z coordinate plane. For example, if you select the target region nodes working downward (as shown by the numbers in the following graphic), the top contact side is to the right.

Rigid Contact Target Side (SURF)

With a rigid target, you can change the contact side by setting the Rigid Contact Target Side option to Top or Bottom. It is important to specify the appropriate contact side relative to the top contact side that was defined by the node selection.

In the following graphic, the white arrow indicates the top contact side of the rigid target as defined by the node selection (for this example, assume that the nodes in the target region were selected in a downward sequence, so the top contact side is pointing to the right). The Rigid Contact Target Side is set to Bottom. The red arrow represents the direction of the contact, which has an initial separation.

Rigid Contact Target Side set to Bottom

Master Grid Point (MGP)

With a rigid target, you can tie all nodes on the target to a master node that you define as a Master Grid Point. Internally, rigid links connect all the nodes on the rigid target region to this master node. You can then apply a displacement constraint or a load to this node and the entire rigid target region moves with it.

(1) Master Grid Point with displacement constraint

Where do I find it?

• In the Simulation Navigator, right-click Simulation Object Container→New Simulation Object→Advanced Axisymmetric Nonlinear Contact.

• Choose Home tab→Loads and Conditions group→Advanced Axisymmetric Nonlinear Contact

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)

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

Automatic face pairing

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Advanced nonlinear contact for axisymmetric elements (Simcenter Nastran), Simcenter 3D 2021.1 Series

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