1D connection elements for kinematic joints

The CJOINT element is the Simcenter Nastran 1D element that defines kinematic joints. You can select it when you realize (mesh) universal connections, and you use it to create kinematic joints manually.

The CJOINT element connects two nodes, a source node and a target node. You can configure the CJOINT from its mesh collector and from the mesh-associated data for each mesh in the collector. For each individual element, you can override the physical properties and orientation in the element associated data.

• From the Cjoint Collector, you can set the following physical properties:Type of joint (PJOINT)Note: When you realize a kinematic universal connection, the type of joint is automatically specified based on the type of kinematic connection you created. You can change the joint type in the Cjoint Collector, but if you realize the kinematic connection again, the joint type is reset.Friction (PJOINT)Note: If you specify friction in a kinematic universal connection, the friction settings are automatically added to the PJOINT when you realize the connection. You can change the friction settings in the Cjoint Collector, but if you realize the kinematic connection again, the friction settings are reset.Stiffness (PJOINT2)Spring and damping (PJOINT2)

• For each mesh in the Cjoint Collector, you can set the following:Orientation, which can be overwritten at the element-associated data level.Control node, which cannot be overwritten at the element-associated data level.Note: Control nodes are intended for advanced users. For more information, see Control nodes.

Creating kinematic joints

You can create kinematic joints manually by creating 1D connection elements, but the recommended method for creating joints is to use universal connections as explained in Add joints to your kinematics model using universal connections.

To create 1D connection joint elements manually, you can use the following commands at the FEM and AFEM level:

• 1D Connection command

• Element Create command

Note:

• The 1D connection joint elements must connect nodes (Node to Node) or points (Point to Point).

• Do not use the 1D Mesh command to create the 1D joint elements. The 1D Mesh command meshes edges, but the joint works only with node or point connections.

When you create 1D connection joint elements manually, you can assign the control node in the 1D Connection or Element Create dialog box by clicking Edit Mesh Associated Data and selecting the control node on the Mesh Associated Data dialog box.

Where do I find it?

Creating a kinematic joint using 1D connection elements

Application	Pre/Post
Prerequisite	A FEM or assembly FEM file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis typeSOL 402 Multi-Step Nonlinear Kinematics as the specified solution type
Command Finder	1D Connection orElement Create
Simulation Navigator	Right-click Connection Collectors→New Connection→Connection

Defining physical properties for a CJOINT

Application	Pre/Post
Prerequisite	A FEM or assembly FEM file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis typeSOL 402 Multi-Step Nonlinear Kinematics as the specified solution type
Simulation Navigator	Right-click Cjoint Collector→Edit

Defining element associated data for a CJOINT

Application	Pre/Post
Prerequisite	A FEM or assembly FEM file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis typeSOL 402 Multi-Step Nonlinear Kinematics as the specified solution type
Command Finder	Associated Data
Dialog box location	Type list→Spring-Damper / Kinematic Joint

How do I

Add joints to your kinematics model using universal connections

Create a flexible slider joint

Create and assign control nodes

Learn more

SOL 402 structural analysis with kinematics

Kinematic Driver boundary condition

Joint Time Constraint boundary condition

Flexible slider joint

Control nodes

Look up more details

Kinematic joints for SOL 402

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Command reference

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1D connection elements for kinematic joints, Simcenter 3D 2021.1 Series

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