*morphconstraintcreatedof

Creates a constraint which fixes the x (or radial), y (or theta), and/or z degrees of freedom for the selected nodes for a given system.

Syntax

*morphconstraintcreatedof entity_type mark_id dof1 dof2 dof3 system_id options name color

Type

HyperMesh Tcl Modify Command

Description

This command creates a constraint which fixes one or more translational degrees of freedom for the selected nodes relative to either the global coordinate system or a specified local coordinate system.

A degree of freedom for a coordinate system is one of the three translational directions. For a rectangular coordinate system the three degrees of freedom are along each axis: the x-axis, the y-axis, and the z-axis. For a cylindrical coordinate system the three degrees of freedom are in the radial direction, the theta direction, and the z direction. For example, for a rectangular coordinate system, if the y-axis degree of freedom is fixed for a node, it will be allowed to move only in the x and z directions, remaining in a plane perpendicular to the y axis. Similarly, for a cylindrical coordinate system, if the theta degree of freedom is fixed for a node, it can move only in the radial and z directions. Note that fixing the radial and z degrees of freedom for a cylindrical coordinate system will force a node to move in a circle about the axis of that system.

Inputs

entity_type: Must be set to nodes.
mark_id: The mark ID for the constrained nodes. Valid values are 1 and 2.
dof1: 0 - Allow the nodes to move in the x (or radial) direction; 1 - Constrain the nodes from moving in the x (or radial) direction
dof2: 0 - Allow the nodes to move in the y (or theta) direction; 1 - Constrain the nodes from moving in the y (or theta) direction
dof3: 0 - Allow the nodes to move in the z direction; 1 - Constrain the nodes from moving in the z direction
system_id: The ID of the local coordinate system. Use 0 for the global coordinate system.
options: 0 - Does not affect nodes near constrained nodes; 1 - Enable mesh stretching around constrained nodes
name: The name of morph constraint.
color: The color of the constraint. Valid values are 1-64.

Example

To create a DOF constraint named "mconsystem5" for nodes 1-100 in the radial direction of a local coordinate system with ID 5 and mesh stretching enabled:

*createmark nodes 1 1-100
*morphconstraintcreatedof nodes 1 1 0 0 5 1 "mconsystem5" 22

Errors

Incorrect usage results in a Tcl error. To detect errors, you can use the catch command:

if { [ catch {command_name...} ] } {
   # Handle error
}

Version History

14.0.110