Deletes degree-of-freedom constraints.

Compatible Products: – | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA


Node for which constraint is to be deleted. If ALL, NEND and NINC are ignored and constraints for all selected nodes [NSEL] are deleted. If NODE = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for NODE.


Valid degree of freedom label. If ALL, use all selected labels [DOFSEL]. Structural labels: UX, UY, or UZ (displacements); ROTX, ROTY, or ROTZ (rotations); WARP (warping). Thermal labels: TEMP, TBOT, TE2, TE3, . . ., TTOP (temperature). Acoustic labels: PRES (pressure); UX, UY, or UZ (displacements for FSI coupled elements). Electric label: VOLT (voltage). Magnetic labels: MAG (scalar magnetic potential); AZ (vector magnetic potential). Diffusion label: CONC (concentration).

In structural analyses, the following velocity and acceleration load labels are also valid: VELX, VELY, VELZ (translational velocities); OMGX, OMGY, OMGZ (rotational velocities); ACCX, ACCY, ACCZ (translational accelerations); DMGX, DMGY, DMGZ (rotational accelerations).

In structural analyses, HDSP (hydrostatic pressure) is also valid.

If the node is connected to an ELBOW290 element, the following pipe cross-section degree of freedom labels are also valid: SE, SO, SW, SRA, and SRT. (For details, see the ELBOW290 documentation.) The degrees of freedom are not included when Lab = ALL. To constrain all cross-section degrees of freedom, specify Lab = SECT.


Delete constraints from NODE to NEND (defaults to NODE) in steps of NINC (defaults to 1).


Ramping key:



Loads are step-removed (default).



Forces on the specified degrees of freedom (Lab) are ramped during the next load step. The forces are ramped from the reaction forces of the previous load step, regardless of whether or not a constraint was present. If the specified node(s) and degree(s) of freedom has a force value currently defined, the force is ramped from the reaction force value to the currently applied force value. If no force is currently applied, the force is ramped from the reaction force value to zero. The ramping behavior is not in effect if the subsequent force is applied in tabular format.

In performing a restart at an intermediate point during a load step (i.e., not at the beginning or end of a load step), the reaction force information will not be available, and so the force will be ramped from zero to the currently applied force value (if it exists) for the specified node(s) and degree(s) of freedom.


Deleting a constraint is not the same as setting it to zero (which "fixes" the degree of freedom to a zero value). Deleting a constraint has the same effect as deactivating, releasing, or setting the constraint "free." The node and the degree of freedom label must be selected [NSEL, DOFSEL].

This command is also valid in PREP7.

Menu Paths

Main Menu>Preprocessor>Loads>Define Loads>Delete>All Load Data>All Constraint>On All Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Electric>Boundary>PerfEC>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Electric>Boundary>TimeInt>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Electric>Boundary>Voltage>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Fluid/ANSYS>Pressure DOF>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Magnetic>Boundary>EdgeMVP>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Magnetic>Boundary>ScalarPot>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Magnetic>Boundary>VectorPot>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Structural>Displacement>On Node Components
Main Menu>Preprocessor>Loads>Define Loads>Delete>Structural>Displacement>On Nodes
Main Menu>Preprocessor>Loads>Define Loads>Delete>Thermal>Temperature>On Nodes
Main Menu>Preprocessor>LS-DYNA Options>Constraints>Delete>On Nodes
Main Menu>Solution>Constraints>Delete>On Nodes
Main Menu>Solution>Define Loads>Delete>All Load Data>All Constraint>On All Nodes
Main Menu>Solution>Define Loads>Delete>Electric>Boundary>PerfEC>On Nodes
Main Menu>Solution>Define Loads>Delete>Electric>Boundary>TimeInt>On Nodes
Main Menu>Solution>Define Loads>Delete>Electric>Boundary>Voltage>On Nodes
Main Menu>Solution>Define Loads>Delete>Fluid/ANSYS>Pressure DOF>On Nodes
Main Menu>Solution>Define Loads>Delete>Magnetic>Boundary>EdgeMVP>On Nodes
Main Menu>Solution>Define Loads>Delete>Magnetic>Boundary>ScalarPot>On Nodes
Main Menu>Solution>Define Loads>Delete>Magnetic>Boundary>VectorPot>On Nodes
Main Menu>Solution>Define Loads>Delete>Structural>Displacement>On Node Components
Main Menu>Solution>Define Loads>Delete>Structural>Displacement>On Nodes
Main Menu>Solution>Define Loads>Delete>Thermal>Temperature>On Nodes

Release 18.2 - © ANSYS, Inc. All rights reserved.