DDELE, NODE, Lab, NEND, NINC, Rkey
Deletes degree-of-freedom constraints.
NODENode 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.
LabValid 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.
NEND, NINCDelete constraints from NODE to NEND (defaults to NODE) in steps of NINC (defaults to 1).
RkeyRamping key:
OFF | — | Loads are step-removed (default). |
ON or FORCE | — | Forces on the specified degrees of freedom
( 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.