da#

SolidConstraints.da(area='', lab='', value1='', value2='', **kwargs)#

Defines degree-of-freedom constraints on areas.

Mechanical APDL Command: DA

Parameters:
areastr

Area on which constraints are to be specified. If ALL, apply to all selected areas ( asel ). If AREA = 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 AREA.

labstr

Symmetry label (see da_LabFootnotes_1 below) :

  • SYMM - Generate symmetry constraints. Requires no Value1 or Value2.

  • ASYM - Generate antisymmetry constraints. Requires no Value1 or Value2.

Mechanical APDL degree-of-freedom labels:

  • UX - Displacement in X direction.

  • UY - Displacement in Y direction.

  • UZ - Displacement in Z direction.

  • ROTX - Rotation about X axis.

  • ROTY - Rotation about Y axis.

  • ROTZ - Rotation about Z axis.

  • HDSP - Hydrostatic pressure.

  • PRES - Pressure.

  • TEMP, TBOT, TE2, TE3, ..., TTOP - Temperature.

  • MAG - Magnetic scalar potential (see da_LabFootnotes_2 below).

  • VOLT - Electric scalar potential (see da_LabFootnotes_3 below).

  • AZ - Magnetic vector potential in Z direction (see da_LabFootnotes_4 below).

  • CONC - Concentration.

  • ALL - Applies all appropriate degree-of-freedom labels except HDSP.

This command contains some tables and extra information which can be inspected in the original documentation pointed above.

value1str

Value of degree of freedom or table name reference on the area. Valid for all degree-of-freedom labels. To specify a table, enclose the table name in % signs (for example, da, AREA,TEMP,``tabname``). Use the dim command to define a table.

value2str

For MAG and VOLT degrees of freedom:

Value of the imaginary component of the degree of freedom.

Notes

You can transfer constraints from areas to nodes via dtran or sbctran. See dk for information about generating other constraints on areas.

Tabular boundary conditions ( VALUE = tabname) are available only for the following degree- of-freedom labels: Electric (VOLT), Structural (UX, UY, UZ, ROTX, ROTY, ROTZ), Acoustic (PRES, UX, UY, UZ), and temperature (TEMP, TBOT, TE2, TE3,…, TTOP).

Constraints specified by the da command can conflict with other specified constraints. See Resolution of Conflicting Constraint Specifications in the Basic Analysis Guide for details.

This command is also valid in PREP7.