Prescribed Displacement

The node adds a condition where the displacements are prescribed in one or more directions to the geometric entity (domain, boundary, edge, or point).

If a displacement is prescribed in one direction, this leaves the solid free to deform in the other directions.

You can also define more general displacements as a linear combination of the displacements in each direction.

	If a zero displacement is applied in all directions, this is the same as a Fixed Constraint.

	For details, see Prescribed Displacements, Velocities, and Accelerations.

This section is only present in the in the Layered Shell interface, where it is described in the documentation for the Prescribed Displacement and Prescribed Displacement, Interface nodes.

Define the prescribed displacements using a (the default) or a .

To define the displacements individually, click the button.

Select one or all of the ,, and for 3D components, check boxes. Then enter a value or expression for u0, v0, and for 3D components, w0. For 2D axisymmetric components, select one or both of the and check boxes. Then enter a value or expression for u0 and w0.

Click the to specify the displacements using a general notation that includes any linear combination of displacement components. For example, for 2D components, use the relationship

For Hmatrix H select , , , or and then enter values as needed in the field or matrix. Enter values or expressions for the Rvector R.

For example, to achieve the condition u = v, use the settings

which force the domain to move only diagonally in the xy-plane.

To display this section, click the button (

) and select . Location in User Interface

	When Individual dependent variables is selected in the Apply reaction terms on drop-down list, the constraint forces are applied directly on the degrees of freedom, which are the displacements along the global coordinate axes. If you use this setting together with a local coordinate system, the results will be inconsistent since the constraint forces will not match the constraint orientation.

(Boundary)
(Edge)
(Edge)
(Edge)
(Point)
(Boundary)

Physics tab with selected: