Fixed Constraint (Rigid Material)
The Fixed Constraint node adds a condition that makes the entire rigid domain fixed (fully constrained). The displacements and rotations are zero in all directions. There are no settings for this node. See Rigid Material.
The Fixed Constraint and Prescribed Displacement/Rotation subnodes cannot be combined for a Rigid Material.
Reaction Force Settings
Select Evaluate reaction forces to compute the reaction force caused by the constraint. The default is to not compute the reaction force. When selected, the constraint is implemented as a weak constraint.
Select Apply reaction only on rigid body variables to use a unidirectional constraint for enforcing the prescribed motion. The default is that bidirectional constraints are used. For a fixed constraint, there is no effect of changing this setting.
You can activate and deactivate the fixed constraint by assigning it to a constraint group. See Load Cases in the Structural Mechanics Modeling chapter.
Location in User Interface
Context Menus
Solid Mechanics>Rigid Material>Fixed Constraint
Shell>Rigid Material>Fixed Constraint
Layered Shell>Rigid Material>Fixed Constraint
Beam>Rigid Material>Fixed Constraint
Pipe Mechanics>Rigid Material>Fixed Constraint
Multibody Dynamics>Rigid Material>Fixed Constraint
Ribbon
Physics tab with Rigid Material node selected in the model tree:
Attributes>Fixed Constraint
When this node has been added once, it is no longer available for selection in the context menu or ribbon.