Fixed constraint

A fixed constraint prevents the target face, edge, or vertex from moving or deforming in response to a load. In its default setup, the fixed constraint prevents all movement or deformation on the selected entity by constraining all 3 translational. A fully constrained model eliminates rigid body movement.

With the fixed constraint, three axis buttons define which directions are fixed. By default, all directions are fixed, so all buttons are selected.

Displacement results using fixed and remote constraints

	A beam showing the displacement when a fixed constraint is applied to one end and a load is applied to the other.
	If you fix all six degrees of freedom - Ux, Uy, Uz and Rx, Ry, and Rz, using a remote constraint, then it behaves like a fixed constraint. The remote constraint fixes a node (think of it as a rigid body) to the face with rigid links. If the node does not displace nor rotate at all, you have in effect a completely rigid connection.

Figure 1: Displacement result showing that (a) a fixed constraint, and (b) a remote constraint in which all 6 degrees of freedom are fixed, create the same effect.