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Displacement Constraint

In one sentence: Prescribe the displacement or rotation of a face, edge, or vertex to a specific value — including zero (fixed in that direction) or a non-zero prescribed deformation.

Overview

Workbench: FEM
Menu: FEM → Model → Mechanical Boundary Conditions → Displacement Constraint

Prescribes the displacement (and/or rotation) of a geometric entity. Each of the six DOF can independently be free, fixed at zero, or set to a prescribed non-zero value.

Parameters

DOF Meaning Example use
x Translation in X Fix X only — allows Y, Z sliding
y Translation in Y —
z Translation in Z Fix Z only — roller support
Rx Rotation about X Fix rotation — pinned joint
Ry Rotation about Y —
Rz Rotation about Z —

Free — not constrained
Fixed (= 0) — zero displacement/rotation
Prescribed — specific non-zero value

Example: Roller support

  • x: Free (slides)
  • y: Fixed (0)
  • z: Fixed (0)
  • Rx, Ry, Rz: Free

See also