FEM ConstraintRigidBody: Difference between revisions

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Revision as of 11:36, 18 May 2024

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FEM ConstraintRigidBody

Menu location
Model → Mechanical boundary conditions and loads → Constraint rigid body
Workbenches
FEM
Default shortcut
None
Introduced in version
1.0
See also
FEM Constraint displacement

Description

Defines the CalculiX's rigid body constraint that constrains the motion of the nodes of a selected face to the motion of a reference node whose location is defined by the user. In practice, this can be used to apply a boundary condition or load that will be propagated to the selected face. Since the reference node has rotational degrees of freedom, it's possible to apply a moment load or a rotational boundary condition to any face this way.

Usage

  1. There are several ways to invoke the command:
    • Press the Constraint rigid body button.
    • Select the Model → Mechanical boundary conditions and loads → Constraint rigid body option from the menu.
  2. In the 3D view select face(s) to which the constraint should be applied.
  3. Specify the coordinates of the reference node.
  4. Choose modes for translational and rotational degrees of freedom (DOFs):
    1. Free - default, no boundary condition or load on that DOF
    2. Constraint - displacement/rotation boundary condition with a specified value (0 = fixed by default) - for rotation, one needs to set an axis (X, Y or Z) and specify the Angle
    3. Load - force/moment load with a specified value

Limitations

Currently, the moment units can be somewhat confusing. To apply 1 N*m, one needs to set 1 J in the input field (those units are equivalent).

Notes