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Revision as of 11:36, 18 May 2024
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
- 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.
- In the 3D view select face(s) to which the constraint should be applied.
- Specify the coordinates of the reference node.
- Choose modes for translational and rotational degrees of freedom (DOFs):
- Free - default, no boundary condition or load on that DOF
- 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
- 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
- This feature uses the *RIGID BODY card in CalculiX.
FEM
- Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor
- Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)
Constraints
- Electromagnetic: Electrostatic potential, Current density, Magnetization
- Geometrical: Plane rotation, Section print, Transform
- Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight
- Thermal: Initial temperature, Heat flux, Temperature, Body heat source
- Overwrite Constants: Constant vacuum permittivity
- Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run
- Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
User documentation
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
- Workbenches: Std Base, Assembly, BIM, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub