FEM ElementGeometry1D
Appearance
|
|
| Menu location |
|---|
| Model → Element Geometry → Beam Cross Section |
| Workbenches |
| FEM |
| Default shortcut |
| C B |
| Introduced in version |
| - |
| See also |
| FEM tutorial |
| Solvers |
|---|
| CalculiX, Mystran, Z88 |
Description
ElementGeometry1D is used to define cross sections for beam elements. Currently, the following types of cross sections are available: rectangular, circular and pipe.
1.1 and above: Box and elliptical cross sections are also available.
Usage
- There are several ways to invoke the command:
- Press the
Beam Cross Section button.
- Select the Model → Element Geometry →
Beam Cross Section option from the menu.
- Press the
- Choose the type of cross section and specify the necessary dimensions:
- Rectangular: width and height,
- Circular: diameter,
- Pipe: outer diameter and thickness,
- 1.1 and above: Elliptical: axis 1 length and axis 2 length,
- 1.1 and above: Box: width, height, thicknesses T1 - T4.
- Optionally, press the Add button in the task panel and then click on the edge you want to have a prescribed cross section. If the edge selection is free, all the remaining edges (whose cross section is not defined by other FEM ElementGeometry1D objects) will be automatically assigned. introduced in 1.1: To remove edges from the selection, press the Remove button.
Beam section types, local axes used by CalculiX and dimensions specified in FreeCAD FEM
Properties
- DataSection Type: specifies the type of the beam section (Rectangular, Circular, Pipe, 1.1 and above: Elliptical and Box)
- 1.1 and above: DataBox Height: height of box section, used if DataSection Type is Box
- 1.1 and above: DataBox T1: thickness T1 of box section, used if DataSection Type is Box
- 1.1 and above: DataBox T2: thickness T2 of box section, used if DataSection Type is Box
- 1.1 and above: DataBox T3: thickness T3 of box section, used if DataSection Type is Box
- 1.1 and above: DataBox T4: thickness T4 of box section, used if DataSection Type is Box
- 1.1 and above: DataBox Width: width of box section, used if DataSection Type is Box
- DataCirc Diameter: diameter of circular section, used if DataSection Type is Circular
- 1.1 and above: DataAxis 1 Length: lenth of axis 1 of elliptical section, used if DataSection Type is Elliptical
- 1.1 and above: DataAxis 2 Length: lenth of axis 2 of elliptical section, used if DataSection Type is Elliptical
- DataPipe Diameter: outer diameter of pipe section, used if DataSection Type is Pipe
- DataPipe Thickness: thickness of pipe section, used if DataSection Type is Pipe
- DataRect Height: height of rectangular section, used if DataSection Type is Rectangular
- DataRect Width: width of rectangular section, used if DataSection Type is Rectangular
- 1.1 and above: DataTruss Area: cross-sectional area of truss elements, used if DataExclude Bending Stiffness is enabled in the CalculiX solver
Limitations
- 1.0 and below: Other types of cross sections available in CalculiX (elliptical, box and general) are not currently supported. One can edit the input file to use them.
- 1.1 and above: General beam section is not currently supported. One can edit the input file to use it.
Notes
- For viewing results from CalculiX solver on the mesh expanded to the prescribed cross section, property
Beam Shell Result Output 3Din the FEM SolverCalculixCcxtools needs to be set toTrue. - Some sections require specific element types:
- circular section - 2nd order elements
- pipe section - 2nd order elements with reduced integration (introduced in 1.0: reduced integration is enabled by default for beam elements and can be switched using the Beam Reduced Integration property of the CalculiX solver)
- 1.1 and above: elliptical section - 2nd order elements
- 1.1 and above: box section - 2nd order elements with reduced integration (as explained above)
- This feature uses the *BEAM SECTION card in CalculiX. The direction of the local axis 1 is automatically determined by FreeCAD FEM and written as the direction vector in the second data line of this keyword.
- Materials: Solid Material, Fluid Material, Non-Linear Mechanical Material, Reinforced Material (Concrete); Material Editor
- Element Geometry: Beam Cross Section, Beam Rotation, Shell Plate Thickness, Fluid Section for 1D Flow
- Electromagnetic Boundary Conditions: Electrostatic Potential Boundary Condition, Current Density Boundary Condition, Magnetization Boundary Condition, Electric Charge Density
- Fluid Boundary Conditions: Initial Flow Velocity Condition, Initial Pressure Condition, Flow Velocity Boundary Condition
- Geometrical Analysis Features: Plane Multi-Point Constraint, Section Print Feature, Local Coordinate System
- Mechanical Boundary Conditions and Loads: Fixed Boundary Condition, Rigid Body Constraint, Displacement Boundary Condition, Contact Constraint, Tie Constraint, Spring Boundary Condition, Force Load, Pressure Load, Centrifugal Load, Gravity Load
- Thermal Boundary Conditions and Loads: Initial Temperature, Heat Flux Load, Temperature Boundary Condition, Body Heat Source
- Overwrite Constants: Constant Vacuum Permittivity
- Mesh: Mesh From Shape by Netgen, Mesh From Shape by Gmsh, Mesh Boundary Layer, Mesh Refinement, Mesh Group, Erase Elements, FEM Mesh to Mesh
- Solve: Solver CalculiX, Solver Elmer, Solver Mystran, Solver Z88; Mechanical Equations: Elasticity Equation, Deformation Equation; Electromagnetic Equations: Electrostatic Equation, Electricforce Equation, Magnetodynamic Equation, Magnetodynamic 2D Equation, Static Current Equation; Flow Equation, Flux Equation, Heat Equation, Solver Job Control, Run Solver
- Results: Purge Results, Show Result, Apply Changes to Pipeline, Post Pipeline From Result, Pipeline Branch, Warp Filter, Scalar Clip Filter, Function Cut Filter, Region Clip Filter, Contours Filter, Glyph Filter, Line Clip Filter, Stress Linearization Plot, Data at Point Clip Filter, Calculator Filter; Filter Functions: Plane, Sphere, Cylinder, Box; Data Visualizations: Create Lineplot, Create Histogram, Create Table
- Utilities: Clipping Plane on Face, Remove All Clipping Planes, FEM Examples; Clear FEM Mesh, Display Mesh Info
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
- 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, Material, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub