GuiCommand:Container| {{GuiCommand Name: FEM ElementGeometry1D MenuLocation: Model , Element Geometry , Beam cross section Workbenches: FEM_Workbench Shortcut: C B SeeAlso: FEM_tutorial }} {{GuiCommandFemInfo Solvers: CalculiX, Mystran, Z88 }}

FEM ElementGeometry1D

Description

ElementGeometry1D is used to define cross sections for beam elements. Currently, the following types of cross sections are available: rectangular, circular and pipe.

(v1.1)

: Box and elliptical cross sections are also available.

Usage

1. 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.

2. Choose the type of cross section and specify the necessary dimensions:

   • Rectangular: width and height,

   • Circular: diameter,

   • Pipe: outer diameter and thickness,

   • (v1.1)

     : Elliptical: axis 1 length and axis 2 length,

   • (v1.1)

     : Box: height, width, thickness T1 - T4.

3. 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.

Properties

• Section Type: specifies the type of the beam section (Rectangular, Circular, Pipe, (v1.1) : Elliptical and Box)

• (v1.1) : Box Height: height of box section, used if Section Type is Box

• (v1.1) : Box T1: thickness T1 of box section, used if Section Type is Box

• (v1.1) : Box T2: thickness T2 of box section, used if Section Type is Box

• (v1.1) : Box T3: thickness T3 of box section, used if Section Type is Box

• (v1.1) : Box T4: thickness T4 of box section, used if Section Type is Box

• (v1.1) : Box Width: width of box section, used if Section Type is Box

• Circ Diameter: diameter of circular section, used if Section Type is Circular

• (v1.1) : Axis 1 Length: lenth of axis 1 of elliptical section, used if Section Type is Elliptical

• (v1.1) : Axis 2 Length: lenth of axis 2 of elliptical section, used if Section Type is Elliptical

• Pipe Diameter: outer diameter of pipe section, used if Section Type is Pipe

• Pipe Thickness: thickness of pipe section, used if Section Type is Pipe

• Rect Height: height of rectangular section, used if Section Type is Rectangular

• Rect Width: width of rectangular section, used if Section Type is Rectangular

Limitations

• {{VersionMinus|1.0}}: 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.

• (v1.1) : 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 3D in the FEM SolverCalculixCxxtools needs to be set to True.

• Some sections require specific element types:

  • circular section - 2nd order elements

  • pipe section - 2nd order elements with reduced integration ((v1.0) : reduced integration is enabled by default for beam elements and can be switched using the Beam Reduced Integration property of the CalculiX solver)

  • (v1.1)

    : elliptical section - 2nd order elements

  • (v1.1)

    : box section - 2nd order elements with reduced integration (as explained above)

• This feature uses the *BEAM SECTION card in CalculiX.

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This page is retrieved from https://github.com/FreeCAD/FreeCAD-documentation/blob/main/wiki/FEM_ElementGeometry1D.md