# FEM ElementGeometry1D

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Menu location FEM ElementGeometry1D Model → Element Geometry → Beam cross section FEM C B - FEM tutorial

## Description

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

## Usage

1. There are several ways to invoke the command:
• Press the 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.
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 remaining edges (whose cross section is not defined by other FEM ElementGeometry1D objects) will be automatically assigned.

## Properties

• DataSection Type: specifies the type of the beam section (Rectangular, Circular or Pipe)
• DataCirc Diameter: diameter of circular section, used if DataSection Type is Circular
• 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

## Limitations

• 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.

## 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 (introduced in version 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)
• This feature uses the *BEAM SECTION card in CalculiX.