Calculating the Moment of Inertia

Use the AM_InertiaProf command to calculate the moment of inertia for the following cross sections:

  • Cylinders

  • Hollow cylinders

  • Rectangular prisms

  • Hollow rectangular prisms

The command opens the Construction Lines dialog box where you can select the cross section.

To calculate the moment of inertia, specify the dimension values for the specified cross section. The command displays the result of moment of inertia calculation in a table.

Specify the dimension values for the selected cross section to obtain the moment of inertia.

The following values are displayed:

Option

Description

I1

Moment of inertia along the first main axis

I2

Moment of inertia along the second main axis

Sc

Distance of the outermost fiber in compression from the neutral axis

St

Distance of the outermost fiber in tension from the neutral axis

A

Calculated area of the specified cross section

To calculate a moment of inertia:

  1. Do one of the following:

    • On the ribbon, click Mechanical Content > Calculations > Predefined Profile Sections > Create.

    • On the menu, click Mechanical Content > Calculations > Predefined Profile Sections.

    • Type AM_InertiaProf.

  2. In the dialog box, click the icon corresponding to the type of profile section to which you want to calculate the moment of inertia.

  3. Click OK.

  4. Follow the steps to define the cross section for which you want to calculate the moment of inertia.

  5. Specify the Highlight option and press Enter.

    Dimensions with dimension text overrides are highlighted.

    Icon

    Cross Section

    Alternative Command

    Description

    ico_inert_rect

    Rectangular cross section

    AM_Inertia_Rectangular

    Calculates the moment of inertia for the cross section of a rectangular prism.

    ico_inert_tuberect

    Rectangular tube cross section

    AM_Inertia_TubeRectangular

    Calculates the moment of inertia for the cross section of a rectangular tube.

    ico_inert_circ

    Circular cross section

    AM_Inertia_Circular

    Calculates the moment of inertia for the cross section of a cylinder.

    ico_inert_tubecirc

    Circular tube cross section

    AM_Inertia_TubeCircular

    Calculates the moment of inertia for the cross section of tube.

Access

Command: AM_InertiaProf

Menu: Mechanical Content > Calculations > Predefined Profile Sections

Ribbon: Mechanical Content > Calculations > Predefined Profile Sections > Create

Parent Topic

Mechanical Utilities