![]() With the AMINERTIA command, you select the cross section in the drawing and specify the direction of the load force before starting the moment of inertia calculation.The procedure for calculating the moment of inertia for the same cross section varies by commands: To calculate the moment of inertia for cross sections of cylinders, hollow cylinders, rectangular prisms, or hollow rectangular prisms, you can use the AMINERTIAPROF or AMINERTIA command.Įach command uses different algorithms for calculating the moment of inertia. ![]() Moment of inertia for circular or rectangular cross sections Note: If you change the contour of the cross section, a new calculation of the moment of inertia is carried out automatically and the moment of inertia block is also updated. The moment of inertia block, which is a table containing the results of the moment of inertia calculation, is displayed and can be inserted anywhere in the drawing. Minimum distance from the neutral line to the border of the compression side.Maximum distance from the neutral line to the border of the extension side.Effective moment of inertia that corresponds to the load direction you selected.Make also sure that the load forces you specify must be acting in the same plane. The direction of the load forces influences the result of the effective moment of inertia. In the final stage of the calculation, you specify the direction of the load forces. Angle between the horizontal line and the 1 axis, for which I1 is always the greater moment of inertia.Moment of inertia (I1 and I2) along the 1 and 2 axes.X and Y coordinates of the center of gravity of the cross section.In the next step, the program draws the principal axes, 1 and 2, for the moment of inertia and performs the moment of inertia calculation. AutoCAD Mechanical toolset fills the area, and you are asked if the filled area is the area you want to be analyzed. The cross section you select must be a closed contour. When you start the AMINERTIA command, you are prompted to select a cross section.
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