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. The following values are displayed.Įffective 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. Moment of inertia (I1 and I2) along the 1 and 2 axes.Īngle between the horizontal line and the 1 axis, for which I1 is always the greater moment of inertia. For non-circular shapes, the process you described (moving centroid to. It just depends on which numbers to pay attention to. Moments of inertia The mass moments of inertia, which is used when computing the force required to rotate an object about a given axis, such as a wheel rotating about an axle. It also gives the directions of the principle axes. X and Y coordinates of the center of gravity of the cross section. Massprop should actually be giving both the moments of inertia about the x and y centroidal axes through 0,0 AND the principal moments of inertia about its own centroid. 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 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. Anyone use the AMINERTIA command like I am trying to that can point out what I am missing?
Can it calculate the moment of inertia in any direction? The Autocad help file implies that it can, but I don't see the "effective" moment of inertia in the load direction after I run the command. I need to find the moment of inertia for an odd-shaped "beam." I am using the AMINERTIA command in Autocad Mechanical, but it seems to only calculate moments of inertia about the principal axes.
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