Creating Ax, Iy, Iz Sections in Robot

[Anonymous]

In creating a new Ax, Iy, Iz type bar section, the user is presented with a dialogue box of the various section properties.  Ax = cross sectional area, Iy and Iz are the moment of inertia of the cross section about the y & z axis, etc.  Not sure what Ix represents if the member x axis is the longitudinal axis but Robot wants all the fields filled in.  The help menu for section properties simply refers to Ix as the moment of inertia.

Thanks

[Anonymous · Accepted solution]

It's the torsional moment of inertia, or J as normally referred to here in Australia.

[Anonymous]

Ah yes, I know J as the St. Venant torsional constant.  Thanks.