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Design Study - Targeting Exact Moment of Inertia of Area

Question asked by Aaron Gradeen on Oct 13, 2017
Latest reply on Oct 17, 2017 by Aaron Gradeen

Hey Guys,

I'm trying to use a design study to optimize geometry so a cross section has a moment of area that's equal to a certain value. For simplicity, let's say I'm changing wall thickness in hollow structural steel with a rectangular cross section (height and width will remain constant again for simplicity). I believe I need to insert a global variable which equates the second moment of area based on the extrusion sketch dimensions. Is there a better way to do this?

I reference the I_x variable above in my design study.

When I run the optimization, the global variable I_x doesn't update so there's no convergence to the solution.

You can see I_x remains constant even though the wall thickness is changing. This is obviously an error. Can anyone think of a better way to approach this? Solving for the wall thickness directly would be an option but I would like to work with various other types of cross sections that would all need unique equations.