I am teaching a course in finite element analysis in a mechanical engineering department. It is mostly theoretical, but I am using COMSOL for lab exercises. We are starting with truss analysis, not such a common application in COMSOL but class is just up to 1D theory now. Question: in linear buckling analysis for a truss structure in 2D, how can I input I, the cross section 2nd moment of area? Cross-sectional area can be specified, but what does COMSOL use to calculate buckling factor? I cannot find anywhere to input I and no information in documentation. Thanks for any help.
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