Problem in FEA: Column is not buckling?

Altair Forum User

Hi all,

 

I have a column in my model and it is not buckling in the FEA analysis, rather getting compressed. The load is being applied uniaxially with respect to the column.

 

Is there a way I can make the column buckle? In ABAQUS, we introduce imperfection in the column by deviating the geometry by a little bit based on buckling modes (scaled by 0.5 to 1%). I was wondering if we can do the same in Inspire since there is an option for buckling mode calculation during FE analysis.

 

<?xml version="1.0" encoding="UTF-8"?>

Simon Križnik

Hi,

 

you can get a column to buckle by introducing imperfections in:

-geometry

-loads (small off-axis load component)

However, I don't think non-linear buckling analysis can be done in Inspire because it uses a linear solver. It can be done using Optistruct or Radioss.

 

Actually, linear buckling analysis does not require imperfections, because a small displacement of a perturbed shape is assumed in each element that induces a stress-dependent stiffening effect:

https://www.digitalengineering247.com/article/linear-and-nonlinear-buckling-in-fea/