Learning Forum

[gfeng01]

I tried to run a static structural analysis to thin wall and add the eigenvalue buckling to get the load multiplier. However, when I change the applied load in static structural to ultimate buckling load solved by eigenvalue buckling, there is no buckling behavior in static deformation. I wonder if we could conduct buckling analysis in static structural so I could see stress distribution in buckling mode.

[Surya Prakash]

Eigenvalue buckling must be linked to static structural analysis. More information on eigenvalue buckling and how to perform can be found here - Eigenvalue Buckling Analysis (ansys.com)

Regards Surya
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[ErKo]

"there is no buckling behaviour in the static"
That is correct, it will just compress the structure downwards. We can do nonlinear buckling analysis using a linear static system (see here for a good description on linear and nonlinear buckling: https://enterfea.com/linear-vs-nonlinear-buckling-explained/)
To do the nonlinear static buckling analysis using a static system:
You need as mentioned to link another static system (system C below) to the eigenvalue buckling analysis (see system B below) and use the deformed first eigenvalue mode shape as imperfection (from the buckling analysis), which will then trigger buckling in the static structural analysis (system C). Always use ofcourse large deflections on with this nonlinear buckling analysis in the static system (system C below). Make sure also the scale factor as shown below is realistic and small otherwise the initial imperfections will be too large.

Thank you

Erik

[gfeng01]

Thanks for your response. I was wondering what is the scale factor and how to determine the value of it?
Regards Guodong