psi_x missing check for negative value under root

[theScriptingEngineer]

Hi @audunarn,

Is it possible the psi_x on line 1471 in calc_structure.py is missing the check for negative value in the sqrt?
a few lines further psi_y has this check.

Regards Frederik

[audunarn]

Hi @theScriptingEngineer,
This check is actually not included in the "BUCKLING OF STIFFENED PLATE PANEL" excel sheets. However, I think it makes sense to add the check for both. Have you encountered negative values when running the code?

[theScriptingEngineer]

Hi @audunarn,

I did indeed encounter negative values when running the code (rather rare, but happened, hence me noticing).
It will only happen for checks which will result in too high UC's when I look at the formula but I'm running the code on FEA results.

Regards,
Frederik