Unless I am missing something, the results of *BUCKLE do not contain the buckling mode information (only the buckling factors), and I need this information to estimate the effect of imperfections. It does not seem possible to arrange for output of the buckling modes directly and it should be done somewhere at the level of ARPACK. Is this correct? If it is, I would much appreciate some advice on how to do it easier. At the moment it seems to me that I would need to output some eigenvectors in ARPACK.
If you add this to the input file (under *BUCKLE), you will get mode shapes as well (in the .frd file):
*NODE FILE
U
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Thank you very much indeed! This was difficult to find in the manual.