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  1. stjc

    Buckling cellular structures - negative eigenvalues

    I'm investigating buckling of cellular structures and started off with a simple two-cell case which worked as expected. I've started effectively building up combinations of these two cell units but even by the time I get to a six-cell structure I get negative eigenvalue results. Whenever this...
  2. stjc

    Displacement output from buckle step

    I understand that eigenvectors/mode shapes are normalised but for a given load and buckling mode, you can calculate displacements by hand so should it not be possible to also find this from the FE model? I'm trying to verify my model, starting with simple cases such as square plates with a...
  3. stjc

    Displacement output from buckle step

    I'm doing an eignenvector buckling analysis for a box girder bridge and am using the buckle linear perturbation load. The displacements for the deformations all come out as fractions of the maximum. How do I find the actual displacements? Thanks.

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