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The subject of the research was a thin-walled plate weakened by a cut-out, made of carbon-epoxy
laminate, subjected to compression. The study included analysis of the critical and weakly post-
critical behaviour using experimental and numerical methods. As the result of the research conducted
on physical plates, a post-critical equilibrium paths, which were then used to determine the critical
loads by approximation methods, were determined. Simultaneously, numerical calculations with finite
element method were performed, using linear analysis of eigenvalue problems, which the results led
to determination of the critical loads for the developed numerical model. The second step of the
calculations included the performing of nonlinear analysis of the structure with initiated geometrically
imperfection corresponding to the flexural-torsional buckling mode of the plate. The numerical results
were compared with the experimental funding, revealing that the developed numerical model of the
structure was correct. The numerical simulations were performed using the ABAQUS®software.
