The objective of this work is to predict the plate elastic buckling includes
critical buckling load and corresponding buckling mode for stiffened and unstiffened
plate under in-plane loading. The numerical study has been achieved by
employing the FEM (ANSYS package ver.11) using a shell element of eight nodes
with five DOF at each node as a discretization element such that the equation of
elastic stability with isotropic material properties has been taken into consideration
The study of aluminum alloy 6063-O plates subjected to in-plane loading showing
the effect of stiffened plates, stepped thickness, and changing of applied loading. It
has been found that buckling strength increases when plate width (b) increase for
stiffened and unstiffened plate, also critical buckling load has high values for
biaxial load than uniaxial for plates with the same specification. Also, an
experimental test has been performed on different cases which exhibit a good
verification of results.