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This is Fig. 48 from the 1987 PANDA2 paper. This slide shows load-end-shortening for a uniformly axially compressed, blade-stiffened flat panel.
The local buckling pattern has five axial half-waves. The STAGS result shows more axial stiffness than the PANDA2 prediction because the STAGS model has stringers at each edge (four stringers in a width of 24 inches), whereas the PANDA2 model has three stringers (three modules) in the width of 24 inches.
(from Computers & Structures, Vol.25, No.4, pp. 469-605, 1987)
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