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This is Fig. 6 from the paper, "Optimization of composite, stiffened, imperfect panels under combined loads for service in the postbuckling regime" by David Bushnell, Computer Methods in Applied Mechanics and Engineering, Vol. 103, pp. 43-114, 1993, called "1993 postbuckling paper" in several other slides.
This slide shows the postbuckling behavior of an axially compressed imperfect unstiffened flat plate with anti-symmetry (simple support) imposed along the mid-width of the plate and "moving" symmetry imposed along the two longitudinal edges of the plate.
This rather unusual representation of a flat plate is used in order to permit direct comparison of results from PANDA2 and STAGS. In PANDA2's local buckling and post-buckling model antisymmetry is imposed at the mid-width of a single discretized skin-stringer module. In this unstiffened plate case the same PANDA2 model is used except that there is no stringer.
The unstiffened plate is loaded far into its post-buckled state.
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