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This and the next 8 slides demonstrate the important concept of the "discretized single-module skin-stiffener model" used in PANDA2, especially for local buckling and local post-buckling behavior.
This is Fig. 2 from the paper, "PANDA2 - Program for minimum weight design of stiffened, composite, locally buckled panels" by David Bushnell, Computers & Structures, Vol.25, No.4, pp. 469-605, 1987, called "1987 PANDA2 paper in several slides to be shown.
Displayed here is a panel with three T-shaped stiffeners. There are three skin-stiffener modules in this example. The local buckling and postbuckling analyses are based on a segmented single module of this panel, such as those displayed in the next 8 slides.
The general buckling analysis is based on a model in which the stiffeners are smeared out with the effect of stiffener eccentricity retained and (if the PANDA2 user so chooses) also from a single discretized module "wide-column" buckling model.
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