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This is Fig. 3 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 slides.
This slide shows the segment and nodal point numbering and layer numbering conventions for a single panel module. Each segment of the single-module model has 11 equally spaced nodal points. The root of the stringer web is attached at nodal point no. 6 in Segment no. 2.
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