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This is Fig. 62 in the 2006 difficult paper. This slide shows a STAGS "compound" model of the PANDA2-optimized shell. In the STAGS compound model the mesh density varies over the circumference. The STAGS index, ILIN = 1.
This is bifurcation buckling mode No. 28, the first mode of the perfect shell that corresponds to general buckling. The buckling load factor, Pcr = 1.4429. This mode is used as an initial imperfection shape in a following nonlinear equlibrium analysis by STAGS.
The optimum design is listed in Table 14 (4 slides ago).
In the STAGS compound model the stringers are smeared out over 300 degrees of circumference and modeled with shell units over the 60-degree sector where the mesh is dense in the circumferential coordinate direction. The rings are modeled as shell units everywhere.
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