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This is Fig. 16 from the 2010 GENOPT paper. This slide shows the critical local skin buckling mode of the optimized cylindrical shell with weld lands spaced at 120-degree intervals.
This model of the axially compressed cylindrical shell includes a length of shell between adjacent rings, with the rings replaced by simple supports.
Symmetry conditions are applied at 0 degrees (bottom of the figure) and at 90 degrees (top of the figure), which implies weld lands spaced at 180 degrees, not 120 degrees. However, the behavior is not sensitive to the difference in spacing of the weld lands for less than four weld lands over 360 degrees.
The shell is analyzed as a true prismatic shell and not as a huge torus as shown six slides ago. This model is generated by the PANDA2 processor called PANEL3.
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