Buckling of stiffened curved panel with sub-stiffeners under combined loads. This is an intermediate-sized sub-domain model of a 360-deg. cyl. shell

This is Fig. 3 from the 2005 PANDA2 paper.

This slide shows the STAGS model for inter-ring and local buckling: 3 major ring bays x 9 major stringer bays; all major stiffeners and sub-stiffeners are modeled with shell units; the STAGS 480 finite element is used. This is bifurcation buckling mode 1 for the optimized perfect shell; predicted buckling load factor from STAGS = Pcr = 0.97738. The PANDA2 model predicts buckling at the load factor, Pcr = 1.0 (the design load factor).

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