Buckling of a sub-domain model in which all stiffeners and sub-stiffeners are modeled as flexible shell units

This is Fig. 17 from the 2005 PANDA2 paper. Shown here is a STAGS 3 x 9 major-bay sub-domain model of the shell previously optimized as imperfect by PANDA2 (Case name = testax4). The shell is perfect in this STAGS linear buckling model.

Here we have a STAGS prediction of stringer rolling buckling in the STAGS sub-domain model of a stiffened and sub-stiffened cylindrical shell under combined axial compression, external pressure, and in-plane shear.

All stiffeners and sub-stiffeners are modeled as shell units, fasteners are used, and the STAGS 480 finite element is used.

This is bifurcation buckling mode 2, buckling load factor, Pcr = 1.2557.

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