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This is Fig. 36 from the 2006 PANDA2 paper. Shown here is a STAGS sub-domain model of a T-ring and T-stringer stiffened imperfect cylindrical shell that was previously optimized as imperfect by PANDA2. The shell is subjected to combined axial compression and external pressure.
The STAGS sub-domain model includes 60 degrees of the cylindrical shell; the stringers are smeared, the STAGS 480 finite element is used.
Shown here is nonlinear buckling of the imperfect shell, general buckling modal imperfection amplitude, Wimp = 1.0 inch. The general buckling modal imperfection shape is shown in the previous slide.
Shown here is the nonlinear bifurcation buckling mode 1. The buckling load factor PA from STAGS = 1.1244. (PA = 1.0 is the design load factor under which the panel was previously optimized by PANDA2.)
The buckling mode is inter-ring buckling.
This configuration is listed in Table 14 of the 2006 PANDA2 paper.
For viewing figures and tables referred to here but not shown here, please download the 2006 PANDA2 paper from this website.
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