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This is Fig. a1 from the 2009 GENOPT paper. This slide shows a STAGS 360-degree model of the equivalent ellipsoidal shell with a spherical cap (shell unit 1) and 11 toroidal segments (shell units 2 – 12). Each of the twelve axisymmetric STAGS shell units is shown in a different color.
This model is analogous to the BIGBOSOR4 model displayed 9 slides ago. The elongated shape of the 410 finite elements nearest the pole causes early lack of convergence in nonlinear cases that involve elastic-plastic mat’l. STAGS results in Figs. 6 – 168 of the 2009 GENOPT paper are based on this 360-degree model.
Another STAGS model, the so-called "soccarball" model, is shown three slides hence. The STAGS "soccerball" model does not experience any lack of convergence.
STAGS is often used to evaluate optimum designs previously obtained by GENOPT/BIGBOSOR4.
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