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![Buckling load factor (eigenvalue), lambda, from the simple closed form PANDA-type model retained as one of the many buckling models included in PANDA2](thumbnails/s76.jpg) |
![The](thumbnails/s77.jpg) |
![(Nx,Nxy) load-interaction curves for a four-layered angle-ply laminated curved plate](thumbnails/s78.jpg) |
![A stringer-stiffened panel with three identical modules](thumbnails/s79.jpg) |
![Single skin-stringer module of a multi-module stiffened panel](thumbnails/s80.jpg) |
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Buckling load factor (eigenvalue), lambda, from the simple closed form PANDA-type model retained as one of the many buckling models included in PANDA2 |
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The "alternative" double-trigonometric-series-expansion buckling model introduced into PANDA2 in 1999 |
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(Nx,Nxy) load-interaction curves for a four-layered angle-ply laminated curved plate |
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A stringer-stiffened panel with three identical modules |
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Single skin-stringer module of a multi-module stiffened panel |
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![Single skin-stiffener module showing the layer numbering and nodal point numbering conventions used in PANDA2](thumbnails/s81.jpg) |
![Laminated composite skin-T-stringer module](thumbnails/s82.jpg) |
![A single discretized skin-T-stiffener module](thumbnails/s83.jpg) |
![Local postbuckling of a blade stiffened panel](thumbnails/s84.jpg) |
![Another view of the locally post-buckled blade-stiffened panel module shown in the previous slide](thumbnails/s85.jpg) |
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Single skin-stiffener module showing the layer numbering and nodal point numbering conventions used in PANDA2 |
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Laminated composite skin-T-stringer module |
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A single discretized skin-T-stiffener module |
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Local postbuckling of a blade stiffened panel |
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Another view of the locally post-buckled blade-stiffened panel module shown in the previous slide |
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![Buckling under combined axial compression and in-plane shear of an optimized Z-stiffened cylindrical shell with internal rings and external stringers](thumbnails/s86.jpg) |
![Buckling under combined axial compression and in-plane shear of an optimized T-stiffened cylindrical shell with internal rings and external stringers](thumbnails/s87.jpg) |
![Nonlinear collapse of the imperfect T-stiffened shell shown in the previous slide](thumbnails/s88.jpg) |
![Collapse of a blade stiffened cylindrical shell under combined loads, Nx and Nxy](thumbnails/s89.jpg) |
![Buckling of stiffened curved panel with sub-stiffeners under combined loads. This is a small sub-domain model of a complete cylindrical shell.](thumbnails/s90.jpg) |
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Buckling under combined axial compression and in-plane shear of an optimized Z-stiffened cylindrical shell with internal rings and external stringers |
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Buckling under combined axial compression and in-plane shear of an optimized T-stiffened cylindrical shell with internal rings and external stringers |
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Nonlinear collapse of the imperfect T-stiffened shell shown in the previous slide |
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Collapse of a blade stiffened cylindrical shell under combined loads, Nx and Nxy |
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Buckling of stiffened curved panel with sub-stiffeners under combined loads. This is a small sub-domain model of a complete cylindrical shell. |
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