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This and the next several slides show some of the stiffener cross-section shapes that can be accommodated by PANDA2.
This is Fig. 22 from the 1987 PANDA2 paper. This slide shows a single skin-T-stringer module:
(a) Discretized model of a tee-stiffened module with
(b) a local bifurcation buckling mode.
Model (b) is used by PANDA2 to determine local post-buckling behavior and stiffener pop-off.
Discretization of the module cross section is the same as that used in the BOSOR4 code: The "meridian" (arc length along each segment of the skin-stringer cross section) is discretized, and variation of the buckling modal displacements normal to the plane of the screen is trigonometric with m axial half-waves (strip method). The critical local buckling mode is found by searching over a range of m established by PANDA2 automatically or specified by the PANDA2 user.
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