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This is Fig. 18 from the 2007 axialcomp paper. This slide shows the same buckling mode from STAGS as that displayed in the previous slide, viewed end-on. One can see that there are 12 half-waves around the circumference, that is, 6 full circumferential waves. This general buckling mode shape agrees with that predicted by PANDA2.
The fact that there are 12 full circumferential waves around the complete (360-degree) cylindrical shell means that a 60-degree STAGS model such as that shown in Fig. 7 of the paper can be used in STAGS models.
(From: AIAA 48th Structures, Structural Dynamics, and Materials Conference, Paper no. AIAA-2007-2216, 2007)
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