Example 11, Slide 28: Buckling of a complexly corrugated cylindrical shell under uniform axial compression (compression normal to the screen)

This is part of Fig. A20 from the 2014 GENOPT paper.
A buckling mode and load factor from a HUGEBOSOR4 model of the optimized specific case called “fold913updwn” with “smoothing” present. There are 920 shell segments in this HUGE model. The complex corrugated cross-section profile was first optimized with the use of a much, much smaller BIGBOSOR4 model that includes only WIDTH/2 = 50 inches.

HUGEBOSOR4 is a modified form of BIGBOSOR4. Whereas BIGBOSOR4 will handle up to 295 shell segments, HUGEBOSOR4 will handle up to 2950 shell segments. This increased capacity is especially helpful in computing load factors and mode shapes for the general buckling of truss-core sandwich cylindrical shells, such as that shown in the next slide. It is expected that HUGEBOSOR4 will be used mainly in connection with GENOPT.

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