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This and the next seven images are from:
“Minimum weight design of an axially compressed isotropic prismatic panel consisting of a series of cylindrical segments and verification by STAGS”, by David Bushnell and Michael S. Jacoby, AIAA Paper 2014-0844, 55th AIAA Structures, Structural Dynamics and Materials Meeting, part of SCITECH2014, National Harbor, Maryland, January 13-17, 2014. This paper is called "2014 GENOPT paper" in the next 7 slides.
This figure shows a buckling mode and load factor from a HUGEBOSOR4 model of an optimized complexly corrugated cylindrical shell 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. The entire cylindrical shell consists of 20 repeating sections of WIDTH = 100 inches.
Generation of a “HUGEBOSOR4” version of “BIGBOSOR4” (September, 2013):
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 and complexly corrugated cylindrical shells such as those shown here. It is expected that HUGEBOSOR4 will be used mainly in connection with GENOPT or in any other context in which valid input files for HUGEBOSOR4 are generated by a computer program or by a subroutine rather than “by hand”.
"HUGEBOSOR4" is activated when the user gives the command, "HUGEBOSOR4LOG". The consequently activated command set for "HUGEBOSOR4" is the same as that for "BIGBOSOR4", but the FORTRAN coding in HUGEBOSOR4 has been modified greatly to expand the capability to analyze multi-segment shells of revolution and multi-segment prismatic shells.
HUGEBOSOR4 was generated in connection with the production of the 2014 GENOPT paper. See Section 16 and Appendix 6 of that paper for more details. Also see the GENOPT page of this web site.
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