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General buckling mode of cylindrical balloon with 40 truss-like modules over 90 degrees of circumference

This is Fig. 65 from the 2012 GENOPT paper, "Use of GENOPT and BIGBOSOR4 to obtain optimum designs of multi-walled inflatable spherical and cylindrical vacuum chambers", by David Bushnell and Charles Rankin, AIAA 53rd Structures, Structural Dynamics, and Materials Conference, 2012, AIAA Paper 2012-xxxx.

This slide shows general buckling of an optimized cylindrical balloon with 40 modules over 90 degrees of circumference and with truss-like webs.

For more about this BIGBOSOR4 application, see the "GENOPT" slide show. GENOPT optimizes complex shells of this type with BIGBOSOR4 as the structural analyzer.

In this application of BIGBOSOR4 to a double-walled cylindrical balloon the true prismatic model introduced into BIGBOSOR4 in 2010 is used.

Reference for the "true prismatic" shell model incorporated recently (2010) into BIGBOSOR4:

Bushnell, David, "Comparison of a "huge torus" model with a true prismatic model for: 1. an axially compressed simple monocoque cylindrical shell, 2. an axially compressed optimized truss-core sandwich cylindrical shell, and 3. an axially compressed optimized internally ring and stringer stiffened cylindrical shell with a T-stiffened weld land, Unpublished report for NASA Langley Research Center, February 12, 2010 and contained in the file, ...bigbosor4/case/prismatic/prismaticshell.pdf

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