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This and the next image are from:
M.J. Weber, P. Middendorf (Airbus, TU Stuttgart),
“Semi-analytical global and panel buckling of composite grid-stiffened cylindrical shells”, 3rd International Conference on Buckling and Postbuckling Behaviour of Composite Laminated Shell Structures with DESICOS Workshop, www.desicos.eu, 25-27 March 2015, Braunschweig, Germany
ABSTRACT: Structural stability is one, or the most design driving criterion for aerospace structures. The accurate prediction of the various forms of buckling becomes especially important when seeking a minimum weight design. The grid-stiffened structures, with the isogrid and orthogrid being the most popular forms, provide a large design space to investigate, but also exhibit a complex behaviour in terms of structural stability. This paper focuses on buckling of the panel as a whole by presenting and comparing semi-analytical methods for global and panel buckling, where the latter takes the discrete nature of the stiffening structure into account. Results are presented for parameter studies of the composite cylindrical grid-stiffened shell including mechanical effects from panel curvature, stiffener eccentricity, and material orthotropy. The results show panel buckling to occur at significantly lower loads compared to global buckling, with a magnitude depending on the very specific geometry and kind of applied loads.
References listed at the end of the paper:
. R.R. Meyer, O.P. Harwood, M.B. Harmon and J.I. Orlando, Isogrid Design Handbook, NASA CR-124075, McDonnell Douglas Astronautics Corporation (1973).
. M.J. Weber and P. Middendorf, Semi-analytical skin buckling of curved orthotropic grid-stiffened shells, Composite Structures, Vol. 108 (2014), pp. 616-624.
. D.L. Block, M.F. Card and M.M. Mikulas, Buckling of Eccentrically Stiffened Orthotropic Cylinders, NASA Techn. Note, TN D-2960 (1965).
. M.P. Nemeth and M.M. Mikulas, Simple Formulas and Results for Buckling-Resistance and Stiffness Design of Compression-Loaded Laminated-Composite Cylinders, NASA Report TP-2009-215778 (2009).
. R.B. Lehoucq, D.C. Sorensen and C. Yang, ARPACK Users' Guide: Solution of Large Scale Eigenvalue Problems with Implicitly Restarted Arnoldi Methods, Society for Industrial and Applied Mathematics (1997).
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