Hierarchical High-Fidelity Analysis Methodology for Buckling Critical Structures
Publication: Journal of Aerospace Engineering
Volume 18, Issue 3
Abstract
A hierarchical high-fidelity analysis methodology for predicting the critical buckling load of compression-loaded thin-walled isotropic shells is described. This hierarchical procedure includes three levels of fidelity for the analysis. Level 1 assumes that the buckling load can be predicted by the classical shell solution with simply supported boundary condition, and with a linear membrane prebuckling solution. Level 2 includes the effects of a nonlinear prebuckling solution and the effects of traditional clamped or simply supported boundary conditions. Level 3 includes the nonlinear interaction between nearly simultaneous buckling modes and the effects of boundary imperfections and general boundary conditions. Various deterministic and probabilistic approaches are used to account for the degrading effects of unavoidable shell-wall geometric imperfections. The results from the three solution levels are compared with experimental results, and the effects of the assumptions and approximations used for the three solution levels are discussed. This hierarchical analysis approach can be used in the design process to converge rapidly to an accurate prediction of the expected buckling load of a thin-shell design problem.
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Acknowledgment
Part of the research reported in this paper has been carried out during the first writer’s tenure as an NRC Research Associate at the NASA Langley Research Center in 2002. This support is gratefully acknowledged.
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Published In
Journal of Aerospace Engineering
Volume 18 • Issue 3 • July 2005
Pages: 168 - 178
Copyright
© 2005 ASCE.
History
Received: Jun 27, 2003
Accepted: Feb 24, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
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