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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/2246

Title: Computationally efficient analysis and optimisation of stiffened thin-walled panels in shear
Authors: Viljoen, A
Visser, AG
Groenwold, A
Keywords: Stiffened thin-walled panels
Shear
Computationally efficient analysis
Optimum design
Buckling
Postbuckling behaviour
Iterative procedure
Grisham algorithm
Microgenetic algorithm
Issue Date: May-2005
Citation: Viljoen, A, Visser, AG, and Groenwold, A. 2005. Computationally efficient analysis and optimisation of stiffened thin-walled panels in shear. Journal of Aircraft, Vol. 42(3), pp. 743-747.
Abstract: The computationally efficient analysis and optimum design of the buckling of stiffened, thin-walled shear panels in aircraft structures is discussed. Namely, the postbuckling behaviour of these panels is assessed using the iterative procedure developed by Grisham. This procedure requires only linear finite element analyses, whereas convergence is typically achieved in as few as five iterations. An algorithm developed by (A. F. Grisham, “A Method for Including Post-Buckling of Plate Elements in the Internal Loads Analysis of Any Complex Structure Idealized Using Finite Element Analysis Methods,” AIAA Paper 78-515, April 1978) using connect format, is compared with empirical methods of analysis frequently used in aircraft structures and also with a refined, nonlinear quasi-static finite element analysis. It is shown that the procedure proposed by Grisham overcomes some of the conservatism inherent in conventional methods of analysis. In addition, the method is notably less expensive than a complete nonlinear finite element analysis, which makes it attractive for use during initial design iterations, even though global collapse of a structure cannot be predicted. As an illustration of the optimal design of buckled, stiffened thin-walled structures, the Grisham algorithm is combined with a microgenetic algorithm. Important reductions in weight are obtained within relatively few function evaluations.
URI: http://hdl.handle.net/10204/2246
ISSN: 0021-8669
Appears in Collections:Aeronautic systems
Metal and metal processes
General science, engineering & technology

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