Minimum-weight design of compressively loaded composite plates and stiffened panels for postbuckling strength by Genetic Algorithm

The minimum-weight design of compressively loaded composite plates and composite stiffened panels under constrained postbuckling strength is addressed herein. A nonlinear finite element code, COSAP (COmposite Structural Analysis Program) was applied to analyze the buckling and postbuckling behavior....

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Bibliographic Details
Published in:Composite structures 2005-07, Vol.69 (2), p.239-246
Main Authors: Kang, Ji-Ho, Kim, Chun-Gon
Format: Article
Language:English
Subjects:
Applied sciences
Buckling
Composite
Composites
Exact sciences and technology
Forms of application and semi-finished materials
Fundamental areas of phenomenology (including applications)
Genetic Algorithm
Optimal design
Physics
Polymer industry, paints, wood
Postbuckling
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Technology of polymers
Weight-minimization
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Summary:The minimum-weight design of compressively loaded composite plates and composite stiffened panels under constrained postbuckling strength is addressed herein. A nonlinear finite element code, COSAP (COmposite Structural Analysis Program) was applied to analyze the buckling and postbuckling behavior. As an optimization technique, a modified Genetic Algorithm was used to find the optimum points. The parallel computing scheme was implemented with MPI (Message Passing Interface) library and realized in a parallel-computing supercomputer and a pc cluster. The optimal design was performed with two chosen examples: a composite plate and a composite stiffened panel. The design variables were the number of plies and the ply angle in each ply. In case of the stiffened panels, the size and the location of the stiffeners were also considered as the design variables. The objective function was defined as the product of the nondimensional weight and the strength. The optimization results showed better performances than conventional designs.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2004.07.001