Journal
COMPOSITE STRUCTURES
Volume 78, Issue 4, Pages 537-550Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2005.11.015
Keywords
composite material; optimum design; laminated construction; stacking sequence; lamination parameter; unsymmetrical laminates; response surface; cylindrical shells; buckling
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The fractal branch-and-bound method has been developed by the authors for stacking-sequence optimizations of symmetric and balanced composite laminates comprise of two in-plane and two out-of-plane lamination parameters. Cylindrical structures such as tanks or pipes, however, are usually made from balanced laminates. In the present study, therefore, we focus on the stacking-sequence optimizations of unsymmetrical composite laminates. In the unsymmetrical laminates, nine lamination parameters including three coupling-lamination parameters exist, and its feasible design region of fractal pattern is unrevealed. The paper clarifies the feasible region in which the in-plane, out-of-plane and coupling lamination parameters create fractal patterns of tetrahedrons or tetradecahedrons. Using the fractal patterns of lamination parameters, the improved fractal branch-and-bound method is proposed for unsymmetrical laminates including coupling lamination parameters. This new method is applied to stacking-sequence optimization problems of maximization of buckling load of cylindrical laminated shells. As a result, the method is successfully applied, and a practical optimal stacking sequence is obtained with low computational cost. (c) 2005 Elsevier Ltd. All rights reserved.
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