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OPTIMUM DESIGN OF ANTI-BUCKLING BEHAVIOUR OF THE LAMINATED COMPOSITES BY DIFFERENTIAL EVOLUTION AND SIMULATED ANNEALING ALGORITHMS

Akçair, Mehmet

Yüksek Lisans | 2017 | İzmir Katip Çelebi Üniversitesi Fen Bilimleri Enstitüsü

Laminate composites can be used quite naturally in automotive, marine, aviation and other engineering branches. Determination of buckling load capacity under in-plane composite loads of composite plates is very important for the design of composite structures. In this thesis, Differential Evolution (DE) and Simulated Annealing (SA) are utilized for optimal stacking sequence of a laminated composite plate, which is simply supported on four edges and is subjected to biaxial in-plane compressive loads. The optimization problem parameters are defined as (i) Objective function: critical buckling load factor, (ii) Constraints: sym . . .metric and balanced structure, thin plate assumption, specially orthotropic material, discrete search space, (iii) Design variables: fiber orientation angles of lamina. The laminated composite plate under consideration is 64- ply laminate made of graphite/epoxy. The fiber angles are integers varying between -90 and 90 ( 90 90 ) with different degree increments in the laminate sequence. In cases where the angle variation are continuous and discrete, the optimization results are compared. In addition, the optimization methods used in similar optimization studies in the literature and the results obtained under the thesis (based on DE and SA) are also compared. The critical buckling loads are maximized for the factors of load case and plate aspect ratio, and are compared with published results. Moreover, critical buckling load factor has been investigated for the materials Boron/Epoxy, Graphite/Epoxy, Carbon/Epoxy, Kevlar/Epoxy, S2 Glass/Epoxy, Fiberite/HyE9082A, S-Glass/Epoxy, E-Glass/Epoxy, Flax/Epoxy, E-Glass/Polyster, Alfa/Polyester and Flax/Polypropylene. As a result, it has been found that the parameters load, load ratio and plate aspect ratio are effective for optimization of the critical buckling load factor that increases buckling resistance of laminated composites. It is also observed that the DE method shows better computational performance than SA Daha fazlası Daha az

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