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    Free vibrations of antisymmetric angle-ply laminated thin square composite plates
    (Sampe Publishers, 2008) Aydogdu, Metin; Timarci, Taner
    Accurate numerical results are presented for vibration frequencies of anti-symmetric angle-ply laminated thin square composite plates having different boundary conditions. Boundary conditions are chosen as two adjacent free edges and the remaining edges either simply supported, clamped or free. The Ritz method, along with the displacement assumed in the form of simple polynomials, is applied to solve the problems. Convergence studies are presented to demonstrate the accuracy of the results. The effects of various parameters such as fiber orientation, number of layers and boundary conditions upon the natural frequencies are studied.
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    STACKING SEQUENCE OPTIMIZATION OF COMPOSITE BEAMS WITH DIFFERENT LAYER THICKNESSES
    (Lublin Univ Technology, Poland, 2015) Karacam, Fatih; Timarci, Taner
    In this study, stacking sequence optimization of composite beams with different layer thicknesses is investigated for various boundary conditions. A unified shear deformation theory is used for analytical solution. The optimization process is carried out in order to obtain the minimum deflection parameters for Clamped-Free (C-F), Clamped-Clamped (C-C) and simply supported (S-S) boundary conditions under a uniform distributed load by use of genetic algorithm for a specific number of population and generation. Finally, among all possible combinations of layer thicknesses, the one giving the minimum deflection parameter and corresponding stacking sequence is chosen. The minimum values and corresponding stacking sequences are presented for different boundary conditions.
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    Static analysis of thin-walled laminated composite closed-section beams with variable stiffness
    (Elsevier Sci Ltd, 2017) Gunay, M. Gokhan; Timarci, Taner
    Static behavior of thin-walled laminated composite closed cross-section beams having variable stiffness is investigated in this study. The analytical model used accounts for flexural-torsional coupling and warping effects as well as the variable stiffness along the contour of the cross-section of the beam. The variable stiffness is acquired by constructing the laminates with curvilinear fibres having certain specific paths. The orientation of fibres varies by depending on the fibre path along the contour of the cross-section in each layer. Equilibrium equations are derived by use of minimum potential energy principle. Although the formulation given can be applied to any shape of the closed cross-section with straight or curved edges, preliminary numerical results are presented only for box-beams. A displacement based finite element method is developed to solve the analytical model and to predict displacements and rotations under the effect of different types of loading conditions. Numerical results are obtained for different fibre paths and lay-up configurations and compared with the available solutions in the literature also with the results of a finite element analysis software using shell element. (C) 2017 Elsevier Ltd. All rights reserved.
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    Stresses in thin-walled composite laminated box-beams with curvilinear fibers: Antisymmetric and symmetric fiber paths
    (Elsevier Sci Ltd, 2019) Gunay, M. Gokhan; Timarci, Taner
    Stress analysis of thin-walled composite laminated box beams having variable stiffness is realized in this study based on an analytical model accounting for flexural-torsional coupling and warping effects. The variable stiffness of the beam is acquired by constructing laminates with curvilinear fibers having certain specific paths. The fiber paths of variable stiffness layers are classified in three groups as antisymmetric, symmetric and asymmetric. A displacement based finite element method is used to solve the analytical model and to calculate the distributions of axial and transverse shear stresses at different locations of the cantilever composite beam subjected to the transverse and the torsional loading at its free end. Numerical results obtained are compared with available results in the literature for specific cases. A detailed investigation is performed to understand the relation between the stress distributions along the cross section of the beam and the shape of curvilinear fibers for antisymmetric and symmetric cases.