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Документ Vibration analysis of laminated functionally graded shallow shells with clamped cutout of the complex form by the Ritz method and the R-functions theory(Brazilian Association of Computational Mechanics, 2019) Kurpa, Lidiya; Shmatko, Tetyana; Awrejcewicz, JanThe R-functions theory and Ritz approach are applied for analysis of free vibrations of laminated functionally graded shallow shells with different types of curvatures and complex planforms. Shallow shells are considered as sandwich shells of different types: a) face sheets of the shallow shells are made of a functionally graded material (FGM) and their cores are made of an isotropic material; b) face sheets of the shallow shells are isotropic, but the core is made of FGM. It is assumed that FGM layers are made of a mixture of metal and ceramics and effective material properties of layers are varied accordingly to Voigt’s rule. Formulation of the problem is carried out using the first-order (Timoshenko’s type) refined theory of shallow shells. Different types of boundary conditions, including clamped, simply supported, free edge and their combinations, are studied. The proposed method and the created computer code have been examined on test problems for shallow shells with rectangular planforms. In order to demonstrate the possibility of the developed approach, novel results for laminated FGM shallow shells with cut of the complex form are presented. Effects of different material distributions, mechanical properties of the constituent materials, lamination scheme, boundary conditions and geometrical parameters on natural frequencies are shown and analyzed.Документ Analysis of Geometrically Nonlinear Vibrations of Functionally Graded Shallow Shells of a Complex Shape(Marcílio Alves, 2017) Awrejcewicz, Jan; Kurpa, Lidiya; Shmatko, T.Geometrically nonlinear vibrations of functionally graded shallow shells of complex planform are studied. The paper deals with a power-law distribution of the volume fraction of ceramics and metal through the thickness. The analysis is performed with the use of the R-functions theory and variational Ritz method. Moreover, the Bubnov-Galerkin and the Runge-Kutta methods are employed. A novel approach of discretization of the equation of motion with respect to time is proposed. According to the developed approach, the eigenfunctions of the linear vibration problem and some auxiliary functions are appropriately matched to fit unknown functions of the input nonlinear problem. Application of the R-functions theory on every step has allowed the extension of the proposed approach to study shallow shells with an arbitrary shape and different kinds of boundary conditions. Numerical realization of the proposed method is performed only for one-mode approximation with respect to time. Simultaneously, the developed method is validated by investigating test problems for shallow shells with rectangular and elliptical planforms, and then applied to new kinds of dynamic problems for shallow shells having complex planforms.Документ Geometrically Nonlinear Vibrations of Functionally Graded Shallow Shells(NTU "KhPI", 2016) Shmatko, T.; Bhaskar, A.An original method for investigation of geometrically nonlinear vibrations of functionally graded shallow shells and plates with complex planform is presented. Shells under consideration are made from a composite of ceramics and metal. Power law of volume fraction distribution of materials through thickness is chosen. Mathematical statement is implemented in the framework of the refined geometrically nonlinear theory of the shallow shells of the first order (Timoshenko type). The proposed approach combines the application of the Rfunctions theory (RFM), variational Ritz method, procedure by Bubnov-Galerkin and Runge-Kutta method. Due to use of this combined algorithm it is possible to reduce the initial nonlinear system of motion equations with partial derivatives to a nonlinear system of ordinary differential equations. Investigation task of functionally graded shallow shells with arbitrary planform and different types of boundary conditions is carried out by the proposed method. Test problems and numerical results have been presented for one-mode approximation in time. In future, the developed method may be extended to investigation of geometrically nonlinear forced vibrations of functionally graded shallow shells with complex planform.