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Information × Registration Number 0226U003006, (0120U105681) , R & D reports Title Analysis of the stress-strain state, vibrations and stability of compound shells of rotation, noncircular cylindrical shells with different cross sections and polygonal plates based on numerical and experimental approaches. popup.stage_title Проведення аналізу областей стійкості спряжених оболонок обертання при комбінованих навантаженнях, полів напружень та переміщень, динамічних характеристик для некругових циліндричних оболонок з різним поперечним перерізом та зрізами і багатокутних пластин змінної товщини; виявлення основних закономірностей щодо впливу геометричних, фізико-технічних параметрів оболонок та граничних умов на розподіл відповідних механічних характеристик; порівняння деяких числових результатів з експериментальними та підготовка рекомендацій з дослідження стаціонарного деформування оболонкових елементів конструкцій. Head Hryhorenko Oleksandr Ya., Доктор фізико-математичних наукHryhorenko Yaroslav M., Доктор технічних наук Registration Date 12-03-2026 Organization S.P. Tymoshenka Institute of Mechanics of the National Academy of Sciences of Ukraine popup.description1 Carrying out a study of stress-strain state, vibrations and stability of shells and plates of complex shape based on the developed numerical and experimental approaches. popup.description2 The dependence of the critical values ​​of the external pressure of a corrugated cylinder, as a shell of alternating curvature, on the depth of the corrugations and the density of their location along the length was investigated. The ranges of changes in these corrugation parameters that are most favorable for the stability of the shell were identified. The finite element method was used to determine the frequencies and shapes of free vibrations of thin corrugated open cylindrical shells with different methods of longitudinal cutting in half and with different variations of boundary conditions. The dependence of the frequency of free vibrations on the variant of longitudinal cutting in half was established. The main regularities regarding the influence of mechanical parameters of the material on the distribution of the corresponding characteristics of the stress-strain state of shells of different geometries were identified on the basis of the numerical analysis of the stress-strain state of non-thin elliptical cylindrical shells made of continuous-inhomogeneous material. The propagation of axisymmetric waves in a hollow homogeneous piezoceramic cylinder with different electrical boundary conditions on the side surfaces was investigated based on the linear theory of elasticity and linear electromechanical coupling. The influence of electrical boundary conditions and the direction of polarization of piezoceramics on the spectral characteristics of the propagation of electroelastic waves in a hollow homogeneous piezoceramic cylinder was analyzed. Using the finite element method, the stress-strain state of spatial bodies bounded by cylindrical surfaces with guides in the form of confocal ellipses was analyzed. At the same time, an elliptical coordinate system was used to derive the solution equations. The displacement in the cylinder was compared for different values ​​of the semi-axes of the ellipses in the cross section. Product Description popup.authors Makhnenko Oleh V. Lesia V. Kharytonova Maksym Y. Borysenko Kriukov Mykola M. Olena I. Belan Hanna V. Mamychenko Liliia S. Rozhok Nataliia P. Boreiko popup.nrat_date 2026-03-12 Close