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Information × Registration Number 0224U001658, (0119U103519) , R & D reports Title Investigation of the behavior of different structure composite materials (reinforced by short fibers and layered) and shell structures made of them at conditions of compressive loadings popup.stage_title Вплив наявності маломасштабних міжфазних тріщин біля кутових точок межі поділу середовищ кусково-однорідних композитів на напружено-деформований стан в цих тілах Head Nazarenko Volodymyr M., д.т.н. Registration Date 26-01-2024 Organization S.P. Tymoshenka Institute of Mechanics of the National Academy of Sciences of Ukraine popup.description1 The purpose of the work is: - development of a numerical-analytical technique for solving the problem of the fracture of composite materials at compression along interacting cracks in three-dimensional formulation; - study of critical stresses and shortenings in composites at compression along interacting cracks; - development of methods for studying the stress-strain state of a piecewise homogeneous body withsmall-scale cracks at the angular point of the interface; - development of a numerical-analytical technique for solving the problem of the destruction of composite materials at compression along interacting cracks; - development of new numerical models, development of methods for solving discrete problems, creation and implementation of appropriate software for solving plane and spase problems of determination of boundary effects and stability of composites; - research in the framework of the three-dimensional approach of the influence of structural heterogeneity and complex conditions of compressive loads on the buckling of composite materials, which are reinforced by layers and short fibers; - development of an algorithm for solving the problem of nonlinear deformation and stability of layered cylindrical shells, taking into account their sensitivity to imperfections; investigation of critical loads of layered cylindrical shells and prediction of the nature of their post-buckling behavior in order to choose rational schemes of reinforcement and placement of layers popup.description2 An approach to solving problems of fracture mechanics of composite materials with interphase cracks at the corner points of a piece-homogeneous body is proposed. This approach allows us to move from the initial problem to the problem of the theory of elasticity for a wedge-shaped body with an interphase crack at the top and a condition at infinity that takes into account the influence of the external field. The limit equilibrium of a piecewise homogeneous isotropic elastic body with small-scale interphase shear cracks at the corner point of the media separation boundary in the presence of an internal loaded semi-infinite crack was investigated within the framework of the mentioned approach. The exact solution of the internal and external problems is constructed by the Wiener-Gopf method in combination with the apparatus of the Mellin integral transformation. Based on this solution, a formula for the stress intensity factor at the end of the interfacial crack was obtained. In accordance with the fracture force criterion, an equation for determining the destructive load was derived, the balance of interphase cracks was investigated for stability, and the nature of the change in the destructive load was studied. Product Description popup.authors Bystrov Victor M. Bohdanov Viacheslav L. Boichuk Vitalina Yu. Velychko Larysa H. Dekret Volodymyr A. Dovzhyk Mykhailo V. Zhukova Nataliia B. Zagorodniuk Olena M. Zelenskii Valerii S. Kipnis Oleksandr L. Tsyruk Serhii A. Shykula Olena M. popup.nrat_date 2024-01-26 Close