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Registration Number

0216U007051, 0113U004017 , R & D reports

Title

Development of methodology for assessing and extending the life of inhomogeneous constructions of rocket and space engineering taking into account the stress concentrators

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Head

Hudramovych Vadym Sergiyovych,

Registration Date

23-03-2016

Organization

The Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine

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The research subjects are non-homogenous structural members for rocket and space technology objects with cuts. The research objectives are to develop the methodology of numerical studies of stressed-strained states and to assess the life of non-homogenous structural members for rocket and space technology The research methods: ones of mechanics of deformable rigid body, structural mechanics, computational mathematics, analytical and numerical methods, comparative analysis. The results: designs of current objects of rocket and space technology with stress concentrators are analyzed. Problems of assessments of the strength, the supporting power and life are formulated;general numerical methods for calculating the strength and the supporting power of plate-shell structures of rocket-space technology with stress concentrators in the form of cuts are developed using new projection and iteration versions of the finite element method with provision for plastic deformation of materials to assess the life of objects of rocket-space technology; numerical methods for solving the specific problems of assessment of the strength and life of structures of rocket-space technology are developed considering interactions between cuts; stressed-strained states of sections of launch vehicles with one rectangular cut in plastic deforming a material is found; stressed-strained states of sections of launch vehicles with two and more rectangular cuts ( similar and various ones) with provision for their interactions associated with plastic deformation of materials are analyzed numerically; a numerical analysis of stressed-strained states of launch vehicle sections with triangular stiffened members at angles and those that enclose angles in rectangular cuts is carried out and the effects of stiffened members on lowering stresses and strains in zones of cuts are assessed; the supporting power of launch vehicle sections is analyzed considering the effects of initiation and transformation of zones of plastic deformations in loading; stressed-strained states and the supporting power of launch vehicle sections are computed. Results of a numerical analysis of stressed-strained states are compared with computations based on SE “KB “Yuzhnoye” techniques. A good coincidence is obtained under significant savings in the computing time. Results on using the techniques, based on FEM and developed during this project, have been implemented in processing advanced launch vehicles (Antares, Zenit, Cyclone-3) at SE “KB”Yuzhnoye.” Methodology of Assessment and Extension of Service Life of Non-Homogenous Structures of Rocket-Space Technology Considering Stress Concentrators

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Гудрамович Вадим Сергійович
Репринцев Олексій Васильович
Рябоконь Сергій Андрійович
Самарська Олена Вікторівна

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2020-04-02