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DEVELOPING MODELS, METHODS, EXPERIMENTAL FACILITIES, AND STUDYING THE NONLINEAR PROCESSES OF DEFORMATION, STABILITY AND FAILURE OF COMPLEX MECHANICAL ENGINEERING STRUCTURES SUBJECT TO NON-STATIONARY DYNAMIC EFFECTS AND INTERACTING WITH THE SURROUNDING MEDIA
Main results:
Leading experts:
Main technological and research equipment:
Main partners and customers:
Key projects (sources of financing):
Main publications:
Main results:
- Mathematical models of nonlinear dynamic problems of elasto-plastic shells, numerical methods for the design and weight optimization of composite structures have been developed;
- Nonlinear processes of buckling, limiting states and supercritical behavior of elasto-plastic shells under static and dynamic loading have been theoretically and experimentally studied;
- An experimental-computational method for identifying the deformation and strength properties of materials and structural elements has been developed for large deformations and non-uniform stressed-strained state;
- Finite-element methods for modeling geometrically and physically nonlinear dynamic problems of complex compound structures in contact interaction with liquid and soil media have been developed;
- The developed mathematical models, numerical methods, algorithms and programs have been used in developing and refining the design of airspace engineering facilities, nuclear charges, atomic and thermonuclear facilities, main pipelines of nuclear power plants (Busher, Rostov, etc.), large-size explosion containment cubicles, shock-resistant shipping containers for radioactive materials and other advanced equipment.
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Leading expert:
- Valentin Georgievich Bazhenov, Doctor of Sciences (Physics and Mathematics), Professor, Honoured Worker of Science of the Russian Federation.
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Main technological and research equipment:
- The software complexes Dinamika-2 ( for analyzing the problems of dynamic contact interaction between continua and structures in two-dimensional formulation) and Dinamika-3 (for analyzing three-dimensional problems of non-stationary deformation of structures including massive bodies and shells), certified by Gosstandart of the Russian Federation;
- The experimental complex for studying the behavior of structural materials under intense dynamic loading.
The complex is designed for studying the behavior and determining the physical and mechanical properties of a wide range of materials of varying physical nature (metals and their alloys, polymers and composites, soils and concretes, ceramics, wood, etc.) under impact loading.
The complex, makes it possible to perform dynamic tests and to determine:
- Dynamic diagrams of deformation in tension, compression and shear at the strain rates of 102 ÷ 104s-1 and the temperatures up to 400°C;
- Shock compressibility and spall strength of materials at 5 GPa;
- Dynamic crack resistance of materials;
- Resistance of armoured vests to shock effects of bullets and splinters;
- Dynamic properties of low-density and granular materials;
- All the main mechanical properties of materials: deformation diagra ms, yield point and ultimate tensile strength, limiting characteristics of plasticity s and y , energy capacity, dynamic crack resistance, shear resistance of low-density and loose media;
- To study the effect of the strain-rate history on the mechanical properties of materials under cyclic dynamic loading of the same or different signs.
The experimental stands consist of one-stage and two-stage gas guns equipped with the devices implementing Kolsky method, and the stands for studying the problems of impact interaction of compact bodies with various media in the direct and inverse formulations.
The gas guns have the calibers of 10; 20; 57mm and make it possible, in laboratory conditions, to achieve the impact velocities in the range of 10 to 2000 m/s.
The experimental facilities are equipped with modern computers and electronic equipment enabling the automation of experimental information acquisition and processing (VISAR system for registering the intensive elasto-plastic shock waves and spallation failure, TDS2004 and TDS2014 digital registering systems for fast processes, and others).
The facilities for analyzing the problems of shock interaction include two gas guns, with the caliber of 20 and 57 mm. To register the penetration and piercing processes, both the direct and inverse experiments are used. In the direct experiment, the process of shock interaction is registered using the IMACON-468 high-speed camera. The use of the high-speed shadow photography makes it possible to visualize the process of impact and enables the analysis of the integrated picture of penetration and piercing. To analyze the integrated loading, the inverse experiment in combination with the measuring rod technique is used. Using the above technique makes it possible to establish the dependence of the forces of resistance to penetration on the shape, angle, and physical and mechanical properties of the striker and the target.
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Main partners:
- RFNC-VNIIEF,
- OKBM Afrikantov.
Main customers:
- RFNC-VNIIEF,
- RFNC-VNIITF,
- OKBM Afrikantov,
- Atomenergoproject.
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Key projects (sources of financing):
- Projects of the International Scientific and Technical Center (ISTC): Development of engineering design of the increased capacity shipping cask for spent nuclear fuel with depleted uranium biological shield, Project No. 1413-963-00 (2003-2004); Development of the engineering design of the mobile explosion containment system withstanding a specified number of pulse loading cycles, Project No. 2683. (2004-2006);
- Grants of the President of the Russian Federation for supporting leading scientific schools of the Russian Federation (1997-2009);
- Grants of the Russian Basic Research Foundation 99-01-00132, 01-01-00556, 02-01-00594, 04-01-00454, 04-05-64614, 05-01-08055 ofi, 05-01-00837, 05-08-50212, 05-08-33618, 07-01-00257, 07-08-1363 ofi, 08-01-00500, 08-08-00560, 08-08-00883, 08-08-97060 r-p-a, 08-08-970048 r-p-a, 07-08-13637, 08-08-05065-b, 08-08-01838-e_b;
- Projects under the Federal Target Program “Integration” (1997-2004);
- Projects under the program “Scientific research in higher education institutions in priority areas of science and technology (2001-2004);
- Projects in the inter-branch program of the Education Ministry and Ministry of Atomic Energy in the field of "Cooperation in science and innovation" (2000-2004);
- Project RI-112/001/404 «Theoretical and experimental research into the dynamics, strength and expected service life of atomic power plants at the design and operation stages» has been carried out within the frame of the Federal target scientific and technical program «R&D in priority areas of development of science and engineering» (2002-2006);
- Project 2007-6-1.6-08.01.054 «Development of scientific principles for assessing the technical condition and extending the service life of ground-, sea- and space-based nuclear power plants on the basis of modern methods for analyzing strength and reliability» has been carried out within the frame of the Federal target scientific and technical program «R&D in priority areas of development of Russia’s science and technology complex in 2007-2012 »;
- Project 2.1.2/881 "Development of methods and information means for assessing expended life and forecasting residual life of nuclear power plants on the basis of mathematical models and parameters of working processes" in the Analytical departmental target program «Development of scientific potential of higher education (2009-2010)»;
- Contractual research commissioned by the following organizations: OKBM Afrikantov, RFNC-VNIIEF, RFNC-VNIITF, Atomenergoproject.
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Main publications:
- Bazhenov V.G., Zefirov S.V., Kramarev L.N., Pavlyonkova E.V. Modeling the processes of deformation and the localization of plastic strains in solids of revolution under torsion-tension // Prikladnaya matematika i mekhanika. Volume 72. Issue 2., 2008. Pp. 342-350.
- V.G.Bazhenov, V.K.Lomunov, D. Ò . Chekmarev. Numerically modeling the nonlinear dynamic problems of elasto-plastic structures // Matematicheskoe modelirovanie. – 2006. - V.18, No.1. - Pp. 10-16.
- N. À . Abrosimov, V.G.Bazhenov Nonlinear dynamic problems of composite structures. // NNSU Publishing House. N.Novgorod. - 2002. – 400 p.
- V.G.Bazhenov Mathematical modeling and methods of identification of deformation and strength properties of materials. Fizicheskaya mesomekhanika. V. 10. No.5. 2007. Pp. 91-105.
- Bazhenov V.G., Kotov V.L. A method for identifying elasto-plastic properties of soils by impact penetration // Izvestiya Akademii Nauk. Mekhanika Tverdogo Tela, 2008, No. 4, pp. 184–190.
- Bazhenov V.G., Zefirov S.V., Osetrov S.L. A method for identifying the deformation and strength properties of metals and alloys. Deformatsiya i razrushenie materialov. 2007. No.3. Pp. 43-48.
- Bazhenov V.G., Zefirov S.V., Osetrov S.L. The experimental-computational method for constructing true deformation diagrams for high deformations based on hardness tests. // Doklady Akademii Nauk. 2006, V.407, No.2, pp.118-121.
- Bazhenov V.G., Zefirov S.V., Osetrov S.L. The experimental-computational method for identifying the deformation and strength properties of materials. // Zavodskaya laboratoriya. Diagnostika materialov. 2006. No.9. V.72 . Pp.39-45.
- Abrosimov N.A., Bazhenov V.G., Kulikova N.A. Identification of visco-elastic characteristics of composite materials based on the results of experimental and theoretical analysis of the dynamic behavior of hemispherical shells. PMTF. 47, No.3, 2006 Pp.126-133.
- Bazhenov V.G., Kotov V.L. Analyzing the problems of oblique penetration of axially symmetric strikers into soft soils based on the flat cross-section hypothesis // Doklady Akademii Nauk. Mekhanika. 2008. V. 434. No.4. Pp. 470-473.
- Bazhenov V.G., Bragov A.M., Krylov S.V., Kotov V.L., Tsvetkova E.V. The analysis of nonlinear effects of the penetration of a cylindrical striker into a sandy soil. Problemy prochnosti. No.5. 2003, Pp. 104-112.
- Bazhenov V.G., Zhukov V.V., Zamyatin V.A., Kibets A.I., Krylov S.V. Numerically modeling the development of the process of a beyond-design-basis accident inside the pressure vessel of a fast neutron reactor // Problemy mashinostroeniya i nadezhnosti mashin. 2006. No. 4. Pp.116-121.
- Bazhenov V.G., Gordienko A.V., Zefirov S.V., Kibets A.I., Krushka L. Modeling the deformation and failure of structures made of piecewise-homogeneous materials with a regular structure under explosive loading // Matematicheskoe modelirovanie. V.18. No. 8. 2006. Pp. 86-92.
- Bazhenov V.G., Kibets A.I., Kibets Yu.I., Laptev P.V., Ryabov À . À , Romanov V.I., Sotskov V.I. Finite-element analysis of a high-speed impact of a shipping cask against an obstacle // Problemy mashinostroeniya i nadezhnosti mashin. - 2004 – No. 2 - Pp.118-125.
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