EFFECT OF STRUCTURE OF TITANIUM ALLOYS ON THE RELATIONSHIP CHARACTERISTICS OF THEIR DUCTILITY, TOUGHNESS AND MECHANICAL STABILITY

SHYIAN Artur V., Cand. Phys.-Math. Sc., Senior Researcher of the Department of Physics of Strength and Fracture, Kurdyumov Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

MESHKOV Yuriy Ya., Corresponding Member of the NAS of Ukraine, Dr. Techn. Sc., Chief Researcher of the Department of Physics of Strength and Fracture, Kurdyumov Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

SAVVAKIN Dmitriy G., Dr. Phys.-Math. Sc., Leading Researcher of the Department of Physics of Strength and Plasticity Inhomogeneous Alloys, Kurdyumov Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Formulated the idea of the two types of behavior of mechanical properties of structural titanium alloys in the relationship -plasticity-strength-mechanical stability-. It is shown that the same values of strength &#963 0,2 and mechanical stability Kms species belonging alloys is caused by their level of plasticity: the first type includes alloy increased, and the second-with a reduced level &#968 K. It is found that the species of the titanium alloys produced using powder metallurgy technology, the main influence the grain size and pore volume content, thus increasing the grain size and increase of porosity lead to a sharp decrease in the plastic properties of the alloy, which may cause changes in the behavior of their species mechanical characteristics. Specific accessory has a decisive influence on the degree of inclination of the alloy to its embrittlement under the influence of factors such as low temperature and stress concentrators (cracks, cuts, etc.).

mechanical stability, generalized diagram, kind of behavior of mechanical characteristics, species

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DEFORMATION HEATING CYLINDRICAL SAMPLES TYPE LUDWIK-SCHEU TENSILE

MOYSEYCHIK Aleksandr E., Graduate Student, Belarusian National Technical University, Minsk, Republic of Belarus, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

VASILEVICH Yuriy V., Dr. Phys.-Math. Sc., Professor, Head of the Department “Resistance of Materials of Mechanical Engineering Profile”, Belarusian National Technical University, Minsk, Republic of Belarus, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

MOYSEYCHIK Evgeniy A., Cand. Techn. Sc., Associate Professor, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A number of laws of deformation and failure of cylindrical samples such as Ludwik-Scheu are established. It is shown that the samples of smooth deformation heating raises the temperature of the surface to the (40-100) °C. In areas with recesses surge in temperature is much lower due to the smaller volume of a deformable metal. Increase of speed from (0,8-1,6) mm/s up (33,3-98,9) mm/s results in temperature rise of a surfase in 2,5-3 times (80-90) °C.

deformation, samples with recesses, plastic deformation temperature

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STUDY OF DEFORMATION OF FLEXIBLE LONG SHALLOW NONCIRCULAR CYLINDRICAL PANELS WITH CLAMPED LONGITUDINAL EDGES BY REFINED THEORY

MARCHUK Mykhailo V., Dr. Phys.-Math. Sc., Professor, Head of the Department of Mechanics of Thin-Walled Structure Elements, Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of the National Academy of Sciences, L`vov, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

TUCHAPSKYY Roman I., Cand. Phys.-Math. Sc., Junior Researcher of the Department of Mechanics of Thin-Walled Structure Elements, Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of the National Academy of Sciences of Ukraine, L`vov, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

PAKOSH Vira S., Cand. Phys.-Math. Sc.,Senior Researcher of the Department of Mechanics of Thin-Walled Structure Elements, Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of the National Academy of Sciences of Ukraine, L`vov, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

The basic equations and relations of geometrically nonlinear Tymoshenko type theory of transversely isotropic flexible long shallow noncircular cylindrical shells were considered and the solvable equation for the deflection of the shell was built on their basis. An exact analytical solution for the stress-strain state of a long non-circular cylindrical panel with clamped longitudinal edges under a uniformly distributed transverse load was obtained for the case of non-tensile normal forces in the middle surface. The calculation results by means of this solution were compared with the results of the exact analytical solution based on the Donnell-Mushtari-Vlasov theory. Deformation of long non-circular cylindrical panels was investigated in the supercritical region.

flexible long shallow noncircular cylindrical panel, Tymoshenko type theory of shells

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CARRYING CAPACITY OF REINFORCED THREE LAYERS CIRCULAR COMPOSITE PLATE CLAMPED ON EDGE AND LYING ON NON-COMPRESSIBLE FOUNDATION

JAHANGIROV Akif A., Cand. Techn. Sc., Associate Professor, Azerbaijan Technical University, Baku, Azerbaijan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

The problem considered in the title is solved in the paper. The algebraic equations for the moment field, for limit load and for the unknown radius of plastic domains are obtained. There used the plastic yield condition which is found by using the limit forces of all components of composite and the characterized geometrical parameters. The statically allowable fields of bending moments are determined.

load-carrying capacity, fiber-reinforced tree layer composite, rigid inset, non-compressible foundation, annular plate, clamped contour

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