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Zelenyak V.M.,ivska Politekhnika National University
Materials Science

We study a two-dimensional problem of thermoelasticity for a plane containing a two-component circular inclusion and a crack. The problem is reduced to a system of two singular integral equations on closed (boundary of the inclusion) and nonclosed (crack) contours. The numerical solution of these integral equations is obtained by the method of mechanical quadratures. We also study the effect of thermal and mechanical properties of the components of the inclusion on the stress intensity factors at the crack tips. © 2012 Springer Science+Business Media New York. Source

Hvozdyuk M.M.,Ukrainian Academy of Sciences | Babyak I.P.,ShulGin State Road Research Institute | Hembara T.V.,ivska Politekhnika National University | Kostiv R.B.,Ukrainian Academy of Sciences
Materials Science

We determine the characteristics of static and fatigue strength of basalt reinforcement with nominal diameters of 4, 6, 8,10, and 12 mm in the cases of static and cyclic tension of the specimens. In particular, we establish the fatigue limit σ N for a basic number of cycles N equal to 2·106 cycles. © 2014 Springer Science+Business Media New York. Source

Musii R.S.,ivska Politekhnika National University
Materials Science

A dynamic centrally symmetric problem of thermomechanics is posed for a hollow conducting sphere subjected to a uniform nonstationary electromagnetic action. By using the cubic approximations of the azimuthal component of the magnetic-field strength and the radial component of the stress tensor in the radial coordinate, we obtain the solution of the problem and perform the numerical analysis of the thermal stressed state and the load-carrying capacity of nonferromagnetic spheres under the electromagnetic action in the mode with pulsed modulating signal. © 2011 Springer Science+Business Media, Inc. Source

Tor-Swiatek A.,Lublin University of Technology | Suberlyak O.,ivska Politekhnika National University | Krasins'Kyi B.,ivska Politekhnika National University | Dulebova L.,Technical University of Kosice
Materials Science

We study some strength characteristics and the structure of porous polypropylene extrudates obtained by the twin-screw extrusion. We use a ZSK-18 MEGAlab laboratory twin-screw extruder (Coperion Werner & Pfleiderer GmbH) with the ratio of length to the diameter of the screws L/D = 24 and the Expancel 950MB80 and 950MB120 innovative foaming agents. The dependences of the strength characteristics of the porous extrudate on the extrusion rate and the contents of foaming agents are analyzed. © 2014 Springer Science+Business Media New York. Source

Hachkevych O.R.,NASU Pidstryhach Institute for Applied Problems in Mechanics and Mathematics | Musii R.S.,ivska Politekhnika National University
Materials Science

A procedure is proposed for the prediction of the bearing ability of conducting structural elements under the action of electromagnetic pulses. For bodies of canonical shapes, i.e., plates and hollow and solid cylinders or spheres, the initial-boundary-value problems are formulated for the evaluation of the parameters of electromagnetic fields, temperature, and the components of the tensor of dynamic stresses. We construct the dependences of the maximum values of stress intensities in these nonferromagnetic bodies on the time parameters of electromagnetic pulses and the maximum magnetic-field intensity on the surfaces of the bodies. These dependences are then used to determine the critical values of the analyzed quantities corresponding to the loss of the bearing ability of the body. © 2011 Springer Science+Business Media, Inc. Source

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