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Ternopil', Ukraine

Ternopil Ivan Pului National Technical University is a university in Ternopil, Ukraine. Ternopil Ivan Pul'uj National Technical University - the leading higher technical educational institution in Western Ukraine, founded in 1960 Wikipedia.

Yasniy O.P.,Ternopil Ivan Puluj National Technical University | Lapusta Y.,CNRS Pascal Institute
Comptes Rendus - Mecanique

The article deals with the influence of the defect initial shape on the residual lifetime of a continuous casting machine roll made of 25Cr1MoV steel. Based on this approach, previously proposed by some authors, the growth of the surface fatigue crack was modeled in a roll under loading and temperature conditions that are close to operational ones, taking into account the statistical distribution of the C parameter of Paris' equation. Dependencies of the continuous casting machines roll fatigue lifetime on the initial defect shape and critical defect sizes are obtained. © 2016 Académie des sciences. Source

Maruschak P.,Ternopil Ivan Puluj National Technical University
Materiali in Tehnologije

We have studied continuous-casting machine rolls' surface thermal cracking images. On the fundamentals of fractals a thermal cracking procedure analysis was proposed. The achieved results show that the thermal cracks have a strong self-similarity, according to the fractal laws, and the values of the fractal dimensions range from 1.0 to 2.0. The relationship between the fractal dimensions and the distribution values of the cracks' lengths is established. A new method of diagnostics and certain ideas for the analysis of the thermal cracking of a continuous casting machine roll with fractals theory is proposed. Source

Lupenko A.M.,Ternopil Ivan Puluj National Technical University
Technical Electrodynamics

The voltage resonant inverter with parallel connection of arbitrary numbers of half bridge sections as electronic ballastoutput stage for high pressure sodium lamps is analyzed. The analytical expressions for n-sections inverter currents andpowers are obtained, the features of its power phase control are considered. Source

Ignatovich S.R.,National Aviation University | Menou A.,National Airports Authority of Morocco ONDA | Karuskevich M.V.,National Aviation University | Maruschak P.O.,Ternopil Ivan Puluj National Technical University
Theoretical and Applied Fracture Mechanics

It was shown by tests conducted at the National Aviation University (Kiev, Ukraine) that fatigue damage of metal structures may be estimated by sensors with the surface relief pattern to indicate the accumulated fatigue damage. The nature of the deformation relief has been investigated by the light, scan and transmission microscopy, as well as by a new nano-interferometer, developed at the National Aviation University. Fractal analysis of the surface patterns based on box-counting method has proved the efficiency of fractal geometry application for additional quantitative description of such surface structures. The evolution of deformation relief parameters on the sensors surface is determined by the process of the sensor and construction fatigue damage accumulation. © 2013 Elsevier Ltd. Source

Konovalenko I.,Ternopil Ivan Puluj National Technical University | Maruschak P.,Ternopil Ivan Puluj National Technical University
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 11th International Conference, TCSET'2012

In this paper method of computer identification are proposed to identifying different type of multiple cracks on deformed nanocoating surface. © 2012 Lviv Polytechnic Natl Univ. Source

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