9 articles in this issue
Bogdan Kopey,Volodymyr Artym,Iryna Rachkevych,Ruslan Rachkevych
The object of research is the operation of drill pipes in a complex stress state. One of the most problematic places in this case is the process of fatigue, that is, the gradual accumulation of damage to the material of drill pipe under the influence of t... see more
Ruslan Rachkevych,Vasyl Ivasiv,Vasyl Bui,Lidi?a Yurych,Iryna Rachkevych
The object of research is the operation of the drill string in the local bend of the well. One of the most problematic aspects in this case is the establishment of its stress-strain state. This is very important information, which, in particular, is used ... see more
Oleg Kuzin,Bohdan Lukiyanets,Nikolay Kuzin
The object of research is the behavior of grain boundaries, the conditions for the formation of intergranular damage and intercrystalline destruction of polycrystalline alloys under the influence of force loads. The problem of creating internal boundary z... see more
Olena Chulieieva
The object of research is the electrophysical properties of fireproof composite materials of ethylene with vinyl acetate, which include filler-flame retardants and modifiers. One of the biggest problems is the change in the electrophysical properties of f... see more
Mykola Ostroverkhov,Danylo Trinchuk
The nonlinear electric circuit with an independent controllable electromechanical energy converter is the object of this research. Such circuit nowadays has large practical use in many vehicles. The developers of these vehicles conduct frequent research a... see more
Anatolii Dudnikov,Vladimir Dudnik,Oleksander Kanivets,Oleksandra Bilovod,Oleksii Burlaka
The object of research is the technological process of improving the reliability of the recovery of ploughshare disks of grain seeders by vibration hardening. One of the most problematic places is the lack of knowledge of this process in the restoration o... see more
Sardar Qasimov,Rashad Mammadov,Sevinj Karimova
The object of research is the numerical simulation of the filtration process of oil, gas and water on adaptive grids taking into account some properties of liquids during their joint flow. To obtain an adequate description of the processes, it is necessar... see more
Valerii Kryvonosov
The object of research is the methods of non-destructive monitoring of the state of a bolted current-carrying joint under conditions of dynamically changing current load conditions and ambient temperature. One of the most problematic places in the modern ... see more