Liubov Dobrovolskaya

• Professor at Lutsk National Technical University

Predetermined by the need to increase effectiveness of electric power supply and electric power consumption, the interconnected problems of effectiveness of these processes were explored. The object of present study is effectiveness of operation of electric power systems and the subject of the study is the processes to increase their effectiveness....

We proposed a computational model for the determination of the kinetics of propagation of hydrogen cracks in a body caused by high pressures in these cracks formed due to ultrahigh hydrogen concentrations in the body. The model is based on the deformation criterion of fracture mechanics with regard for the hydrogen concentration, the mechanism of j...

We formulate a mathematical model for the determination of the effect of hydrogen on the period of initiation of creep-fatigue macrocrack in the vicinity of a stress concentrator in a plate. By using this model, we find the period of initiation of a macrocrack for a strip with two side notches under cyclic loads, high temperatures, and the action o...

We propose a numerical model for the evaluation of the influence of hydrogen on the subcritical growth of high-temperature creep cracks in metallic materials. The model is based on the first law of thermodynamics specifying the energy balance and the rates of changes in the energy components in a metallic body weakened by a macrocrack and subjected...

The procedure for energy approach-based estimation of the subcritical growth period for a high-temperature creep crack in a two-layer plate is proposed. The validity of the procedure is illustrated by the example of central crack extension in the plate.