This paper considers the deformation properties of the body of the lithium-ion power cell (LIPC) Panasonic NCR18650B (LiNi0.8Co0.15Al0.05O2) exposed to the action of static load at various techniques of fixing the cell. Determining the properties of LIPCs under appropriate conditions makes it possible to fill the gap in existing studies, which will further ensure the safety of their use. Based on the results of experimental studies, the LIPC rigidity and temperature indicators were determined in accordance with the applied load. The most dangerous variant, from the point of view of fire danger, of applying a static load on the cell has been established. It was experimentally established that, on average, the Panasonic NCR18650B LIPC housing can withstand a load of about 80 kg·s/cm2 (or 7.84 MPa) without further ignition. An increase in pressure force in the range exceeding 85–90 kg·s/cm2 leads to an irreversible chain thermochemical reaction, which, within 2–3 seconds, leads to LIPC ignition. Compressing the LIPC evenly along its lateral surface showed the occurrence of combustion at the load on the cell equal to 150 kg·s/cm2. The average temperature of the cell during combustion caused by the deformation of the housing is 350–450 °C, and the maximum value is registered in the range of 580–680 °C. The mathematical model built on the basis of the mathematical theory of thin shells adequately describes the stressed-strained state of the cylindrical body of cells under the action of a force concentrated and distributed load. The estimation model is satisfactorily verified by experimental results, making it possible to improve the strength and rigidity of LIPC housing by choosing the appropriate steel grade for its body, the geometric dimensions, and the structural technique of its fastening.

The results of computer modeling of the stress-strain state of a frag¬ment of a steam turbine blade made of corrosion-resistant 08Cr18Ni10Ti steel under conditions of high-tempera¬tu¬re and long-term static loading are presented. The analysis is carried out using the finite element method in the ANSYS software environment based on a three-dimensional model which reproduces the real geometry of the working part of the blade. The distributions of equivalent stresses and time-dependent creep strains are determined, and the influence of temperature and steam pressure on the creep intensity are analyzed. The maximum creep strains are localized in the root region of the blade, where elastic strain energy is concentrated. To improve the accuracy of prediction, the obtained results were additionally analyzed using regression-based machine learning methods, which made it possible to clarify the influence of the main parameters on creep intensity and to assess the long-term serviceability of turbomachinery components.

Finite element modeling of the stress-strain state of the linear section of the pipeline under non-stationary force load was carried out to determine its residual life. Calculations were made for a pipe made of X60 steel of an oil pipeline with an internal surface crack under turbulent oil flow and hydraulic shock. It was established that hydraulic shocks reduce the residual life of the pipe in almost 2 times compared to laminar oil flow. Therefore, they must be taken into account to guarantee the reliable operation of pipeline transport.

We consider scheme of power supplies of the water pump's electric drive of increase of water pressure of system of internal fire water supply from the backup source with batteries and autonomous voltage inverter, its mathematical model and simulation results of electromagnetic and of electromechanical processes in the engine during start-up and operation of the pump in absence of the main power on the network, that provides use internal fire water supply at extraordinary situations during the estimated time. This reserve system can also be used to support the continuity of processes. General mathematical model of electric drive formed with mathematical models of individual elements of the scheme represented of multipoles, and the processes in them describe a closed system of equations - differential, algebraic and logical. The estimated model of electric drive formed by the connection between the external branches of individual elements-multipoles, namely the power supply with the battery, inverter voltage (cathode and anode of valve group), transformers and induction motor. The way connection between the external branches of individual elements-multipoles mathematically described of matrices connections that draw up for each item on the principle: the number of rows equal number of independent units of the scheme and the number of columns equal to the number of external branches of element. Calculating implemented by language of FORTRAN. Common routines designed to perform mathematical operations on matrices; numerical integration of differential equations by the Runge-Kutta 2nd order; solution systems of algebraic equations by Gauss; definition moment of natural closing valves. The results of modeling the direct start induction motor from the network , the stator current; rotor's angular velocity and electromagnetic torque and moment loads was set. The calculation results confirmed those of experimental studies, almost identical curves of current and voltage induction motor from the network and independent source of battery at start-up and operation of the pump, the shape of the output voltage source and a pressure of pump during continuous operation of the electric pump.