KSHP. OMD №4-2025

A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)

Towards theoretical calculations for strength under complex stress conditions

The article is devoted to the theoretical issues of calculating the strength of brittle materials under various patterns of sample loading. A statistical criterion for the equivalence of inhomogeneous stress states is obtained. The article also presents differences in the results of strength calculations obtained by classical statistical methods.
Keywords: strength; tension; statistical theory of strength; integral probability distribution law.

A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)

Determination of heat transfer in a rod for the case of a change in the coefficient of external heat transfer using the Airy function

The article is devoted to the theoretical issues of heat transfer through a rod. The paper considers the case of a change in the coefficient of external heat transfer, which may be associated with a change in the coefficient of thermal conductivity of the coating layer or with a change in the thickness of the coating. In this case, the process under consideration is stationary. The solution to the problem is given using the method of variable substitution and the application of the Airy function.
Keywords: rod; heat transfer; external heat transfer coefficient; Laplace method; differential equation; Airy function.

A. M. Burov, D. V. Bagrov, V. V. Pikhurov, P. S. Malyuk (Volgograd State University of Architecture and Civil Engineering, Volgograd)

Analysis of design and force parameters of the device for radial casing drawing abstract

A diagram of a hydromechanical device for radial drawing of a metal plaster in a well during workover work has been developed. The analysis of the layout of the forming elements of the device is carried out. An assessment of the force parameters of the plaster drawing in the casing is given.
Keywords: well; casing; metal plaster; radial drawing; hydromechanical device; deformation force.

V. M. Davydov, D. D. Yakuba (Pacific National University, Khabarovsk); S. N. Himukhin, K. P. Eremina (Institute of Materials Science KhSC FEB RAS, Khabarovsk)

Ultrasonic treatment of electrospark depositions

Using a specially designed stand, it is carried out smoothing of depositions on samples of 40X steel (cathode) by the ultrasonic plastic deformation method. The coatings are formed using Cu (anode) by means of electrospark alloying. The stand, built on the basis of a lathe and an UPD unit, allows discretely changing the static force N = 0,5; 1; 1,5; 2; 2,5; 5 kgf, the speed and the number of passes of the UPD unit indenter during surface smoothing. The prospect of using discontinuities formed on the smoothed coating as oil pockets for friction surfaces is shown. Using the example of forming a smoothed deposition surface for a friction bearing, it is shown that in order to achieve the specified surface parameters, a processing mode is required that includes two passes with different N (5; 2,5 kgf). A comparative analysis of Abbott curves for predicting the parameters of the supporting surface and wear resistance is presented. The obtained research results allow using the stand and research methods to establish the smoothing modes of electrospark depositions formed by various anodes and cathodes.
Keywords: electrospark alloying; ultrasonic treatment; roughness; Abbott curves; surface parameters; microrelief.

A. V. Petrov (MSUT «STANKIN», Moscow)

Investigation of the effect of processing parameters on the coefficient of safety margin of the cutting element in prefabricated step drills with NSR

This article examines the influence of processing parameters (cutting speed, feed and cutting depth) on the safety margin coefficient of a prefabricated step drill with a NSR. The SolidWoks Simulation software package is used, which allows numerical modeling and determination of the stress-strain state. This study is conducted by applying different cutting forces to the cutting plate of the drill, followed by determining the safety margin coefficient obtained both numerically and as a result of the program. The safety margin coefficient is determined according to various criteria, namely, the Pisarenko-Lebedev criterion, the Mohr-Coulomb criterion and the criterion of maximum normal stress. The effect of the processing parameters is carried out by evaluating each of the parameters individually. Graphs of changes in the safety margin coefficient are constructed depending on various processing parameters. The conducted research and the obtained results make it possible to optimize the tool design process, and can also be used in the development of recommendations on the choice of cutting modes.
Keywords: safety margin coefficient; prefabricated step drill; cutting plates; cutting modes; computer simulation.

A. P. Gaevoy, E. M. Martynov (Stary Oskol Technological Institute named after. A. A. Ugarova (branch) NUST MISIS, Stary Oskol); D. N. Romanenko (Gubkin branch of NUST MISIS, Gubkin)

Mathematical modeling of the study of the processes of strengthening of screw surfaces using PPD

A brief description of the studies of the thread profile before the IOR is presented. A geometric model of pulsed thread running-in with a roller in the DEFORM-3D software package is shown, and it is found that the following factors have the greatest effect on stresses and deformations in the IOR of large threads: the overlap coefficient of the prints, the duration, amplitude, and energy of the deforming pulse. The obtained dependences will make it possible to select the IOR modes that provide the required degree and depth of hardening.
Keywords: heterogeneous hardening; surface plastic deformation; PPD; cutting and deforming treatment; trapezoidal carving; combined method; roller rolling; rational shape of a pre-cut groove.

Xiaoshu Xu (BMSTU, Moscow)

Investigation of nonlinear dynamic response and mechanisms of shell instability in aerospace engineering

The functioning of aerospace technology, from satellites to powerful launch vehicles, directly depends on the ability to withstand extreme operating conditions. Sudden temperature fluctuations, overloads, airless space and aggressive substances pose challenges for designers. The reliability of such facilities is largely due to competent engineering solutions, and protective shells are a fundamental element of this reliability, and therefore understanding the characteristics, properties, and tasks performed by these shells is part of the design and creation process of aerospace technology. The article is devoted to the study of nonlinear dynamic response and instability mechanisms of thin-walled shells, widely used in aerospace engineering. The article examines the main sources of nonlinearity, including geometric nonlinearity, material nonlinearity, and interaction with the external environment. The author also analyzed various phenomena resulting from nonlinear behavior, such as resonance, bifurcations, and chaotic oscillations, as well as the mechanisms of shell loss of stability.
Keywords: shells; nonlinear dynamic response; instability; aerospace engineering; geometric nonlinearity; material nonlinearity; finite element method.

A. A. Dorokhov (NUST MISIS, Moscow)

Consideration of modern trends and promising research directions in the field of obtaining zirconium oxide from the gas phase

This article is devoted to the analysis of current trends and promising research areas in the field of zirconium oxide synthesis from the gas phase. Modern methods for obtaining this material, their advantages and disadvantages, as well as opportunities for further improvement of technological processes are considered. Particular attention is paid to the study of new approaches to the synthesis of zirconium oxide, including the use of innovative catalysts and the development of environmentally friendly technologies. In addition, potential applications of the obtained zirconium oxide in various industries, such as electronics, medicine, and energy, are discussed. Data from scientific literature sources concerning the methods of obtaining zirconium oxide fiber are provided. Zirconium oxide fiber has good prospects for use as high-temperature thermal insulation due to the highest refractoriness among oxide ceramics, high strength and chemical resistance, especially alkali resistance.
Keywords: zirconium oxide production; gas phase; plasma technologies; laser technologies; catalysts; precursors; ion implantation; plasma spraying; composites; increasing purity; decreasing temperature; increasing yield; improving properties; analytical tools; quality control.

Yu. S. Abramenko, V. A. Akushevich, E. A. Kursevich (RFNC-VNIITF, Snezhinsk)

Labor intensity as an indicator of manufacturability in the manufacture of products using additive technology

This article discusses methods for assessing the labor intensity of products manufactured using additive technology (AT). Research conducted on this topic by different authors, as applied to additive manufacturing, is considered. Calculations and assessment of the labor intensity of a set of parts manufactured using two different methods - mechanical processing and the AT method are carried out.
Keywords: manufacturability of product design; labor intensity; manufacturability coefficient; additive technologies.

Yu. N. Loginov, D. O. Sobolev (UrFU; IPM Ural Branch of RAS, Ekaterinburg)

Assessment of mechanical properties when stretching by tensile stripes of aluminum alloys

It is noted that in the production of sheets and plates from aluminum alloys, two main types of straightening are used: alternating bending and stretching. The alternating bending scheme is used for straightening relatively thin semi-finished products; accordingly, stretch straightening is used for thick sheets and slabs of limited length. Using the monitoring system of an industrial stretching machine with a nominal force of 70,000 kN, the possibility of determining the elastic and plastic characteristics of an aluminum alloy is assessed. Testing has shown that using the monitoring system of a stretching straightening machine, it is possible to determine the value of the conditional yield strength of the aluminum strip material, but the elastic deformation characteristics are determined with a large error. Measuring the properties of an industrial product on a straightening-stretching machine allows you to automatically average the obtained values entirely within the volume of the semi-finished product.
Keywords: plastic deformation; tensile straightening; Young's modulus; tensile diagram.