Pub Date : 2023-05-19DOI: 10.20535/2521-1943.2023.7.1.274050
Denys Panevnik
In order to improve the mathematical model of the working process of the above-bit ejection system for the conditions of its asymmetric rotation in the well, a method of modeling the circulating injected flow using a hydrodynamic vortex function, the center of which is shifted relative to the axis of the mixing chamber of the jet pump, has been developed. In the process of modeling the rotating asymmetric movement of the injected flow, the concept of circulation of the vector of the translational velocity of the liquid along a closed circuit is used. With the help of the components of the complex potential of the hydrodynamic circulation function, a graphical interpretation of the equipotential lines and flow lines of the spatial vortex with one-sided and two-sided displacement of the coordinate center was obtained. Using analytical relations for the velocity potential and stream function, the components of the circulation velocity are determined and the analyticity of the function of the complex potential with a shifted vortex center is proven. The fulfillment of the Cauchy-Riemann conditions allowed us to present the resulting velocity of the circulating current with the coordinate center shifted along the vertical axis in the form of a partial derivative of the complex potential. In contrast to the complex potential for a symmetric vortex, the ratio for determining the circulation speed in case of misalignment of the working nozzle and the mixing chamber of the jet pump contains an additional component in the form of the displacement of the vortex center.In the process of analyzing the results of using the proposed mathematical model, it was established that the resulting speed of the circulation current and the relative displacement of the spatial vortex center are directly proportional. The conducted studies proved that the ratio of the velocities of the symmetric and asymmetric circulation flow is a function of the displacement of the center of the vortex flow coordinates and varies from 1 to zero. The magnitude of the relative speed of the circulation flow is inversely proportional to the displacement of the coordinate center and the distance to the mixing chamber of the jet pump. The developed mathematical model can be used to predict the influence of the rotation of the ejection system on its pressure characteristic in the case of radial relative displacement of the working nozzle and the mixing chamber of the jet pump.
{"title":"Simulation of asymmetrical rotational flow in the flow part of a well jet pump","authors":"Denys Panevnik","doi":"10.20535/2521-1943.2023.7.1.274050","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.274050","url":null,"abstract":"In order to improve the mathematical model of the working process of the above-bit ejection system for the conditions of its asymmetric rotation in the well, a method of modeling the circulating injected flow using a hydrodynamic vortex function, the center of which is shifted relative to the axis of the mixing chamber of the jet pump, has been developed. In the process of modeling the rotating asymmetric movement of the injected flow, the concept of circulation of the vector of the translational velocity of the liquid along a closed circuit is used. With the help of the components of the complex potential of the hydrodynamic circulation function, a graphical interpretation of the equipotential lines and flow lines of the spatial vortex with one-sided and two-sided displacement of the coordinate center was obtained. Using analytical relations for the velocity potential and stream function, the components of the circulation velocity are determined and the analyticity of the function of the complex potential with a shifted vortex center is proven. The fulfillment of the Cauchy-Riemann conditions allowed us to present the resulting velocity of the circulating current with the coordinate center shifted along the vertical axis in the form of a partial derivative of the complex potential. In contrast to the complex potential for a symmetric vortex, the ratio for determining the circulation speed in case of misalignment of the working nozzle and the mixing chamber of the jet pump contains an additional component in the form of the displacement of the vortex center.In the process of analyzing the results of using the proposed mathematical model, it was established that the resulting speed of the circulation current and the relative displacement of the spatial vortex center are directly proportional. The conducted studies proved that the ratio of the velocities of the symmetric and asymmetric circulation flow is a function of the displacement of the center of the vortex flow coordinates and varies from 1 to zero. The magnitude of the relative speed of the circulation flow is inversely proportional to the displacement of the coordinate center and the distance to the mixing chamber of the jet pump. The developed mathematical model can be used to predict the influence of the rotation of the ejection system on its pressure characteristic in the case of radial relative displacement of the working nozzle and the mixing chamber of the jet pump.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135675210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-17DOI: 10.20535/2521-1943.2023.7.1.271512
Ivan Belmas, Olena Bilous, Hanna Tansura, Angelina Shvachka
Issues. Structural cable monitoring systems are widely used to diagnose the condition of cable-stayed bridges. Known methods of non-destructive control of the stressed state cannot in some cases be fully used, or their use is difficult and economically impractical or inefficient. The aim of the study. A model is offered that allows you to ensure the reliability of the rope with many degrees of damage. Method. The most convenient method for monitoring the mechanical parameters of cable ropes is the electrical resistance method. The results. The results of the dependence of the stress and current distribution on the rope parameters are presented. The researched method will increase the reliability, safety and service life of cable-stayed bridges. Scientific novelty. Our work consists in studying the impact of breaking the cables that make up cable ropes. For this, a model was created that allows you to combine several parameters (specific resistance and electrical conductivity, length, number of cables). We considered the case for removing the signal from one end of the cable. Practical significance. It is established that when changing the length of the resistance application and the number of cables, a change in the graph for the undamaged and damaged cable is displayed. The number and row in which the burst occurred were analyzed. In this way, the system that monitors one cable notifies about destruction and makes it possible to prevent it.
{"title":"Ensuring the supply of current to one end of the cable with different wire rope parameters","authors":"Ivan Belmas, Olena Bilous, Hanna Tansura, Angelina Shvachka","doi":"10.20535/2521-1943.2023.7.1.271512","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.271512","url":null,"abstract":"Issues. Structural cable monitoring systems are widely used to diagnose the condition of cable-stayed bridges. Known methods of non-destructive control of the stressed state cannot in some cases be fully used, or their use is difficult and economically impractical or inefficient. The aim of the study. A model is offered that allows you to ensure the reliability of the rope with many degrees of damage. Method. The most convenient method for monitoring the mechanical parameters of cable ropes is the electrical resistance method. The results. The results of the dependence of the stress and current distribution on the rope parameters are presented. The researched method will increase the reliability, safety and service life of cable-stayed bridges. Scientific novelty. Our work consists in studying the impact of breaking the cables that make up cable ropes. For this, a model was created that allows you to combine several parameters (specific resistance and electrical conductivity, length, number of cables). We considered the case for removing the signal from one end of the cable. Practical significance. It is established that when changing the length of the resistance application and the number of cables, a change in the graph for the undamaged and damaged cable is displayed. The number and row in which the burst occurred were analyzed. In this way, the system that monitors one cable notifies about destruction and makes it possible to prevent it.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135960299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-10DOI: 10.20535/2521-1943.2023.7.1.278104
Kostyantyn Balushok
The technological preparation of production (TPV) is one of the key stages of the product life cycle (LPL) when designing and developing new aircraft engines. The TPV system foresees the use of the following instruments: CAD/CAM/CAE systems to ensure the implementation of the following operations: automated design, production and engineering calculations; Product Data Management systems (PDM) to ensure product data management; Enterprise resource planning (ERP) systems for the corporate resource planning. Note that the instruments above are combined into PLM-systems to provide information support for the TPV system. The paper reviews the experience of designing and implementing the integrated TPV system at Motor Sich JSC for the purpose of manufacturing new aircraft engines. The author presents a structural diagram of the implemented integrated system containing a complex of interdependent subsystems along with a description of the system of automated design of process documents, which provides for the on-line design of production processes. The paper gives a description of subsystem of automated preparation of programs for CNC machine tools, which is designed to calculate the trajectory of the cutting tool when machining geometrically complex parts of aircraft engines. The paper specifies the subsystem of automated design of technological equipment, which is in compliance with requirements for modern tool production. The author underlines that the system of automated design of production equipment saw the following design subsystems reaching the highest level of development: subsystems for designing cutting and gear machining tools; subsystems for designing machine tools; subsystems for designing the monitoring and metering instrument; subsystems for designing foundry and stamping equipment; subsystems for designing control of gear cutting tools as per electronic standards. It is noted that the automated subsystems of analyzing production processes allow for performing the following analyses: analyzing metal casting processes; analyzing stamping processes; analyzing cutting processes; analyzing gear-cutting processes. The author provides the following results of implementing the integrated system of technological preparation of production at Motor Sich JSC: i) The TPV period was increased by 1.2–1.5 times, and ii) The efficiency of design and construction works was raised by 3–3.5 times.
{"title":"Experience of designing and implementing integrated system of technological preparation of productionfor manufacturing new aircraft engines","authors":"Kostyantyn Balushok","doi":"10.20535/2521-1943.2023.7.1.278104","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.278104","url":null,"abstract":"The technological preparation of production (TPV) is one of the key stages of the product life cycle (LPL) when designing and developing new aircraft engines. The TPV system foresees the use of the following instruments: CAD/CAM/CAE systems to ensure the implementation of the following operations: automated design, production and engineering calculations; Product Data Management systems (PDM) to ensure product data management; Enterprise resource planning (ERP) systems for the corporate resource planning. Note that the instruments above are combined into PLM-systems to provide information support for the TPV system. The paper reviews the experience of designing and implementing the integrated TPV system at Motor Sich JSC for the purpose of manufacturing new aircraft engines. The author presents a structural diagram of the implemented integrated system containing a complex of interdependent subsystems along with a description of the system of automated design of process documents, which provides for the on-line design of production processes. The paper gives a description of subsystem of automated preparation of programs for CNC machine tools, which is designed to calculate the trajectory of the cutting tool when machining geometrically complex parts of aircraft engines. The paper specifies the subsystem of automated design of technological equipment, which is in compliance with requirements for modern tool production. The author underlines that the system of automated design of production equipment saw the following design subsystems reaching the highest level of development: subsystems for designing cutting and gear machining tools; subsystems for designing machine tools; subsystems for designing the monitoring and metering instrument; subsystems for designing foundry and stamping equipment; subsystems for designing control of gear cutting tools as per electronic standards. It is noted that the automated subsystems of analyzing production processes allow for performing the following analyses: analyzing metal casting processes; analyzing stamping processes; analyzing cutting processes; analyzing gear-cutting processes. The author provides the following results of implementing the integrated system of technological preparation of production at Motor Sich JSC: i) The TPV period was increased by 1.2–1.5 times, and ii) The efficiency of design and construction works was raised by 3–3.5 times.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135673530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-08DOI: 10.20535/2521-1943.2023.7.1.277617
Leonid Lobanov, Pavlo Ustymenko, Yuriy Sydorenko, Mykola Pashchyn
The development of industry stimulates the development of modern approaches to the optimization of welded structures. The use of pulsed electromagnetic fields, plasma currents, electrodynamic forces and their combined effects is a new trend in engineering practice to improve the mechanical characteristics of metal materials and welded joints (WJ). Treatment with a pulsed electromagnetic field (TwPEMF) is a promising direction for optimizing the stress-strain states (SSS) of welded structures made of non-ferromagnetic metal materials. Using the method of electronic speckle interferometry, the effect of TwPEMF on the SSS of specimens of circumferential WJ with a thickness of δ = 1.0 mm from aluminium AMg6 alloy was investigated. Based on the original procedure using an accelerometer, the kinetics of the action of the force P of the magnetic field pressure on the residual displacements f and SSS of the specimens during their TwPEMF were investigated. TwPEMF of WJ specimens was performed without and with the use of an additional shield made of AMg6 alloy δ = 5.0 mm. It was found that the use of a shield increases the amplitude values of force P by up to two times, which is caused by an increase in the active volume of the conductive medium. At the same time, TwPEMF without and with the use of a shield contributes to the reduction of f values by 2 and 4 times, respectively, and residual SSS by 50 and 80%. On the basis of mathematical modelling, the advantages of using electrodynamic treatment (EDT) of butt WJ δ = 3.0 mm of АMg61 (1561) alloy in the TIG welding process compared to EDT at room temperature (Tk) are substantiated. According to the results of the model verification, it was proved that EDT during TIG contributes to the formation of peak values of residual compressive stresses in the weld zone by 60% more than EDT during Tk. The use of a pulsed barrier discharge (PBD), which generates a low-temperature plasma on the surface of the metal being treated, contributes to the optimization of its structure. An increase in the hardness HV of structural 25KhGNMT steel as a result of its PBD treatment from 420 to 510 units was established, which is accompanied by the dispersion of the metal microstructure.
{"title":"Progressive technologies of electrophysical treatment for regulation of stress-strain states of elements of welded structures","authors":"Leonid Lobanov, Pavlo Ustymenko, Yuriy Sydorenko, Mykola Pashchyn","doi":"10.20535/2521-1943.2023.7.1.277617","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.277617","url":null,"abstract":"The development of industry stimulates the development of modern approaches to the optimization of welded structures. The use of pulsed electromagnetic fields, plasma currents, electrodynamic forces and their combined effects is a new trend in engineering practice to improve the mechanical characteristics of metal materials and welded joints (WJ). Treatment with a pulsed electromagnetic field (TwPEMF) is a promising direction for optimizing the stress-strain states (SSS) of welded structures made of non-ferromagnetic metal materials. Using the method of electronic speckle interferometry, the effect of TwPEMF on the SSS of specimens of circumferential WJ with a thickness of δ = 1.0 mm from aluminium AMg6 alloy was investigated. Based on the original procedure using an accelerometer, the kinetics of the action of the force P of the magnetic field pressure on the residual displacements f and SSS of the specimens during their TwPEMF were investigated. TwPEMF of WJ specimens was performed without and with the use of an additional shield made of AMg6 alloy δ = 5.0 mm. It was found that the use of a shield increases the amplitude values of force P by up to two times, which is caused by an increase in the active volume of the conductive medium. At the same time, TwPEMF without and with the use of a shield contributes to the reduction of f values by 2 and 4 times, respectively, and residual SSS by 50 and 80%. On the basis of mathematical modelling, the advantages of using electrodynamic treatment (EDT) of butt WJ δ = 3.0 mm of АMg61 (1561) alloy in the TIG welding process compared to EDT at room temperature (Tk) are substantiated. According to the results of the model verification, it was proved that EDT during TIG contributes to the formation of peak values of residual compressive stresses in the weld zone by 60% more than EDT during Tk. The use of a pulsed barrier discharge (PBD), which generates a low-temperature plasma on the surface of the metal being treated, contributes to the optimization of its structure. An increase in the hardness HV of structural 25KhGNMT steel as a result of its PBD treatment from 420 to 510 units was established, which is accompanied by the dispersion of the metal microstructure.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135916604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-08DOI: 10.20535/2521-1943.2023.7.1.270308
Vasyl Kovalev, Oleksandr Shibaev, Wei Chenyu
The proposed article presents the materials of experimental and mathematical studies of internal inertial flows of an incompressible liquid during its fluctuations in tanks. An analysis of modern problems related to the harmful effect of liquid resonant splashing on tank structures, as well as on the trajectory and nature of the object movement itself with the liquid, was carried out. The use of damping baffles and guide devices in similar closed flows allows to fundamentally change the structure of internal flows, reducing gradients of shock pressures in flows, as well as redistributing the main liquid inertial effects. Numerical modeling of such flows qualitatively confirms the results of experimental studies and allows us to build a rather complex three-dimensional development picture of fluctuations in fluid flows. In addition to the use of the damping baffles structures, it is proposed to make the plane of baffles perforated with different degrees of permeability due to the diameter of the holes and their number. The effect of hydraulic resistance occurs when flow energy is lost due to overcoming artificial obstacles in the form of holes of small diameter. Thus, the shock effects of the flow on the walls of the tank are predicted to have a smaller amplitude and duration. The use of the proposed dampers labyrinth structures allows to control the force effects of the liquid only by hydraulic means and thus reduce the number and dimensions of the internal guide devices.
{"title":"Numerical modeling of internal flows in tanks with baffles","authors":"Vasyl Kovalev, Oleksandr Shibaev, Wei Chenyu","doi":"10.20535/2521-1943.2023.7.1.270308","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.270308","url":null,"abstract":"The proposed article presents the materials of experimental and mathematical studies of internal inertial flows of an incompressible liquid during its fluctuations in tanks. An analysis of modern problems related to the harmful effect of liquid resonant splashing on tank structures, as well as on the trajectory and nature of the object movement itself with the liquid, was carried out. The use of damping baffles and guide devices in similar closed flows allows to fundamentally change the structure of internal flows, reducing gradients of shock pressures in flows, as well as redistributing the main liquid inertial effects. Numerical modeling of such flows qualitatively confirms the results of experimental studies and allows us to build a rather complex three-dimensional development picture of fluctuations in fluid flows. In addition to the use of the damping baffles structures, it is proposed to make the plane of baffles perforated with different degrees of permeability due to the diameter of the holes and their number. The effect of hydraulic resistance occurs when flow energy is lost due to overcoming artificial obstacles in the form of holes of small diameter. Thus, the shock effects of the flow on the walls of the tank are predicted to have a smaller amplitude and duration. The use of the proposed dampers labyrinth structures allows to control the force effects of the liquid only by hydraulic means and thus reduce the number and dimensions of the internal guide devices.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135916774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-02DOI: 10.20535/2521-1943.2023.7.1.277718
Nataliya Strelenko, Vladyslav Kovalenko, Roman Mastenko
The relevance of using slag crust separation methods, which are characterized by easy separation and are based on thermo-deformation processes in the sample, is shown in the development of new welding materials. The developed method of assessing slag separation based on the theoretical calculation of thermo-deformation processes in the base metal has passed the stages of experimental research The experimental approbation of the proposed methodology for assessing the separation of the slag coating from the surface of welded joints under experimental fluxes based on the TiO2-MnO-SiO2–MgO–CaO-FeO-Al2O3 slag system was carried out for different welding regimes. The evaluation criterion for the high-temperature separation of the slag coating takes into account: the ratio of the geometric parameters of the test sample, the amount of heat input during the surfacing process, and the factor of the presence of spinel-forming components at the slag-metal interface. The selected parameters for evaluating the separation of the slag crust in points, where the guaranteed separation of the slag coating is counted for the arbitrary separation of the slag during its destruction or the arbitrary separation of the slag by a monolithic layer. The practical value of the proposed method lies in the possibility of quantitative assessment of the probability of high-temperature separation of the slag coating for a wide range of fluxes for surfacing.
The results of the conducted experiments show the efficiency of the developed methodology for evaluating the high-temperature separation of the slag coating from the surface of the weld metal.
{"title":"Methodology for evaluation of slag crust separation during surfacing of low- and medium-carbon steels","authors":"Nataliya Strelenko, Vladyslav Kovalenko, Roman Mastenko","doi":"10.20535/2521-1943.2023.7.1.277718","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.277718","url":null,"abstract":"The relevance of using slag crust separation methods, which are characterized by easy separation and are based on thermo-deformation processes in the sample, is shown in the development of new welding materials. The developed method of assessing slag separation based on the theoretical calculation of thermo-deformation processes in the base metal has passed the stages of experimental research The experimental approbation of the proposed methodology for assessing the separation of the slag coating from the surface of welded joints under experimental fluxes based on the TiO2-MnO-SiO2–MgO–CaO-FeO-Al2O3 slag system was carried out for different welding regimes. The evaluation criterion for the high-temperature separation of the slag coating takes into account: the ratio of the geometric parameters of the test sample, the amount of heat input during the surfacing process, and the factor of the presence of spinel-forming components at the slag-metal interface. The selected parameters for evaluating the separation of the slag crust in points, where the guaranteed separation of the slag coating is counted for the arbitrary separation of the slag during its destruction or the arbitrary separation of the slag by a monolithic layer. The practical value of the proposed method lies in the possibility of quantitative assessment of the probability of high-temperature separation of the slag coating for a wide range of fluxes for surfacing.
 The results of the conducted experiments show the efficiency of the developed methodology for evaluating the high-temperature separation of the slag coating from the surface of the weld metal.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135270427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-25DOI: 10.20535/2521-1943.2023.7.1.264790
Volodymyr Kaliuzhnyi, Volodymyr Levchenko, Oleksandr Kaliuzhnyi, Stanislav Sytnyk
Mathematical models were created using the finite element method and research was carried out on options for hot, semi-hot and cold crimping in a container and matrix of a special profile of axisymmetric hollow blanks made of high-carbon steel with variable wall thickness along the height. A plastic model of metal is used. Before hot and semi-hot crimping, the part of the workpiece was heated at the height to be deformed. The shape and dimensions of the initial blank for crimping were determined by calculation, which ensured the required dimensions of the product. The use of a container and a matrix of a special profile with a deforming surface made with ring protrusions made it possible to obtain a product in one pass for the considered options for crimping due to the reduction of the influence of frictional forces during molding. The rate of deformation was determined to maintain the mode of hot and semi-hot deformation during crimping. The dependence of the axial force on the deforming tool on the movement of the punch and the distribution of specific forces on the contacting surfaces was established. The use of cold pressing leads to an increase in the accuracy of the shape and dimensions of the product, a decrease in energy consumption and metal consumption. The final stress-strained state of the metal, the shape and dimensions of the product are determined. Based on the distribution of deformation intensity, an evaluation of the working of the metal structure by semi-hot and cold plastic deformation was carried out, and the yield point of the metal after crimping was predicted. On the basis of the simulation data, a design of the general appearance of the die equipment for cold crimping was developed.
{"title":"Options of crimping in a container and matrices of a special profile of axysymmetric hollow billets made of C60 steel","authors":"Volodymyr Kaliuzhnyi, Volodymyr Levchenko, Oleksandr Kaliuzhnyi, Stanislav Sytnyk","doi":"10.20535/2521-1943.2023.7.1.264790","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.264790","url":null,"abstract":"Mathematical models were created using the finite element method and research was carried out on options for hot, semi-hot and cold crimping in a container and matrix of a special profile of axisymmetric hollow blanks made of high-carbon steel with variable wall thickness along the height. A plastic model of metal is used. Before hot and semi-hot crimping, the part of the workpiece was heated at the height to be deformed. The shape and dimensions of the initial blank for crimping were determined by calculation, which ensured the required dimensions of the product. The use of a container and a matrix of a special profile with a deforming surface made with ring protrusions made it possible to obtain a product in one pass for the considered options for crimping due to the reduction of the influence of frictional forces during molding. The rate of deformation was determined to maintain the mode of hot and semi-hot deformation during crimping. The dependence of the axial force on the deforming tool on the movement of the punch and the distribution of specific forces on the contacting surfaces was established. The use of cold pressing leads to an increase in the accuracy of the shape and dimensions of the product, a decrease in energy consumption and metal consumption. The final stress-strained state of the metal, the shape and dimensions of the product are determined. Based on the distribution of deformation intensity, an evaluation of the working of the metal structure by semi-hot and cold plastic deformation was carried out, and the yield point of the metal after crimping was predicted. On the basis of the simulation data, a design of the general appearance of the die equipment for cold crimping was developed.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135223038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.20535/2521-1943.2023.7.1.277544
Petro Loboda, Volodymyr Zvorykin, Constantine Zvorykin, Eduard Vrzhyzhevskyi, Tatjana Taranova, Valery Kostin, Leonid Zvorykin
Natural metal composite materials represent a promising class of modern structural materials that need to be welded. Such materials can be welded by fusion, as has been established with the Ti-TiB alloy as an example. The enhanced operational properties of such materials are determined by the microstructure, which is characterized by the presence of microfibers of borides, carbides, or silicides in the metal matrix. To preserve the mechanical properties of materials in a welded joint, it is necessary to ensure the formation of reinforcing microfibers in the welded seam material. Determination of formation mechanism of boride microfibers, originated in the welded seam material, will become the basis for optimizing of fusion welding modes, in particular, electron beam welding mode.
The purpose of this study is the determination of formation mechanism of boride microfibers originated in the welded seam material. Two most probable variants of the formation mechanism are analyzed, which involve eutectic decomposition during crystallization from a liquid melt or eutectoid decomposition from a metastable crystallized alloy. The third version is a mixed variant of the two above-mentioned mechanisms.
In the article the results of metallographic analysis of features of boride phase distribution and an analysis of elemental composition of boride fibers based on local Auger electron spectroscopy are presented. The object of study was a Ti-TiB alloy joint obtained by electron-beam welding. The analysis factors were the features of size, orientation, and nature of the distribution of boride phase microfibers in different areas of the welded seam. The characteristic elemental composition of boride microfibers, which characterizes the correspondence to equilibrium phases, is also studied.
The degree of deviation of the ratio of boron and titanium in such a phase from the thermodynamically equilibrium in different layers of the material of the welded seam, formed by an electron beam in vacuum, is determined. The dependence of boride phase distribution under various conditions of heat exchange in the welded seam material on the side surfaces and in the central regions is established. It is shown that some of boride microfibers formed in the material of the welded seam are characterized by a deviation from the thermodynamically stable composition ТіВn (n = 1) to ТіВn (n = 0.85). The dendritic nature of boride microfibers distribution and the presence of meta-stable phase formations on Ti and B basis provide the grounds for proposing the predominant mechanism for the formation of structure of the welded seam material in the Ti-TiB alloy during crystallization.
An analysis of hypothetical variants of the formation mechanism of boride microfibers originated in the welded seam material showed that the formation of a dendritic type of structure is characteristic for the growth of crystals of a new phase in the liquid phase. Such growth is charact
{"title":"Features of the welded seam material crystalliza-tion in Ti-TiB alloy under electron-beam welding conditions","authors":"Petro Loboda, Volodymyr Zvorykin, Constantine Zvorykin, Eduard Vrzhyzhevskyi, Tatjana Taranova, Valery Kostin, Leonid Zvorykin","doi":"10.20535/2521-1943.2023.7.1.277544","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.277544","url":null,"abstract":"Natural metal composite materials represent a promising class of modern structural materials that need to be welded. Such materials can be welded by fusion, as has been established with the Ti-TiB alloy as an example. The enhanced operational properties of such materials are determined by the microstructure, which is characterized by the presence of microfibers of borides, carbides, or silicides in the metal matrix. To preserve the mechanical properties of materials in a welded joint, it is necessary to ensure the formation of reinforcing microfibers in the welded seam material. Determination of formation mechanism of boride microfibers, originated in the welded seam material, will become the basis for optimizing of fusion welding modes, in particular, electron beam welding mode.
 The purpose of this study is the determination of formation mechanism of boride microfibers originated in the welded seam material. Two most probable variants of the formation mechanism are analyzed, which involve eutectic decomposition during crystallization from a liquid melt or eutectoid decomposition from a metastable crystallized alloy. The third version is a mixed variant of the two above-mentioned mechanisms.
 In the article the results of metallographic analysis of features of boride phase distribution and an analysis of elemental composition of boride fibers based on local Auger electron spectroscopy are presented. The object of study was a Ti-TiB alloy joint obtained by electron-beam welding. The analysis factors were the features of size, orientation, and nature of the distribution of boride phase microfibers in different areas of the welded seam. The characteristic elemental composition of boride microfibers, which characterizes the correspondence to equilibrium phases, is also studied.
 The degree of deviation of the ratio of boron and titanium in such a phase from the thermodynamically equilibrium in different layers of the material of the welded seam, formed by an electron beam in vacuum, is determined. The dependence of boride phase distribution under various conditions of heat exchange in the welded seam material on the side surfaces and in the central regions is established. It is shown that some of boride microfibers formed in the material of the welded seam are characterized by a deviation from the thermodynamically stable composition ТіВn (n = 1) to ТіВn (n = 0.85). The dendritic nature of boride microfibers distribution and the presence of meta-stable phase formations on Ti and B basis provide the grounds for proposing the predominant mechanism for the formation of structure of the welded seam material in the Ti-TiB alloy during crystallization.
 An analysis of hypothetical variants of the formation mechanism of boride microfibers originated in the welded seam material showed that the formation of a dendritic type of structure is characteristic for the growth of crystals of a new phase in the liquid phase. Such growth is charact","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135568759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.20535/2521-1943.2023.7.1.266626
Sergiy Strutynskyi, Roman Semenchuk
Background Modern ground robotic complexes have a significant speed, which leads to the occurrence of vibrations of the platform and the manipulator. The problem is to develop highly efficient vehicles that take into account dynamic processes, and their impact is minimized by constructive solutions and dampers. Objective The purpose of the work is to study the dynamics of the moving platform of the robotic complex and establish its dynamic parameters. At the same time, it is necessary to determine the characteristics of oscillatory processes, in particular, linear and cross-angular movements of the platform. Methods A dynamic model of the platform has been developed. It has three degrees of freedom and takes into account the working processes of caterpillars and rollers. The calculation scheme has six points of support on the surface. The method is based on finding the position of the rollers determined by the profile of the road surface. The elastic-dissipative properties of the track and the surface are taken into account in the model. A research of the platform during its movement on a surface with a complex profile was carried out. Polyharmonic dependencies with random parameters are used to describe it. Results The developed model determine the dynamic characteristics of the robotic platform during its interaction with irregularities of arbitrary shape. Based on the found equations of spherical motion, mathematical modeling of work processes was carried out, angular coordinates and angular speeds of platform rotation were determined. Conclusions The results of modeling the spherical movement of the platform correspond to the physical essence of work processes. These data are necessary for studying the dynamics of the manipulator of the mobile robotic complex. Minimization of platform oscillations improves the characteristics of ground robotic complexes moving at a high speed.
{"title":"Study of linear and angular oscillations of the moving platform of the ground robotic complex","authors":"Sergiy Strutynskyi, Roman Semenchuk","doi":"10.20535/2521-1943.2023.7.1.266626","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.266626","url":null,"abstract":"Background Modern ground robotic complexes have a significant speed, which leads to the occurrence of vibrations of the platform and the manipulator. The problem is to develop highly efficient vehicles that take into account dynamic processes, and their impact is minimized by constructive solutions and dampers. Objective The purpose of the work is to study the dynamics of the moving platform of the robotic complex and establish its dynamic parameters. At the same time, it is necessary to determine the characteristics of oscillatory processes, in particular, linear and cross-angular movements of the platform. Methods A dynamic model of the platform has been developed. It has three degrees of freedom and takes into account the working processes of caterpillars and rollers. The calculation scheme has six points of support on the surface. The method is based on finding the position of the rollers determined by the profile of the road surface. The elastic-dissipative properties of the track and the surface are taken into account in the model. A research of the platform during its movement on a surface with a complex profile was carried out. Polyharmonic dependencies with random parameters are used to describe it. Results The developed model determine the dynamic characteristics of the robotic platform during its interaction with irregularities of arbitrary shape. Based on the found equations of spherical motion, mathematical modeling of work processes was carried out, angular coordinates and angular speeds of platform rotation were determined. Conclusions The results of modeling the spherical movement of the platform correspond to the physical essence of work processes. These data are necessary for studying the dynamics of the manipulator of the mobile robotic complex. Minimization of platform oscillations improves the characteristics of ground robotic complexes moving at a high speed.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135568760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-14DOI: 10.20535/2521-1943.2023.7.1.271548
Victor Maiboroda, Dmytro Dzhulii, Kostiantyn Zastavskyi
Background. For effective magneto-abrasive machining (MAM) of complex-shaped parts, comprehensive information is needed on the processes that occur when the magneto-abrasive tool (MAT) contacts with the surfaces being machined. Effective magneto-abrasive machining occurs in the presence of sufficient values of the normal and tangential components of the interaction forces between the MAT and the machined surfaces and the powder mixing during machining. Previously carried out analytical studies of dynamic parameters did not take into account the real conditions of the interaction of grains and their groups with machined surfaces. Objective. Complex analysis of the processes that occur during magneto-abrasive machining of parts made from different types of materials, based on the results of the study of the friction forces between the magneto-abrasive tool and the surface being machined and the drag forces during the movement of parts in the working zone of the machine. Methods. To achieve the set goal, the forces acting on the samples during their magneto-abrasive machining were measured with subsequent analytical analysis. Results. The complex analysis of the processes occurring during MAM in conditions of the annular working zone with large working gaps of parts made of various materials was carried out based on the results of the study of the friction and drag forces that occur when the part moves relative to the magneto-abrasive tool. Conclusions. It has been determined that when machining non-magnetic samples at the constant value of the magnetic field in the working zone, the specific drag forces are practically independent of the shape of the used powder. According to the analytical representation of the friction and drag forces, their ratio between their specific values was calculated. By the nature of the change in this ratio, it was found that it decreases with an increase in the velocity of samples movement along the working zone, and with an increase in the angular velocity of rotation of the samples around its axis, this value increases in the studied velocity range. It has been determined that at the velocity of movement along the working zone of 2.2 m/s, there is a slight increase in the ratio between the specific forces of friction and drag, which is associated with the action of ponderomotive forces that appear near the surface of the machined parts and lead to an increase in local magnetic forces in these zones.
{"title":"Analysis of the forces acting from the side of the magneto-abrasive tool on parts being machined during magneto-abrasive machining in conditions of the annular bath with large working gaps","authors":"Victor Maiboroda, Dmytro Dzhulii, Kostiantyn Zastavskyi","doi":"10.20535/2521-1943.2023.7.1.271548","DOIUrl":"https://doi.org/10.20535/2521-1943.2023.7.1.271548","url":null,"abstract":"Background. For effective magneto-abrasive machining (MAM) of complex-shaped parts, comprehensive information is needed on the processes that occur when the magneto-abrasive tool (MAT) contacts with the surfaces being machined. Effective magneto-abrasive machining occurs in the presence of sufficient values of the normal and tangential components of the interaction forces between the MAT and the machined surfaces and the powder mixing during machining. Previously carried out analytical studies of dynamic parameters did not take into account the real conditions of the interaction of grains and their groups with machined surfaces. Objective. Complex analysis of the processes that occur during magneto-abrasive machining of parts made from different types of materials, based on the results of the study of the friction forces between the magneto-abrasive tool and the surface being machined and the drag forces during the movement of parts in the working zone of the machine. Methods. To achieve the set goal, the forces acting on the samples during their magneto-abrasive machining were measured with subsequent analytical analysis. Results. The complex analysis of the processes occurring during MAM in conditions of the annular working zone with large working gaps of parts made of various materials was carried out based on the results of the study of the friction and drag forces that occur when the part moves relative to the magneto-abrasive tool. Conclusions. It has been determined that when machining non-magnetic samples at the constant value of the magnetic field in the working zone, the specific drag forces are practically independent of the shape of the used powder. According to the analytical representation of the friction and drag forces, their ratio between their specific values was calculated. By the nature of the change in this ratio, it was found that it decreases with an increase in the velocity of samples movement along the working zone, and with an increase in the angular velocity of rotation of the samples around its axis, this value increases in the studied velocity range. It has been determined that at the velocity of movement along the working zone of 2.2 m/s, there is a slight increase in the ratio between the specific forces of friction and drag, which is associated with the action of ponderomotive forces that appear near the surface of the machined parts and lead to an increase in local magnetic forces in these zones.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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