Розрахунковий метод оцінювання впливу електромагнітних полів на пружно-пластичне деформування обладнання технологічних приладів
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Дата
2021
ORCID
DOI
Науковий ступінь
доктор технічних наук
Рівень дисертації
докторська дисертація
Шифр та назва спеціальності
05.02.09 – динаміка та міцність машин
Рада захисту
Спеціалізована вчена рада Д 64.050.10
Установа захисту
Національний технічний університет "Харківський політехнічний інститут"
Науковий керівник
Морачковський Олег Костянтинович
Члени комітету
Львов Геннадій Іванович
Морачковський Олег Костянтинович
Ларін Олексій Олександрович
Морачковський Олег Костянтинович
Ларін Олексій Олександрович
Видавець
Національний технічний університет "Харківський політехнічний інститут"
Анотація
Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.02.09 – динаміка та міцність машин. – Національний технічний університет “Харківський політехнічний інститут”, Харків, 2021 р. Дисертаційну роботу присвячено розробці нового розрахункового методу оцінювання впливу електромагнітних полів (ЕМП) на пружно-пластичне дефо-рмування складених тіл з урахуванням зв’язаності механічних, електромагнітних та теплових полів, та застосуванню цього методу для дослідження деформування обладнання технологічних приладів, які знаходяться під дією імпульсного ЕМП. Представлено загальну постановку проблеми створення розрахункового методу оцінювання дії ЕМП на деформування систем електропровідних тіл. Розглянуті загальні балансові співвідношення, які зв’язують основні характеристики ЕМП, теплового поля та напружено-деформованого стану (НДС), і надають змогу сформулювати визначальні рівняння. Сформульовано повну систему диференціальних рівнянь початково-крайової задачі пружно-пластичного деформування систем електропровідних тіл при дії ЕМП та наявності теплового поля. Чисельна реалізація методу спирається на метод скінченних елементів (МСЕ). Явище контактної взаємодії запропоновано враховувати шляхом введення спеціального контактного шару, властивості якого обираються так, щоб коректно моделювати реальні умови взаємодії. Запропоновано та обґрунтовано загальний підхід до визначення характеристик ЕМП та НДС у технологічних системах магнітно-імпульсної обробки ма-теріалів (МІОМ), згідно до якого передбачається використання запропонованого розрахункового методу для розрахункової схеми, яка має містити індуктор та заготовку. Проведені розрахунки ЕМП та НДС обладнання технологічних систем МІОМ, за результатами яких визначені раціональні експлуатаційні та конструкційні параметри технологічних операцій.
Thesis for granting the Degree of Doctor of Technical sciences in specialty 05.02.09 – Dynamics and Strength of Machines. – National Technical University “Kharkiv Politechnical Institute”, 2021. The thesis is devoted to the development of a new calculation method for evaluating the effect of electromagnetic fields on elastic-plastic deformation of composite bodies, taking into account the relationship between mechanical, electromagnetic and thermal fields, and the application of this method to study the deformation of blanks and equipment of technological devices that are under the action of a pulsed electro-magnetic field. A large number of technical and technological facilities are exploited under conditions of intense electromagnetic fields (EMF). Technologies that use EMF, cause a variety of power, thermal effects on materials, influence on magnetic properties, and so on. The most important is the power effect that occurs when the EMF acts on the conductive body and causes its movement or deformation. Force influence is used in the class of technological operations, called magnetic-pulsed material processing (MPMP). The scientific and applied problem, which consists in the creation of new calculation methods for evaluating the EMF's effect on elastic-plastic deformation of workpieces and equipment, taking into account the association of EMF propagation and deformation processes, as well as calculation investigations of the processes of EMF distribution and deformation under the conditions of specific technological operations is relevant, which determines the direction of the dissertation research. A general statement of the problem of creating a calculation method for the evaluation of the EMF on the deformation of electrically conducting bodies is made. The general balance relations, which connect the main characteristics of the EMF, the thermal field and the stress strain state (SSS), are considered, and allow to formulate the defining equations and state equations. The model for taking into account the in-fluence of EMF on the process of body deformation and the propagation of the ther-mal field for the case of neglecting the manifestations of piezoelectric, magnetic-electric, thermoelectric and thermomagnetic effects is considered. It is assumed that the characteristics of the material may depend on temperature, and the magnetic permeability for some materials is a function of the magnetic field strength. This model is grounded and applied to specific processes and materials. A complete system of differential equations for the initial boundary value problem of elastic-plastic defor-mation of electrically conducting bodies systems under the influence of EMF and the presence of a thermal field is formulated. The ratio for the main characteristics of EMF is taken within the framework of macroscopic electrodynamics, the ratio of plastic deformation taken in accordance with the associated theory of flow. The phenomenon of contact interaction is proposed to be taken into account by introducing a special contact layer, the properties of which are selected so as to correctly model the real conditions of interaction. The variational formulation of the problem for the case of elastic deformation and quasi-stationary EMF propagation is made on the basis of the principle of stationary power of the whole system. It is shown that in the case when the connection between the mechanical field and the EMF occurs only in the presence of electromagnetic forces, a consistent solution of the problems of determi-nation of EMF components and SSS is possible. For the general case of propagation of EMF, non-stationary thermal field and elastic deformation, variational formulation is presented. The variational formulation in the case of plastic deformation according to the theory of flow is widely used, taking into account the dependence of the main characteristics on temperature. A finite-element implementation was proposed, as the basic one, an eight-node isoparametric finite element was selected with a bilinear ap-proximation of the desired functions. The thesis proposes and substantiates the general approach to the definition of characteristics of EMF and SSS in MPMP techno-logical systems, which provides for the use of the proposed calculation method for the calculation scheme, which should include the inductor and the workpiece. The solution of the problem of determining the spatial-temporal distributions of the main characteristics of EMF in the conditions of the technological operation of MPMP by drawing thin blanks from ferromagnetic materials is carried out. Using the proposed calculation method based on the spatial-temporal distributions of the EMF component, a study of elastic-plastic deformation of the workpiece and a composite single- and multiturn inductors, taking into account the contact interaction, was carried out. The ranges of values of the operating and structural parameters of the inductor are determined, in which it remains operational. The analysis of elastic-plastic deformation of the inductor together with the workpiece allowed to de-termine the limits of its application and to determine the rational values of some structural and operational parameters.
Thesis for granting the Degree of Doctor of Technical sciences in specialty 05.02.09 – Dynamics and Strength of Machines. – National Technical University “Kharkiv Politechnical Institute”, 2021. The thesis is devoted to the development of a new calculation method for evaluating the effect of electromagnetic fields on elastic-plastic deformation of composite bodies, taking into account the relationship between mechanical, electromagnetic and thermal fields, and the application of this method to study the deformation of blanks and equipment of technological devices that are under the action of a pulsed electro-magnetic field. A large number of technical and technological facilities are exploited under conditions of intense electromagnetic fields (EMF). Technologies that use EMF, cause a variety of power, thermal effects on materials, influence on magnetic properties, and so on. The most important is the power effect that occurs when the EMF acts on the conductive body and causes its movement or deformation. Force influence is used in the class of technological operations, called magnetic-pulsed material processing (MPMP). The scientific and applied problem, which consists in the creation of new calculation methods for evaluating the EMF's effect on elastic-plastic deformation of workpieces and equipment, taking into account the association of EMF propagation and deformation processes, as well as calculation investigations of the processes of EMF distribution and deformation under the conditions of specific technological operations is relevant, which determines the direction of the dissertation research. A general statement of the problem of creating a calculation method for the evaluation of the EMF on the deformation of electrically conducting bodies is made. The general balance relations, which connect the main characteristics of the EMF, the thermal field and the stress strain state (SSS), are considered, and allow to formulate the defining equations and state equations. The model for taking into account the in-fluence of EMF on the process of body deformation and the propagation of the ther-mal field for the case of neglecting the manifestations of piezoelectric, magnetic-electric, thermoelectric and thermomagnetic effects is considered. It is assumed that the characteristics of the material may depend on temperature, and the magnetic permeability for some materials is a function of the magnetic field strength. This model is grounded and applied to specific processes and materials. A complete system of differential equations for the initial boundary value problem of elastic-plastic defor-mation of electrically conducting bodies systems under the influence of EMF and the presence of a thermal field is formulated. The ratio for the main characteristics of EMF is taken within the framework of macroscopic electrodynamics, the ratio of plastic deformation taken in accordance with the associated theory of flow. The phenomenon of contact interaction is proposed to be taken into account by introducing a special contact layer, the properties of which are selected so as to correctly model the real conditions of interaction. The variational formulation of the problem for the case of elastic deformation and quasi-stationary EMF propagation is made on the basis of the principle of stationary power of the whole system. It is shown that in the case when the connection between the mechanical field and the EMF occurs only in the presence of electromagnetic forces, a consistent solution of the problems of determi-nation of EMF components and SSS is possible. For the general case of propagation of EMF, non-stationary thermal field and elastic deformation, variational formulation is presented. The variational formulation in the case of plastic deformation according to the theory of flow is widely used, taking into account the dependence of the main characteristics on temperature. A finite-element implementation was proposed, as the basic one, an eight-node isoparametric finite element was selected with a bilinear ap-proximation of the desired functions. The thesis proposes and substantiates the general approach to the definition of characteristics of EMF and SSS in MPMP techno-logical systems, which provides for the use of the proposed calculation method for the calculation scheme, which should include the inductor and the workpiece. The solution of the problem of determining the spatial-temporal distributions of the main characteristics of EMF in the conditions of the technological operation of MPMP by drawing thin blanks from ferromagnetic materials is carried out. Using the proposed calculation method based on the spatial-temporal distributions of the EMF component, a study of elastic-plastic deformation of the workpiece and a composite single- and multiturn inductors, taking into account the contact interaction, was carried out. The ranges of values of the operating and structural parameters of the inductor are determined, in which it remains operational. The analysis of elastic-plastic deformation of the inductor together with the workpiece allowed to de-termine the limits of its application and to determine the rational values of some structural and operational parameters.
Опис
Ключові слова
автореферат дисертації, пружно-пластичне деформування, електромагнітне поле, метод скінчених елементів, контактна взаємодія, електромагнітні сили, магнітно-імпульсна обробка матеріалів, elastic-plastic deformation, electromagnetic field, finite element method, contact interaction, electromagnetic forces, magnetic pulse processing of materials
Бібліографічний опис
Лавінський Д. В. Розрахунковий метод оцінювання впливу електромагнітних полів на пружно-пластичне деформування обладнання технологічних приладів [Електронний ресурс] : автореф. дис. ... д-ра техн. наук : спец. 05.02.09 / Денис Володимирович Лавінський ; [наук. консультант Морачковський О. К.] ; Нац. техн. ун-т "Харків. політехн. ін-т". – Харків, 2021. – 39 с. – Бібліогр.: с. 29-36. – укр.