Electromagnetic Forming Processes: Material Behaviour and Computational Modelling

Bay, François; Jeanson, Anne-Claire; Zapata, José-Rodolfo Alves

doi:10.1016/j.proeng.2014.10.078

Cited by 9 publications

(5 citation statements)

References 3 publications

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“…A numerical toolbox based on finite elements methods for the electromagnetic forming applications has been developed to solve electromagnetic forming problems [31,32]. This toolbox is a coupling between FORGE-for the mechanical modeling of large deformationand MATELEC-which solves the electromagnetic wave propagation problem-based on the Maxwell's equations.…”

Section: Modeling Of the Magnetic Pulse Forming Processmentioning

confidence: 99%

An Efficient Computational Model for Magnetic Pulse Forming of Thin Structures

2021

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Electromagnetic forming (EMF) is one of the most popular high-speed forming processes for sheet metals. However, modeling this process in 3D often requires huge computational time since it deals with a strongly coupled multi-physics problem. The numerical tools that are capable of modeling this process rely either on shell elements-based approaches or on full 3D elements-based approaches. The former leads to reduced computational time at the expense of the accuracy, while the latter favors accuracy over computation time. Herein, a novel approach was developed to reduce CPU time while maintaining reasonable accuracy through building upon a 3D finite element analysis toolbox which was developed in CEMEF. This toolbox was used to solve magnetic pulse forming (MPF) of thin sheets. The problem was simulated under different conditions and the results were analyzed in-depth. Innovative techniques, such as developing a termination criterion and using adaptive re-meshing, were devised to overcome the encountered problems. Moreover, a solid shell element was implemented and tested for thin structure problems and its applicability was verified. The results of this element type were comparable to the results of the standard tetrahedral MINI element but with reduced simulation time.

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Section: Modeling Of the Magnetic Pulse Forming Processmentioning

confidence: 99%

An Efficient Computational Model for Magnetic Pulse Forming of Thin Structures

2021

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“…Нові можливі напрями розвитку магнітноімпульсної обробки тонкостінних металів з відповідним фізичним обґрунтуванням кожного з них були представлені авторами публікацій [6][7][8][9][10][11][12]. Приклад такого обладнання наведено на рис.…”

Section: фізична сутність процесів що протікаютьunclassified

“…Основний струмопровід індуктора електрично з'єднується з ділянкою металу, що підлягає деформуванню, так, що провідники з'єднуються паралельні, а струми, що протікають по них, односпрямовані. Відповідно до закону Ампера ці провідники відчуватимуть тяжіння [9][10][11][12][13].…”

Section: фізична сутність процесів що протікаютьunclassified

Application and schemes of induction preliminary heating in magnetic-pulse treatment of metals

Gavrylova¹,

Чаплыгин²,

Shynderuk³

2021

Вісник НТУ "ХПІ"

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The features of the processes of magnetic-pulse processing of metals in traditional schemes of technological processes of modern industrial production are highlighted. The work is a brief description of the state, application, and also proposed induction pre-heating schemes in industrial magnetic-pulse processing of metals. A method for increasing the efficiency of performing specified production operations is considered. The use of preheating leads to a significant improvement in the quality of production operations while reducing energy consumption. New directions of magnetic-pulse processing of metals are noted, implying the transformation of the natural repulsive forces of the metal of the processed object into the forces of magnetic-pulse attraction with a decrease in the operating frequencies of the acting fields. A significant decrease in operating frequencies makes it possible not only to go from repulsion to attraction, but also to go from working with ferromagnetic metals to non-ferromagnetic ones. For example, it becomes possible to attract aluminum blanks. Examples of the use of induction heating of metal blanks in modern industry are given. Various devices used for these operations, offered on the modern market, by both domestic and foreign manufacturers, are considered. The physics of Lenz-Joule heat release is described, the result of which is the induction heating of conductors by Foucault currents in the external electromagnetic field of the instrument. Schemes are proposed for the practical implementation of preliminary induction heating during magnetic-pulse processing of metal blanks, allowing the use of both autonomous devices for exciting eddy currents and a stationary connection, for the same purpose, of an additional source of electricity. As a result of the work, the possibility of increasing the efficiency by increasing the plasticity of the metal when heating the workpiece, as well as possible limitations of the described technology associated with an increase in the active resistance of metals with an increase in the Lenz-Joule heat release is noted.

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“…Thus, multi-turn inductor systems in the classic magnetic pulse processing of metals, which became widespread in the second half of the last century, carried out effective deformation of massive metal workpieces. In the case of a sharp skin effect (high frequencies of active fields), production operations such as «crimping», «dispensing» and «flat stamping» have been successfully implemented [8][9][10]. It should be emphasized that the principle of operation of the presented electromagnetic technologies is based on the natural repulsion of conductors from the sources of the external magnetic field, which manifests itself as the so-called «magnetic pressure» [4,11].…”

Section: Introductionmentioning

confidence: 99%

The mutual influence of exciting and induced currents in the circular solenoid – massive conductor system

Batygin,

Yeryomina,

Shinderuk

et al. 2023

Electrical Engineering & Electromechanics

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Problem. The flow of currents in the conductive elements of electrical systems is accompanied by the excitation of electromagnetic fields and the occurrence of induced currents. The excitation of the induced signals, in turn, leads to a change in the parameters of the actual exciting currents. The purpose of the work is to obtain analytical expressions for the quantitative analysis of the results of the mutual influence of the exciting and induced currents and to calculate their ratio depending on the geometric characteristics of the inductor systems. Methodology. The analysis of the processes of mutual influence is carried out on the example of a widespread inductor system, where a flat circular solenoid is placed above the surface of a massive conductor. Analytical expressions for eddy currents excited in a massive conductor and numerical estimates of the effect of induced currents on exciting currents in a solenoid are obtained. Results. It is shown that the influence of the induced current on the current in the solenoid is very significant at small distances between the solenoid and the surface of the massive solenoid. It has been found that an increase in the width of the solenoid winding leads to a significant increase in the influence of the induced current on the excitation current in the solenoid. It is shown that the inductance of the «circular solenoid - massive conductor» system drops with a decrease in the distance between the solenoid and the massive conductor and an increase in the radial dimensions of the solenoid, which requires an increase in the amplitude of the exciting current to maintain a given value of the magnetic flux in the system. Originality. The scientific novelty of this work lies in the proposal of an analytical approach and obtaining numerical estimates of the mutual influence of conductors with exciting and induced currents. Practical value. Estimates of the mutual influence of conductors with currents are of interest for the practice of designing structures of electrical systems for various purposes. Very promising in the direction further research is seen as carrying out experiments with measurements of the quantitative characteristics of the mutual influence of exciting and induced currents in various designs of electrical systems.

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Electromagnetic Forming Processes: Material Behaviour and Computational Modelling

Cited by 9 publications

References 3 publications

An Efficient Computational Model for Magnetic Pulse Forming of Thin Structures

An Efficient Computational Model for Magnetic Pulse Forming of Thin Structures

Application and schemes of induction preliminary heating in magnetic-pulse treatment of metals

The mutual influence of exciting and induced currents in the circular solenoid – massive conductor system

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