Finite deformations of metal cylinders subjected to electromagnetic fields and mechanical forces

Bilyk, Stephan; Ramesh, K.T.; Wright, Thomas W.

doi:10.1016/j.jmps.2004.10.002

Cited by 33 publications

(17 citation statements)

References 23 publications

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“…Third subsection is about the approach of Bilyk et al [35]. Their conclusions contradict the prior works, in particular those reviewed in this report.…”

Section: Comparison Of Different Theoretical Models With Experimentalcontrasting

confidence: 50%

“…The theories not only cannot be expressed one through other, but they also do not exclude one another. So, for example, thermal expansion at big rate, that is told of by Bilyk et al and Unger et al [34,35], does not prohibit the magnetic field influence upon the spins of dopants and pinned dislocation cores, that are involved in Molotskii's model [32][33][34]. Other mechanisms are also not discarded.…”

Section: Resultsmentioning

confidence: 99%

“…For checking Bilyk's et al model [35,36], it is necessary to separate fast heating from electromagnetic influence.…”

Section: Resultsmentioning

confidence: 99%

“…The term in the denominator, considering the remarks regarding (35), should also be discarded. The following should have been obtained…”

mentioning

confidence: 99%

“…At the transition from (35) to (37), we have taken into account the fact that in case of current density that is uniformly distributed over the cross-section of the conductor, the value H of the magnetic field strength grows with the distance from the axis of the sample. But, the parameter H 0 is the property of the material and depends neither of the size of the sample, nor on the coordinates in the bulk of this sample.…”

mentioning

confidence: 99%

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Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Karas

Karasyova

Mats

et al. 2016

Metallofiz. Noveishie Tekhnol.

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The results of the investigation of creep characteristics and activation parameters of polycrystalline nickel (of 99.996% purity) plastic flow at the temperature of 77 K are presented. The influence of nonstationary magnetic field with strength of 500 Oe (harmonic (50 Hz) and monopolar pulses of the same frequency) on the nickel creep characteristics is studied. We have deliberately conducted experimental investigations of the influence of nonstationary magnetic field of alternating and constant sign at constant temperature in order to estimate the contribution to the dislocations' mobility from the interaction of dislocations with the mobile domain boundaries as well as from the heat effects connected with the induction electric field. The proposed model of electroplastic effect (EPE) suggests the following mechanism of weakening under the action of electric field. Electric field gives energy to conductivity electron subsystem, making it thermodynamically nonequilibrium. Nonequilibrium electrons while interacting with acoustic phonons transfer more energy to short-wave part of the phonon spectrum. Short-wave phonons due to large stress gradient effectively detach dislocations from stoppers. Experimental results qualitatively match with the data obtained after numerical calculations.Key words: magnetoplastic effect, alternating magnetic field, dislocation mobility, creep rate, ferromagnetic crystal, nonequilibrium electron and phonon subsystem.Наведено результати досліджень характеристик плазучости та актива-ційних параметрів пластичної течії полікристалічного ніклю (99,996% чистоти) за постійної температури у 77 К. Досліджувався вплив нестаціо-нарного магнетного поля напруженістю у 500 Е (гармонічні (50 Гц) та од-нополярні імпульси тієї ж частоти) на параметри плазучости ніклю. Екс-периментальні дослідження з впливу нестаціонарного магнетного поля змінного та сталого знаку за постійної температури проводилися, щоб оцінити внесок у рухливість дислокацій від взаємодії дислокацій з рух-ливими межами домен, а також від теплових ефектів, пов'язаних з індук-ційним електричним полем. Пропонований модель електропластичного ефекту (ЕПЕ) передбачає наступний механізм знеміцнення під дією елек-тричного поля. Електричне поле передає енергію підсистемі електронів провідности, роблячи її термодинамічно нерівноважною. Нерівноважні електрони, що взаємодіють з акустичними фононами, передають енергію переважно короткохвильовій частині фононного спектру. Короткохви-льові фонони, завдяки великому ґрадієнту напруги, ефективно відкріп-люють дислокації від стопорів. Результати експериментів якісно збіга-ються з даними числових розрахунків.Ключові слова: магнетопластичний ефект, змінне магнетне поле, рухли-вість дислокацій, швидкість плазучости, феромагнетний кристал, нерів-новажна електронна та фононна підсистеми.Представлены результаты исследования характеристик ползучести и ак-тивационных параметров пластического течения поликристаллического никеля (99,996% чистоты) при температуре 77 К. Было изучено влияние нестационарного магнитн...

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“…Third subsection is about the approach of Bilyk et al [35]. Their conclusions contradict the prior works, in particular those reviewed in this report.…”

Section: Comparison Of Different Theoretical Models With Experimentalcontrasting

confidence: 50%

Section: Resultsmentioning

confidence: 99%

“…For checking Bilyk's et al model [35,36], it is necessary to separate fast heating from electromagnetic influence.…”

Section: Resultsmentioning

confidence: 99%

“…The term in the denominator, considering the remarks regarding (35), should also be discarded. The following should have been obtained…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Karas

Karasyova

Mats

et al. 2016

Metallofiz. Noveishie Tekhnol.

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One Step Forward to Electrically Assisted Forming Mechanisms and Computer Simulation: A Review

Izadpanah

Cao

2022

Adv Eng Mater

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The electrically assisted forming (EAF) is a hybrid manufacturing process that utilizes electric current energy to improve the productivity and efficiency of the forming process. Many studies have been accomplished to investigate the effect of process parameters on its forming abilities, including pulse current effect, grain size, and current duration. There is currently a lack of agreement on the underlying mechanisms of the electroplastic effect to the formability of metallic materials through EAF, specifically on the Joule heating and electric wind's contributions. One promising solution to this dilemma is the application of computer simulation techniques for a better understanding of the physics of EAF. Therefore, this paper provides a brief review of the previous research studying the modeling of EAF and offers new solutions aiming to further the understanding of the underlying physics of this process through computer simulation approaches.

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On the influence of electric currents on plastic deformation

Unger

Stiemer

Svendsen

et al. 2006

Proc Appl Math and Mech

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Electromagnetic sheet metal forming (EMF) is a high‐speed forming process driven by the dynamics of a coupled electromagneticmechanical system. The purpose of the current work is the investigation of a possible reduction in the yield stress due to electric currents. While thermoelastic and viscoplastic effects are well‐understood, the possible influence of electric currents on dislocation motion, generally referred to as the electro‐plastic effect [3], is still an unresolved issue. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Finite deformations of metal cylinders subjected to electromagnetic fields and mechanical forces

Cited by 33 publications

References 23 publications

Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

Influence of Alternating Magnetic Field on Physical and Mechanical Properties of Crystals

One Step Forward to Electrically Assisted Forming Mechanisms and Computer Simulation: A Review

On the influence of electric currents on plastic deformation

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