Effect of Plastic Deformation on the Excess Loss of Electrical Steel

Rodrigues, Daniel; Silveira, João Ricardo Filipini da; Gerhardt, Günther J.L.; Missell, F.P.; Landgraf, Fernando José Gomes; Machado, R.; Campos, Marcos Flávio de

doi:10.1109/tmag.2011.2174214

Cited by 30 publications

(11 citation statements)

References 14 publications

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“…The normalized power index is defined as an idea of the locations of the different regions which we here refer to as "burst" and "background". The burst region corresponds to the main BN signal, while the background corresponds mainly to the higher field region where Barkhausen noise is not observed 16,17 . This subdivision is important for the index we define in the next section.…”

Section: Resultsmentioning

confidence: 99%

Case depth in SAE 1020 steel using barkhausen noise

2013

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The most widely used thermochemical process for surface hardening of steels is case hardening. Using several different heat treatments, martensitic surface layers were formed on SAE 1020 steel into which carbon had been diffused. Case depths were measured by traditional destructive techniques. Barkhausen noise measurements were made and both the RMS Barkhausen pulse envelope and the fast Fourier transform (FFT) were obtained from numerical calculation. The FFT amplitudes, functions of frequency, were associated with distance from the sample surface using the skin depth equation½ , where f is the frequency of the electromagnetic wave, s is the electrical conductivity, and μ is the magnetic permeability. We define a normalized power index (NPI) which can be used to estimate case depths. The NPI is discussed in relation to the sample microstructure and it is shown that the case depth is most easily determined when the magnetic properties of the surface layer and core are substantially different.

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Section: Resultsmentioning

confidence: 99%

Case depth in SAE 1020 steel using barkhausen noise

2013

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“…It is also relevant to distinguish the macrostresses (i.e., the residual stresses) from the microstresses, which are due to dislocations. The microstresses can be assessed from X-ray diffraction data [17][18][19]. Dislocations present stress field of high order (near 1 GPa) [20].…”

Section: Comparison With Other Techniques As X-ray Diffractionmentioning

confidence: 99%

Interpretation of Magnetic Barkhausen Noise Bursts in Low Frequency Measurements

et al. 2019

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Experimental results allow the identification of three main magnetic Barkhausen noise bursts, each occurring at a different applied field. Magnetostrictive effects can be related to the 1st and 3rd bursts, because closure domain walls are created and/or eliminated. The 2nd burst occurs at the coercive field and it is usually the most intense, and is attributed to domain wall movement. The analysis of the three main bursts gives an important insight on how stress may affect the losses and magnetic Barkhausen noise. A brief review is also presented about the magnetic Barkhausen noise technique.

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“…The study of plastic deformation is probably due to the need of controlling the shaping and use of materials. As a result, this has long been empirical and it is only in recent decades that the concepts necessary to understand the physical phenomena that occur during plastic flows have been developed [15][16][17]. For crystalline solids, the basic mechanisms are fairly well known, but the effect of plastic deformation on shielding efficiency (electrical parameters) is poorly known and is currently a promising area of research [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers [13,[15][16] obtained preliminary results, studying the effect of the interaction of dislocations that interact during plastic deformation on electrical properties. In the present work, we study the effect of plastic deformation on shielding immunity of copper against electromagnetic interference (EMI).…”

Section: Introductionmentioning

confidence: 99%

Influence of Plastic Deformation of Copper on the Behavior of Electromagnetic Shielding

Elhadi¹,

Hadjadj²,

Gaoui³

et al. 2019

ACSM

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Nowadays, one of the main reasons for increasing material performances is the need to reduce electromagnetic interference (EMI) generated by high-frequency electronic circuits, which is a serious problem in terms of equipment performances. For this purpose, copper is one of the most used materials for shielding applications. Plastic deformation at the macroscopic scale generates at the microscopic scale many moving dislocations (internal stresses) affecting the efficiency of the electromagnetic shielding. However, the plastic deformation which affects the electrical properties ensuring the shielding properties is still badly known and should be more studied and constitutes a promising research field. The main objective of this work is to study the effect of the copper plastic deformation on its electromagnetic shielding efficiency in the ]0-1GHz] frequency range. A series of electromagnetic shielding experiments was carried out by means of an Electro Magnetic Dual Transverse Cell (DTEM), on copper samples with a purity level of 99 % i) without plastic deformation ii) deformed with a rate of 2 % and 3 %. The results obtained clearly shown the variation of the electromagnetic shielding efficiency as a function of the copper plastic deformation rate.

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Effect of Plastic Deformation on the Excess Loss of Electrical Steel

Cited by 30 publications

References 14 publications

Case depth in SAE 1020 steel using barkhausen noise

Case depth in SAE 1020 steel using barkhausen noise

Interpretation of Magnetic Barkhausen Noise Bursts in Low Frequency Measurements

Influence of Plastic Deformation of Copper on the Behavior of Electromagnetic Shielding

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