Effect of prestraining on Barkhausen noise vs. stress relation

Lindgren, Mari; Lepistö, Toivo

doi:10.1016/s0963-8695(00)00073-6

Cited by 63 publications

(37 citation statements)

References 20 publications

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“…The larger scattering of the points for samples in HR condition led to a lower R value. This may be caused by microstructural variations along the HR samples due to the straightening process, and was similarly seen in Figure 3 and verified by 20 in a study about the influence of pre-strain stress in MBN residual stress analysis. Such an effect is not seen in GR samples because these variations have been made more homogeneous with the heat treatments and, especially, the surface finishing process.…”

Section: Resultssupporting

confidence: 69%

Evaluation of the Residual Stress State of 42crmo4 Steel Sheets in a Production Line

et al. 2016

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Section: Resultssupporting

confidence: 69%

Evaluation of the Residual Stress State of 42crmo4 Steel Sheets in a Production Line

et al. 2016

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“…It is mainly because the magnitude of MBN signal will be influenced by the stress field at tested region, plastic deformation, grain orientation and varieties of inhomogeneous factors, which enables the relationship between MBN signal and stress not to be calibrated as shown in the work by Jagadish et al(1990). Additionally the limited power spectrum of MBN will confine its testing depth suggested in previous work by the authors (Jiles, 1996;Lindgren and Lepisto, 2001). …”

Section: Theory and Methods Of Magnetic Barkhausen Noisementioning

confidence: 97%

Magnetic Nondestructive Testing Techniques of Constructional Steel

Xiong

Zhao

Yan

et al. 2016

MATEC Web of Conferences

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Steel is a kind of ferromagnetic material, which is extensively applied in such fields as buildings, bridges, railways, machines and lifeline engineering etc. Those engineering structures built of constructional steel will unavoidably experience some damages during their service lifetime, thus which will influence the distribution regularity of internal forces in structures, result in over-stresses, cause the local failure of structures, and even lead to collapse of the whole structure. Therefore, it is a pressing topic to study how to directly evaluate the real-time stressed states of structural members, damages and steel characteristics in present structural health monitoring and diagnosing fields. And the achievements of this research will be of theoretical significance and of application value of engineering. This paper summarizes varieties of new magnetic nondestructive testing techniques used in constructional steel, respectively investigates the testing principles, characteristics and application for the magnetic Barkhausen noise technique, magnetic acoustic emission technique, magnetic flux leakage technique, magnetic memory technique and magnetic absorption technique, and points out the problems present in the application of these new techniques to actual testing and the further research objective.

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“…The magnetic moments distribute randomly in the initial state and no magnetization appears. When an external load is applied to a ferromagnetic specimen, a tension tends to orient the domains in the direction of the applied load for a positive magnetostrictive material and a compression orients the domains perpendicularly to the loading direction due to the piezomagnetic effect [23], as shown in Fig. 7.…”

Section: Figure 6 the Formation And Expansion Of The Lüders Bandsmentioning

confidence: 99%

Monitoring yield failure of ferromagnetic materials with spontaneous abnormal magnetic signals

Qiu

2015

Teh. vjesn.

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Original scientific paper Yield failure is a common failure mode of low carbon steels in practical engineering application, so detecting it timely and accurately is of great significance. Tensile tests were carried out under different loads which covered tensile elastic loads up to plastic deformation. Meanwhile, the normal components of spontaneous abnormal magnetic field, the H p (y) signals, were measured offline using the TSC-1M-4 type instrument. The correlation between the magnetic gradient K and the tension load F is discussed. The results show that the H p (y) signals, which change gradually from negative to positive, approach a straight line and have a unique zero-crossing point in the elastic stage, and the magnetic gradient K fluctuates with the load increasing. However, the distribution curve of the H p (y) signals has a peak and a trough in the yield stage, and the Lüders bands appear and expand as strain increases. The phenomenon of magnetic polarity reversal appears so that the magnetic gradient K changes from positive to negative, thus the mechanical state of the specimens can be judged from the magnetic gradient K.Keywords: magnetic domain; magnetic polarity reversal; metal magnetic memory; residual compressive stress; yield failure Praćenje izostanka popuštanja feromagnetskih materijala spontanim abnormalnim magnetskim signalima Izvorni znanstveni članak Izostanak popuštanja je uobičajena pojava kod nisko ugljičnih čelika u praktičnim inženjerskim primjenama pa je njegovo pravovremeno i točno otkrivanje od velike važnosti. Vlačni pokusi su se provodili pri različitim opterećenjima, od vlačnih elastičnih opterećenja do plastične deformacije. U međuvremenu, normalne komponente spontanog abnormalnog magnetskog polja, H p (y) signali, mjereni su samostalno, instrumentom tipa TSC-1M-4. Razmatrana je korelacija između magnetskog gradijenta K i opterećenja zbog vlaka F. Rezultati pokazuju da se H p (y) signali, koji se postepeno mijenjaju od negativnih do pozitivnih, približavaju ravnoj liniji i imaju jedinstvenu točku presjeka nultog izlaznog napona (zero-crossing point) u stadiju elastičnosti, i magnetski se gradijent K mijenja s porastom opterećenja. Međutim, krivulja raspodjele H p (y) signala dostiže vrhunac kod granice popuštanja i kako se povećava deformacija pojavljuju se i šire Lüders pojasi (Lüders bands). Javlja se fenomen promjene magnetskog polariteta tako da se magnetski gradijent K mijenja iz pozitivnog u negativni te se mehaničko stanje uzoraka može odrediti prema magnetskom gradijentu K.Ključne riječi: izostanak popuštanja; magnetsko područje; promjena magnetskog polariteta; magnetska memorija metala; zaostalo tlačno naprezanje

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Effect of prestraining on Barkhausen noise vs. stress relation

Cited by 63 publications

References 20 publications

Evaluation of the Residual Stress State of 42crmo4 Steel Sheets in a Production Line

Evaluation of the Residual Stress State of 42crmo4 Steel Sheets in a Production Line

Magnetic Nondestructive Testing Techniques of Constructional Steel

Monitoring yield failure of ferromagnetic materials with spontaneous abnormal magnetic signals

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