Memory dependence of Barkhausen emission

Erber, T.; Porteseil, J.L.; Molho, P.

doi:10.1080/01418638508241886

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Intermittent crack movements in stressed ferromagnets can generate simultaneous magnetic and acoustic pulses [30,31]. Because of their refined stress sensitivity, these effects have been incorporated into several commercially available NDE instruments [32][33][34][35][36][37][38][39][40][41][42].…”

Section: Magnetomechanical Effectsmentioning

confidence: 99%

Piezomagnetism and fatigue

Erber

Guralnick

Desai

et al. 1997

J. Phys. D: Appl. Phys.

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Piezomagnetism refers to a change in the intrinsic magnetization of a material subjected to mechanical actions such as tension or compression. In a ferromagnet such as a mild steel these effects are easily measured: typically a stress of or 140 MPa induces a magnetic moment of the order of emu or , resulting in flux densities in the range 10 mG or T in the vicinity of the specimen. Since piezomagnetic effects are due to interactions between the mechanical and magnetic mesostructure of materials microplastic processes that alter the arrangement of the ferromagnetic domain structure affect the intensity of the associated magnetic fields. The progressive degradation of such materials under cyclic loading can therefore be tracked by following the evolution of the piezomagnetic field. Specifically, if the measurements are displayed as loci in a three-dimensional stress - strain - field (B) space, the approach to fatigue failure is paralleled by a series of conspicuous geometric transformations of these curves. Complementary information also appears in continuous-time records of B(t): these magnetograms clearly show the abrupt incidence of `infarcts' (microcracks) and the cumulation of phase shifts as the material degrades.

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Section: Magnetomechanical Effectsmentioning

confidence: 99%

Piezomagnetism and fatigue

Erber

Guralnick

Desai

et al. 1997

J. Phys. D: Appl. Phys.

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Hysteresis and incremental collapse: The iterative evolution of a complex system

Erber

Guralnick

1988

Annals of Physics

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Training of Barkhausen emission in nickel and iron

Weinstock¹,

Erber

1988

Journal of Applied Physics

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Barkhausen emission from annealed nickel and iron was measured with a SQUID gradiometer that could detect magnetization jumps above a noise level of 3×10−8 emu. The equipment was installed in a three-axis 12.7-m-diam Braunbeck coil system at NASA’s Goddard Space Flight Center. This arrangement provided an overall cancellation of the geomagnetic field to ±10−6 Oe, and a field homogeneity of 0.001% over a spherical volume of 24.4 m3. Auxiliary windings in the Braunbeck coils were used to generate uniform magnetizing fields at sweep rates as slow as 0.81 μOe/s. The nickel measurements were carried out in field ranges that interpolated between those used in previous training experiments with iron and gadolinium samples. In all cases, repeated field sweeps eliminated or diminished the Barkhausen signals in a systematic way paralleling the Kaiser effect in acoustic emission. These results can be related to the training behavior predicted by a general hysteresis theory.

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Memory dependence of Barkhausen emission

Cited by 4 publications

References 8 publications

Piezomagnetism and fatigue

Piezomagnetism and fatigue

Hysteresis and incremental collapse: The iterative evolution of a complex system

Training of Barkhausen emission in nickel and iron

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