Results 121 to 130 of about 4,167 (169)

Magnetic Barkhausen noise: stress-dependent mechanisms in steel

IEEE Transactions on Magnetics, 1996
Angular dependent magnetic Barkhausen noise energy signal measurements were performed on two similar pipeline steel samples up to tensile stresses of 330 MPa. Variations between the stress dependence of the energy signals at five investigated positions were interpreted in terms of the relative proportion of three stress-dependent mechanisms for ...
T.W. Krause, N. Pulfer, P. Weyman, D.L. Atherton   +3 more
openaire   +1 more source

Direct observation of magnetic Barkhausen noise around grain boundaries with high-spatial-resolution magnetic Barkhausen noise sensor

Measurement Science and Technology
Abstract Magnetic Barkhausen noise (MBN) is a useful signal for non-destructively characterizing various properties of ferromagnetic materials. It is suggested that MBN is mainly generated at grain boundaries because there are more pinning sites around grain boundaries.
Qiang Zhipeng, Li Peng, Wu Bin, Wang Nan, Wang Yujue, Li Guangyong, Liu Xiucheng   +6 more
openaire   +1 more source

Barkhausen Noise and Size Effects in Magnetic Microstructures

Journal of Applied Physics, 2001
The properties of the Barkhausen noise in a series of permalloy squares have been measured with a magneto-optical hysteresigraph. The magnetic structures have been litographically defined in a permalloy film (thickness 160 nm) as squares having a size from 20 to 320 μm.
L. Callegaro, PUPPIN, EZIO
openaire   +4 more sources

Simulation of the magnetic Barkhausen noise

2020
Non-destructive magnetic controls are increasing in the industrial field 1. In this domain, the expectation for simulation tools able to anticipate the magnetic signature, improve the understanding and avoid fastidious and uncertain experimental pre-characterizations is high.
Fagan, Patrick, Ducharne, Benjamin, Daniel, Laurent, Skarlatos, Anastasios   +3 more
openaire   +1 more source

Magnetic Barkhausen Noise Testing for Subsurface Discontinuities under DC Magnetization

Materials Evaluation, 2020
Subsurface discontinuities are inevitably formed during the long-term operations of pipelines, oil tanks, ship hulls, and the like. However, it is still a big challenge to detect deeply buried subsurface discontinuities using existing nondestructive testing methods.
Chenyong Liu, Jianbo Wu, Song Ding, Zihan Wang, Yunfei Zhang   +4 more
openaire   +1 more source

MAGNETIC BARKHAUSEN NOISE INDICATORS OF CRACKS IN STEEL

Nondestructive Testing and Evaluation, 1997
High resolution magnetic Barkhausen noise (MBN) measurements were performed on cracks that were present in a section of 390 mm diameter and 29 mm thick steel pipe. The MBN indicators considered were the MBN energy signal, the number of events, and the variation of pulse height distributions (PHD) in the crack vicinity.
THOMAS W. KRAUSE, D.L. ATHERTON, S.P. SULLIVAN   +2 more
openaire   +1 more source

Plastic deformation effects on magnetic Barkhausen noise

AIP Conference Proceedings, 2000
Plastically deformed steel specimens were analyzed using surface magnetic Barkhausen noise (MBN). Three types of samples were investigated: mild steel specimens uniaxially deformed up to 40% strain, mild steel specimens deformed in bending to 0.2% longitudinal strain, cold-rolled nuclear reactor pressure vessel steel specimens from 0% to 60% reduction ...
openaire   +1 more source

Magnetic Barkhausen noise measurement by resonant coil method

Journal of Magnetism and Magnetic Materials, 2009
Abstract This paper describes a powerful new technique for nondestructive evaluation of ferromagnetic material. A method has been developed for measuring magnetic Barkhausen signals under different coil resonance frequencies. The measurements allow one to establish the behavior relating the power spectral density maximum and the resonant coil ...
J. Capó-Sánchez, L. Padovese
openaire   +1 more source

Magnetic Barkhausen Noise in Quenched Carburized Nickel-Steels

IEEE Transactions on Magnetics, 2012
Two steel sheets, one with 5% Ni and another with 10% Ni, were submitted to carburization and quenching, obtaining a microstructure with martensite and retained austenite. These steels were characterized with magnetic Barkhausen noise (MBN). The Barkhausen signal is distinctively different for the carburized and quenched samples.
E. F. Monlevade, M. F. de Campos, F. A. Franco, J. Capo-Sanchez, H. Goldenstein, L. R. Padovese   +5 more
openaire   +1 more source

Barkhausen noise in nucleation-type hard magnetic materials

Journal of Magnetism and Magnetic Materials, 2004
Abstract The Barkhausen effect was experimentally investigated in sintered NdFeB hard magnetic materials. We analyzed noise properties along different magnetization curves. The jumps are associated with the reversal of single grains or of groups of grains.
BASSO, VITTORIO, BEATRICE, CINZIA, BERTOTTI G, DURIN, GIANFRANCO, LO BUE M, SASSO, CARLO PAOLO   +5 more
openaire   +1 more source