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Plastic versus elastic deformation effects on magnetic Barkhausen noise in steel [J

By C. -g. Stefanita, D. L. Atherton and L. Clapham

Abstract

Abstract—A study was performed to dierentiate the eects of elastic and plastic deformation on magnetic Barkhausen noise (MBN) signals. Linear and angular MBN measurements were made on a number of mild steel plate samples subjected to varying degrees of uniaxial elastic and plastic deformation up to 040 % strain. Elastic strain eects on the MBNenergy were determined to be far more significant than plas-tic strain eects. MBNenergy increases in the early plastic deformation region were attributed to a slight increase in elastic strain due to work hardening. Magnetic anisotropy studies indicated that elastic strain significantly alters the magnetic anisotropy (a) in the sample, but changes the isotropic signal (b) very lit-tle. Plastic deformation has a smaller, but apparently opposite eect, in that it appears to change b but has little influence on a. As plastic deformation levels become large, however, behaviour becomes more com

Topics: Magnetic methods, Steel, Mechanical properties—elastic and plastic
Year: 2000
OAI identifier: oai:CiteSeerX.psu:10.1.1.544.2887
Provided by: CiteSeerX
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