Effect of prestraining on Barkhausen noise vs. stress relation

Citation
M. Lindgren et T. Lepisto, Effect of prestraining on Barkhausen noise vs. stress relation, NDT E INT, 34(5), 2001, pp. 337-344
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
NDT & E INTERNATIONAL
ISSN journal
0963-8695 → ACNP
Volume
34
Issue
5
Year of publication
2001
Pages
337 - 344
Database
ISI
SICI code
0963-8695(200107)34:5<337:EOPOBN>2.0.ZU;2-5
Abstract
Mild steel specimens were uniaxially strained in tension at strain levels v arying from 0.5 to 10% followed by X-ray diffraction residual stress and Ba rkhausen noise (BN) measurements. After this tension and compression loadin g was applied to the specimens. BN measurements were carried out during the whole reloading sequence. These measurements showed that prestrain increas ed the tensile stress value at which the BN saturated. The linear range of the stress vs. BN curve shifted towards the tensile stress range as a funct ion of prestrain. In the linear range the stress sensitivity remained uncha nged despite the prestrain. The obtained stress vs. BN relation was used in the residual stress measurements of a welded tube segment. The residual st ress values measured by the BN were compared to X-ray diffraction residual stress values. When the BN values were within the linear range of the stres s vs. BN curve, the BN residual stress values agreed quite well with the X- ray diffraction residual stress values. (C) 2001 Elsevier Science Ltd. All rights reserved.