| Full text | |
| Author(s): |
Franco, Freddy A.
[1]
;
Padovese, L. R.
Total Authors: 2
|
| Affiliation: | [1] Univ Sao Paulo, Escola Politecn, Dept Engn Mecan, LADIN, BR-05508970 Sao Paulo - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | NDT & E INTERNATIONAL; v. 42, n. 8, p. 721-728, DEC 2009. |
| Web of Science Citations: | 4 |
| Abstract | |
This paper reports the use of a non-destructive, continuous magnetic Barkhausen noise (CMBN) technique to investigate the size and thickness of volumetric defects, in a 1070 steel. The magnetic behavior of the used probe was analyzed by numerical simulation, using the finite element method (FEM). Results indicated that the presence of a ferrite coil core in the probe favors MBN emissions. The samples were scanned with different speeds and probe configurations to determine the effect of the flaw on the CMBN signal amplitude. A moving smooth window, based on a second-order statistical moment, was used for analyzing the time signal. The results show the technique's good repeatability, and high capacity for detection of this type of defect. (C) 2009 Elsevier Ltd. All rights reserved. (AU) | |