caa a22 4500 606172939 CHVBK 20210128100730.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s10921-015-0293-9 doi (NATIONALLICENCE)springer-10.1007/s10921-015-0293-9 A Methodology for Identifying Defects in the Magnetic Flux Leakage Method and Suggestions for Standard Specimens [Elektronische Daten] [Yanhua Sun, Bo Feng, Shiwei Liu, Zhijian Ye, Shaobo Chen, Yihua Kang] In magnetic flux leakage (MFL) testing technology, the MFL signals are thought to result from all defects and are used in their evaluation. The tested defects include two types of defects, concave and bump-shaped features, and recently described mechanisms in the MFL method indicate that the former defects produce positive MFL because of magnetic refraction and the latter ones produce negative magnetic fields because of self-magnetization regulation; consequently, these defects result in raised test signal waves and sunken test signal waves, respectively. Thereby, a new methodology for accurately identifying the defect type based on the mapping relation between the signal features and defect types is proposed. Both simulations and experiments with three representative defects (i.e., notch, protrusion and combination) were conducted to confirm their identification using this new methodology. Combined with MFL standards such as American Society for Testing and Materials (ASTM) E570-09 (Standard Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products, 2009) and British Standards (BS) EN 10246-4 (Non-destructive Testing of Steel Tubes—Part 4: Automatic Full Peripheral Magnetic Transducer/Flux Leakage Testing of Seamless Ferromagnetic Steel Tubes for the Detection of Transverse Imperfections, 2007), suggestions for standard specimens with reference defects that consist of both types of defects are provided. Springer Science+Business Media New York, 2015 Magnetic flux leakage (MFL) nationallicence Nondestructive evaluation (NDE) nationallicence Testing mechanism nationallicence Concave defect nationallicence Bump-shaped defect nationallicence Raised signal nationallicence Sunken signal nationallicence Sun Yanhua School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut Feng Bo School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut Liu Shiwei School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut Ye Zhijian School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut Chen Shaobo School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut Kang Yihua School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/3(2015-09-01), 1-9 0195-9298 34:3<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0293-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0293-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sun Yanhua School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Feng Bo School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Liu Shiwei School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Ye Zhijian School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Chen Shaobo School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Kang Yihua School of Mechanical Science & Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/3(2015-09-01), 1-9 0195-9298 34:3<1 2015 34 10921