Abstract
A method for improving crack detection using scan-type magnetic flux leakage testing is proposed herein. Usually, the crack detection ability decreases when the crack length direction is parallel to the magnetization direction. We propose a gradient directional magnetization method that improves the probability of detection regardless of the direction of the sensor array, which is parallel to the magnetizer’s poles and perpendicular to the length of the crack. The effectiveness of the gradient directional magnetization method was verified using finite element method simulation and experimental tests.
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Recommended by Editor Jai Hak Park
Jungmin Kim received the Master’s degree in Control and Instrumentation Engineering from Chosun University, Gwangju, Korea, in 2010. He is currently working toward the Ph.D degree. His research interests are NDT and magnetic camera.
Jinyi Lee received the B.S. in Mechanical Design from Chonbuk University, Jeonju, Korea, in 1992. Also he received the M.S. and Ph.D in Mechanical and Aeronautics & Space Engineering from Tohoku University, Sendai, Japan, in 1995 and 1998, respectively. Since 2003, he has been an Associate Professor at Chosun University. He is the author or coauthor of many patents and scientific papers. His research interests are in application of magneto-optical film, laser and CCD line scan sensor, and development of magnetic camera.
Minhhuy Le received the B.S. in Mechatronics from Ha Noi University of Technology, Hanoi, Viet Nam, in 2009, and the M.S. in Control and Instrumentation Engineering from Chosun University, Gwangju, Korea, in 2011. He is currently working toward the Ph.D. His research interests are magnetooptical film and magnetic camera.
Jongwoo Jun received the B.S. in Electronics Engineering from Inje University, Kimhae, Korea, in 1999. He received the M.S. in Electronics Engineering from Changwon University, Changwon, Korea, in 2005. And the Ph.D in Information & Communication Engineering from Chosun University, Gwangju, Korea, in 2009. Since 2009, he has been a research professor, and is currently working toward research centre for real time NDT from Chosun University, Gwangju, Korea. His research interests are NDT and evaluation, magnetic camera.
Changhyun Cho received the B.S. and M.S. degrees in Mechanical Engineering from Kyunghee University, Korea, in 1997 and 1999, respectively. He received the Ph.D in Mechanical Engineering from Korea University, Korea, in 2005. He was with the Center for Intelligent Robotics, Frontier 21 Program at KIST from 2005 to Aug. 2008. He joined the faculty of the Dept. of Control, Instruments, and Robotics, Chosun University, Kwangju, Korea in 2008, where he has served as an Assistant Professor since 2008. His current research interests are in the fields of mechanism design and the control of robotic systems.
Ki-Su Shin graduated Korea Air force Academy with degree B.S. in Mechanical Engineering in March 1988. He then received his M.S. and Ph.D degrees from Wichita State University in 1995, United States Air Force Institute of Technology in 2004, respectively. Dr. Shin is currently a Professor at the National Defense University in Seoul, Korea. His research interests include weapon systems structural analysis, airborn weapon’s life estimation based on damage tolerance analysis.
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Kim, J., Lee, J., Le, M. et al. Improvement of crack inspection possibility using gradient directional magnetization and linearly integrated hall sensors. J Mech Sci Technol 26, 3447–3451 (2012). https://doi.org/10.1007/s12206-012-0876-7
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DOI: https://doi.org/10.1007/s12206-012-0876-7