In this paper, a novel nondestructive strategy is proposed for distinguishing differences between a stress corrosion crack (SCC) and a fatigue crack (FC) based on signals from eddy current testing (ECT). The strategy consists of measurement procedures with a special ECT probe and crack type judgment scheme based on an index parameter that is defined as the amplitude ratio of the measured signals. An ECT probe, which can induce eddy current flowing mainly in a selected direction, is proposed and applied to detect crack signals by scanning along the crack with different probe orientations. It is clear that the ratio of the amplitudes of signals detected for parallel and perpendicular probe orientations is sensitive to the microstructure of the crack, i.e., the parameter is much bigger for a fatigue crack than that of a SCC. Therefore, whether a crack is a SCC or a FC can be recognized nondestructively by comparing the index parameter with a threshold value that can be previously determined. In order to verify the validity of the proposed strategy, many artificial SCC and FC test pieces were fabricated and ECT inspections were performed to measure the corresponding crack signals. Numerical simulations were also conducted to investigate the physical principles of the new methodology. From both the numerical and experimental results, it is demonstrated that the strategy is very promising for the distinction of artificial SCC and FC; there is also good possibility that this method can be applied to natural cracks if the threshold value can be properly determined.
Skip Nav Destination
e-mail: chenzm@mail.xjtu.edu.cn
Article navigation
November 2007
Research Papers
A Nondestructive Strategy for the Distinction of Natural Fatigue and Stress Corrosion Cracks Based on Signals From Eddy Current Testing
Zhenmao Chen,
Zhenmao Chen
MOE Key Laboratory for Strength and Vibration, School of Aerospace,
e-mail: chenzm@mail.xjtu.edu.cn
Xi’an Jiaotong University
, 28 West Xianning Road, Xi’an 710049, China
Search for other works by this author on:
Ladislav Janousek,
Ladislav Janousek
International Institute of Universality
, 7F Imon Building, 2-7-17 Ikenohata, Taitou-ku, Tokyo 110-0008, Japan
Search for other works by this author on:
Noritaka Yusa,
Noritaka Yusa
International Institute of Universality
, 7F Imon Building, 2-7-17 Ikenohata, Taitou-ku, Tokyo 110-0008, Japan
Search for other works by this author on:
Kenzo Miya
Kenzo Miya
International Institute of Universality
, 7F Imon Building, 2-7-17 Ikenohata, Taitou-ku, Tokyo 110-0008, Japan
Search for other works by this author on:
Zhenmao Chen
MOE Key Laboratory for Strength and Vibration, School of Aerospace,
Xi’an Jiaotong University
, 28 West Xianning Road, Xi’an 710049, Chinae-mail: chenzm@mail.xjtu.edu.cn
Ladislav Janousek
International Institute of Universality
, 7F Imon Building, 2-7-17 Ikenohata, Taitou-ku, Tokyo 110-0008, Japan
Noritaka Yusa
International Institute of Universality
, 7F Imon Building, 2-7-17 Ikenohata, Taitou-ku, Tokyo 110-0008, Japan
Kenzo Miya
International Institute of Universality
, 7F Imon Building, 2-7-17 Ikenohata, Taitou-ku, Tokyo 110-0008, JapanJ. Pressure Vessel Technol. Nov 2007, 129(4): 719-728 (10 pages)
Published Online: September 7, 2006
Article history
Received:
May 31, 2006
Revised:
September 7, 2006
Citation
Chen, Z., Janousek, L., Yusa, N., and Miya, K. (September 7, 2006). "A Nondestructive Strategy for the Distinction of Natural Fatigue and Stress Corrosion Cracks Based on Signals From Eddy Current Testing." ASME. J. Pressure Vessel Technol. November 2007; 129(4): 719–728. https://doi.org/10.1115/1.2767365
Download citation file:
Get Email Alerts
The Behavior of Elbow Elements at Pure Bending Applications Compared to Beam and Shell Element Models
J. Pressure Vessel Technol (February 2025)
Related Articles
Eddy Current Examination of Fatigue Cracks in Inconel Welds
J. Pressure Vessel Technol (February,2007)
Detection and Sizing of Defects in Control Rod Drive Mechanism Penetrations Using Eddy Current and Ultrasonics
J. Pressure Vessel Technol (August,1996)
Detection and Characterization of Fatigue Cracks in Butt Welds of Offshore Structures Using the Eddy Current Method
ASME J Nondestructive Evaluation (May,2023)
Initial Crack Depth and POD Values Inferred From In-Service Observations of Cracks in North Sea Jackets
J. Offshore Mech. Arct. Eng (August,2000)
Related Proceedings Papers
Related Chapters
Fatigue Crack Growth, Fatigue, and Stress Corrosion Crack Growth: Section XI Evaluation
Companion Guide to the ASME Boiler & Pressure Vessel Codes, Volume 2, Sixth Edition
Fatigue Crack Growth, Fatigue, and Stress Corrosion Crack Growth: Section XI Evaluation
Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 2, Second Edition: Criteria and Commentary on Select Aspects of the Boiler & Pressure Vessel and Piping Codes
Overview of Section XI Stipulations
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 2, Third Edition