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Vol.2 No.4 previous GA 16 - AA 30 - SP5 ( 31 - 32 - 33) - NT 33 - 34 - 35next Vol.3 No.2
Academic Articles
Regular Paper (Invited) Vol.3, No.1 (2011) p.39 - p.53
 

Detection and sizing of cracks using potential drop techniques based on electromagnetic induction

 
Yasumoto SATO1,* and Hoon KIM2
 
1Research Instruments Development Division, Toyota Central R&D Labs., Inc., 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan
2 School of Mechanical and Automotive Engineering, Chonnam National University, San 96-1 Dundeock, Yeosu, Chonnam, 550-747, Korea
(Received; For the use of JSM)
 
Abstract
The potential drop techniques based on electromagnetic induction are classified into induced current focused potential drop (ICFPD) technique and remotely induced current potential drop (RICPD) technique. The possibility of numerical simulation of the techniques is investigated and the applicability of these techniques to the measurement of defects in conductive materials is presented. Finite element analysis (FEA) for the RICPD measurements on the plate specimen containing back wall slits is performed and calculated results by FEA show good agreement with experimental results. Detection limit of the RICPD technique in depth of back wall slits can also be estimated by FEA. Detection and sizing of artificial defects in parent and welded materials are successfully performed by the ICFPD technique. Applicability of these techniques to detection of cracks in field components is investigated, and most of the cracks in the components investigated are successfully detected by the ICFPD and RICPD techniques.
 
Keywords
nondestructive inspection, crack, potential drop technique, induced current, finite element analysis
 
Full Paper: PDF EJAM Vol.2 pp.160-167 "Numerical Simulation of Residual Stress Measurement with Acoustic Wave"
Article Information
Article history:
Received 8 January 2011
Accepted 9 May 2011