scholarly journals Inner defect depth detection using a multifrequency alternating current potential drop technique

AIP Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 105312 ◽  
Author(s):  
Fangji Gan ◽  
Yuting Li ◽  
Zhengjun Wan ◽  
Junbi Liao
Keyword(s):  
Potential Drop ◽  
Alternating Current ◽  
Defect Depth ◽  
Drop Technique ◽  
Current Potential ◽  
Depth Detection

scholarly journals Measuring the depth of surface cracks using alternating current potential drop technique, with suppression of the influence of the electromagnetic properties of the metal

2021 ◽  
Vol 2091 (1) ◽  
pp. 012047
Author(s):  
P N Shkatov
Keyword(s):  
Crack Depth ◽  
Potential Drop ◽  
Alternating Current ◽  
Measurement Range ◽  
Electromagnetic Properties ◽  
Surface Cracks ◽  
Measuring Techniques ◽  
Drop Technique ◽  
Current Potential

Abstract Traditional measuring techniques often lead to errors due to the need to register signals in both defective and defect-free areas. In this paper, we introduce an alternating current potential drop technique with detuning from the influence of variations in the electromagnetic properties of the metal achieved by registering a signal only at the defective site. We show that, with an appropriate choice of measurement parameters, the use of the proposed technique leads to an increase in sensitivity to the crack depth as well as to an increase in the measurement range.

Influence of crack length on crack depth measurement by an alternating current potential drop technique

2010 ◽  
Vol 21 (10) ◽  
pp. 105702 ◽  
Author(s):  
Manoj K Raja ◽  
S Mahadevan ◽  
B P C Rao ◽  
S P Behera ◽  
T Jayakumar ◽  
...  
Keyword(s):  
Crack Length ◽  
Crack Depth ◽  
Potential Drop ◽  
Alternating Current ◽  
Depth Measurement ◽  
Crack Depth Measurement ◽  
Drop Technique ◽  
Current Potential

scholarly journals Multidirectional Alternating Current Potential Drop Technique for Detecting Random Cracks

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 76640-76645
Author(s):  
Wenyang Li ◽  
Fangji Gan ◽  
Shiping Zhao ◽  
Yongjie Zhou ◽  
Xiaoming He
Keyword(s):  
Potential Drop ◽  
Alternating Current ◽  
Drop Technique ◽  
Current Potential

Alternating Current Potential Drop Technique to Detect Pit-to-Crack Transition

MRS Advances ◽  
2016 ◽  
Vol 1 (17) ◽  
pp. 1241-1246
Author(s):  
Xuejun Huang ◽  
Lun Yu ◽  
Ronald Ballinger
Keyword(s):  
Crack Initiation ◽  
Potential Drop ◽  
Transition Process ◽  
Alternating Current ◽  
Localized Corrosion ◽  
Critical Transition ◽  
Total Lifetime ◽  
Crack Transition ◽  
Drop Technique ◽  
Current Potential

ABSTRACTPitting and localized corrosion can occur under various conditions and accelerate the subsequent cracking and the failure of a component. Pit-to-crack transition is considered a critical transition process and has a significant impact on the total lifetime of a component. In this study, an alternating current potential drop (ACPD) system is built and applied the detection of the pit-to-crack transition. The results show that the ACPD system is capable and sensitive to crack initiation and that the sensitivity increased with increased frequency. Crack initiation sites from pits are characterized and discussed.

General Rule of Method for Measurement of Thickness and Crack Size by Electric Potential Drop Technique: Outline of the NDIS3426:2008

2009 ◽  
Author(s):  
Yang Ju ◽  
Seiichi Hamada
Keyword(s):  
Fatigue Crack ◽  
Electric Potential ◽  
General Rule ◽  
Potential Drop ◽  
Crack Size ◽  
Pulsed Direct Current ◽  
Measurement Of Thickness ◽  
Drop Technique ◽  
Direct Current Potential Drop ◽  
Current Potential

The Japanese Society for Non-Destructive Inspection (JSNDI) published general rule of method for measurement of thickness and crack size by Electric Potential Drop Technique as the Standard of JSNDI (NDIS3426) in January, 2008. NDIS3426 was established based on the researches for many years including the round robin tests conducted as the academic activities in JSNDI, and the previous technical guideline and standard ASTM E-647-05 ANNEX A6 and BS ISO 12108:2002 established for the measurement of fatigue crack growth in specimens. In this paper, the outline and the background of NDIS3426 was described. The electric potential drop technique is one of the promising methods to monitor or measure the thickness and crack size for the practical use in many industries. For the inspection of the surface deep fatigue crack in the steam turbine casing, the advanced crack depth indicator based on the potential drop technique has been applied. For the monitoring the creep damage accumulated in the seam-welded power piping, the commercialized tool based on the pulsed direct current potential drop technique has been used. For the pipe wall thinning measurement in the operating thermal power plant, the pulsed direct current potential drop technique was applied. This paper shows the present condition of the practical use and the future prospect of the potential drop technique.

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