POTENTIAL DROP TECHNIQUE FOR NONDESTRUCTIVE EVALUATION OF BIFURCATED CRACK IN RAIL

1993 ◽  
Vol 10 (6) ◽  
pp. 333-341 ◽  
Author(s):  
M. SAKA ◽  
D. YUASA ◽  
H. ABÉ ◽  
K. SUGINO ◽  
H. KAGEYAMA
Keyword(s):  
Nondestructive Evaluation ◽  
Potential Drop ◽  
Drop Technique

NDE of a Crack by Using Closely Coupled Probes for DCPD Technique

1996 ◽  
Vol 118 (2) ◽  
pp. 198-202 ◽  
Author(s):  
M. Saka ◽  
A. Oouchi ◽  
H. Abe´
Keyword(s):  
Nondestructive Evaluation ◽  
Present Method ◽  
Current Flow ◽  
Potential Drop ◽  
Usual Method ◽  
Calibration Equation ◽  
Crack Problems ◽  
Uniform Current ◽  
Independent Integral ◽  
Drop Technique

In order to enhance the sensitivity of the d-c potential drop technique, the principle of a technique using the closely coupled probes is proposed. A calibration equation for this technique is derived, where the path-independent integral je for electric crack problems is utilized. Experiments on laboratory specimens are discussed which validate the use of the calibration equation for the nondestructive evaluation of cracks. It is shown that the sensitivity of the present method using closely coupled probes is higher than that of the usual method using a uniform current flow in the region far from the crack.

Analysis of Interaction of Multiple Cracks in a Direct Current Field and Nondestructive Evaluation

1999 ◽  
Vol 66 (2) ◽  
pp. 468-475 ◽  
Author(s):  
H. Liu ◽  
M. Saka ◽  
H. Abe' ◽  
I. Komura ◽  
H. Sakamoto
Keyword(s):  
Nondestructive Evaluation ◽  
Direct Current ◽  
Crack Depth ◽  
Three Dimensional ◽  
Potential Drop ◽  
Multiple Cracks ◽  
Current Field ◽  
Multiple Cracking ◽  
Drop Technique ◽  
Good Agreement

A method of analysis is proposed for nondestructive evaluation of multiple cracks by means of the d.c. (direct current) potential drop technique. Two and three-dimensional multiple cracks are treated. A methodology for considering interaction of cracks based on the equation for an isolated crack is given to calculate the potential drop between both sides of a crack in multiple cracking in a plate. The inverse problem to evaluate the crack depth is analyzed by comparing the potential drop calculated in this way with the measurement. It is shown that the evaluated crack depth is in good agreement with the actual one.

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.

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