A procedure of applying the d-c potential drop technique using the closely coupled probes to NDE of a 3-D surface crack is newly developed. The calibration equation for three sensors which differ in the distance between the probes is derived. Experiments validated the use of the calibration equation for the NDE of cracks. The method to use the three sensors properly based on the measuring sensitivity is shown.

Issue Section:
Research Papers
Topics:
Nondestructive evaluation, Probes, Surface cracks, Calibration, Sensors, Fracture (Materials)
1.
Johnson
H. H.
,
1965
, “
Calibrating the Electric Potential Method for Studying Slow Crack Growth
,”
Materials Research and Standards
, Vol.
5
, No.
1
, pp.
442
–
445
.
2.
Saka
M.
,
Oouchi
A.
, and
Abe´
H.
,
1996
, “
NDE of a Crack by Using Closely Coupled Probes for DCPD Technique
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
118
, pp.
198
–
202
.
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 by The American Society of Mechanical Engineers
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