Integral representation of voltage in half-plane conductor with embedded crack by D.C. potential difference method

2013 ◽  
Author(s):  
Sasamoto Akira ◽  
P. A. Krutitskii
Keyword(s):  
Integral Representation ◽  
Half Plane ◽  
Difference Method ◽  
Potential Difference ◽  
Embedded Crack

Observations of earthquake waves by the vertical earth potential difference method

1997 ◽  
Vol 101 (1-2) ◽  
pp. 157-161 ◽  
Author(s):  
Nobunao Takeuchi ◽  
Noriyoshi Chubachi ◽  
Ken'Ichi Narita
Keyword(s):  
Difference Method ◽  
Potential Difference ◽  
Earth Potential

Finite Element Analysis for the Evaluation of Cracks at a Pipe-Flange Welded Part by the Direct-Current Potential Difference Method

2015 ◽  
Author(s):  
Naoya Tada ◽  
Masaki Kosaka
Keyword(s):  
Finite Element ◽  
Direct Current ◽  
Difference Method ◽  
Evaluation Method ◽  
Fatigue Cracking ◽  
Potential Difference ◽  
Piping System ◽  
Element Analysis ◽  
Non Destructive ◽  
Current Potential

The use of a flange joint is a popular method to close the end of pipes or connect pipes in manufacturing industries. As the pipes are often subjected to vibrations and cyclic bending, fatigue cracking may occur at the welded part between the pipe and flange. It is therefore important to detect and monitor the cracking in this part to ensure safety of the whole piping system. The direct-current potential difference method (DC-PDM) is known as a suitable non-destructive technique to monitor the initiation and growth of cracks and it has been applied to cracks and wall thinning on the inner surface of pipes. In this study, finite element analyses were carried out to clarify the relationship between the size and location of cracks at the pipe-flange welded part and the potential difference. An evaluation method of circumferential crack length angle by DC-PDM was proposed.

Evaluation of Tensile and Bending Damages of CFRP Laminates by DC Potential Difference Method

2020 ◽  
Vol 2020.58 (0) ◽  
pp. 02c1
Author(s):  
Kazuma SATO ◽  
Naoya TADA ◽  
Takeshi UEMORI ◽  
Junji SAKAMOTO ◽  
Shohei KOMOTO ◽  
...  
Keyword(s):  
Difference Method ◽  
Potential Difference ◽  
Cfrp Laminates ◽  
Dc Potential
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