An improved DC potential drop system for crack length measurement

1993 ◽  
Vol 16 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Chow‐Shing Shin ◽  
Wen‐Han Huang ◽  
Hong‐Yie Chen
Keyword(s):  
Crack Length ◽  
Potential Drop ◽  
Length Measurement ◽  
Dc Potential ◽  
Crack Length Measurement

scholarly journals Crack Detection and Crack Length Measurement with the DC Potential Drop Method–Possibilities, Challenges and New Developments

2020 ◽  
Vol 10 (23) ◽  
pp. 8559
Author(s):  
Jürgen Bär
Keyword(s):  
Crack Length ◽  
Crack Detection ◽  
Potential Drop ◽  
General Information ◽  
Ambient Atmosphere ◽  
New Developments ◽  
Drop Method ◽  
Notched Specimens ◽  
Dc Potential ◽  
Crack Length Measurement

The direct current potential drop method (DCPDM) is widely used to determine the crack length in fatigue experiments. In practice, some special features of this method must be considered. Aside from general information on the experimental setup and calibration, some special features of the method, such as the influence of the ambient atmosphere and the application of the method to ferromagnetic materials, are presented and discussed. In addition, with the multiple potential drop measurement, a method is presented which improves the resolution of the DCPDM for detection of cracks and allows to determine crack initiation sites. The capabilities provided by this method are demonstrated on the basis of measurements undertaken on notched round bars and single edged notched specimens.

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