Journal Published Online: 01 May 2002
Volume 30, Issue 3

Dynamic Loading Fracture Tests of Ferritic Steel Using the Direct Current Potential Drop Method



To apply the leak-before-break concept to nuclear piping, the dynamic strain aging of low alloy steel materials has to be considered. For this goal, J-R tests are needed over a range of temperatures and loading rates, including rapid dynamic loading conditions. In dynamic J-R tests, the unloading compliance method cannot be applied and usually the direct current potential drop (DCPD) method is used. But, the DCPD method is known to have a problem in defining the crack initiation point due to a potential peak that arises in the early part of loading of ferromagnetic materials. In this study, the characteristics of measured DC potential peaks were investigated for SA106 Gr. C piping steels, and the definition of crack initiation point was determined by backtracking from the physically-measured final crack length. It is proposed that this technique could be applied as an improved DCPD method applicable for the dynamic loading J-R test.

Author Information

Oh, YJ
Seoul National University, Seoul, Korea
Kim, JH
Seoul National University, Seoul, Korea
Hwang, IS
Seoul National University, Seoul, Korea
Pages: 7
Price: $25.00
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Stock #: JTE12309J
ISSN: 0090-3973
DOI: 10.1520/JTE12309J